4B Older Practice questions Heating Flashcards
The most important rule in safe operation of boilers is to:
a. Watch the steam pressure
b. Not overheat the boiler
c. Ensure an adequate air supply
d. Ensure a fuel supply
e. Keep the correct water level
e. Keep the correct water level.
It is very important that boilers should be:
a. Warmed up quickly to prevent condensation
b. Warmed up quickly to prevent scale build-up
c. Warmed up at a rate of one degree every five minutes
d. Warmed up slowly to prevent thermal shock
e. Lit only when cool.
d. Warmed up slowly to prevent thermal shock
Before starting up a new boiler or one that has been out of service the following must be ensured:
a. The manufacturer’s recommendations are read
b. The boiler has a valid inspection certificate
c. The fuel is shut off
d. The boiler control is in the off position
e. The boiler is cold
b. The boiler has a valid inspection certificate
A gradual increase in stack temperature is an indication of:
a. Poor burner operation
b. Too much excess air
c. Unclean heating surfaces
d. Poor damper operation
e. All of the above
e. All of the above
If your low, pressure steam boiler was in service and you found that there was no water level showing in the gage glass, your first action would be to:
a. Lift the easing lever on the safety valve
b. Cut off the fuel and air to the furnace
c. Start the standby feed pump
d. Send for the Boiler Inspector
e. Call a reliable plumber
b. Cut off the fuel and air to the furnace
- During the warm up period of a heating boiler the main burner goes out. The operator should:
a. Shut down the boiler immediately purge the boiler and restart it
b. Shut down the boiler, close the fuel valves and determine the cause of the problem
c. Try to re-light the burner immediately
d. Check the altitude gage to ensure there is enough water in the system
e. Clean the burner, purge the boiler and restart it.
b. Shut down the boiler, close the fuel valves and determine the cause of the problem
If the safety relief valve on your hot water boiler was opening up, the cause could be:
- Steam collecting in the water space
- Expansion tank completely filled with water
- Faulty automatic fill valve
- Circulating pump running too slow
a. 2, 3, 4
b. 1, 3
c. 2, 3
d. 2, 4
e. 1, 2, 3.
c. 2, 3
Slight smoking during the start-up of a cold oil-fired boiler is caused by:
a. Dislodging soot from the gas passes
b. Having the initial fire too hot
c. Over purging of the furnace
d. Oil and furnace temperatures not yet up to operational parameters.
e. Under purging of the furnace
d. Oil and furnace temperatures not yet up to operational parameters.
If there is any question as to the accuracy indicated by a gage glass and the true level cannot be determined:
a. The boilers should be fired harder to raise the pressure in the glass, thus forcing out any obstruction in the connections.
b. The boiler should be removed from service and all water level indicating attachments checked.
c. More chemicals should be added to the boiler to dissolve solid obstructions.
d. The boiler should be operated at a slightly lower pressure to be safe.
e. The boiler should be shutdown, drained and inspected
b. The boiler should be removed from service and all water level indicating attachments checked
It is vitally important to slowly heat up a cold boiler to prevent:
a. Uneven heating.
b. Uneven expansion.
c. Even expansion.
d. Even heating.
e. Cavitation in the boiler feedwater pump.
b. Uneven expansion
Rust in the water gage glass is an indication that:
a. Suspended solids are high
b. Raw water is leaking into the boiler
c. The copper and brass seats of the valves are deteriorating
d. Corrosion is occurring in the system
e. Total dissolved solids in the boiler are high.
d. Corrosion is occurring in the system
When cutting in an additional boiler into the heating system the:
a. Stop valves in the supply and return lines are both closed
b. Supply valve is open slightly and the return line is closed
c. Supply and return lines are open
d. Supply and return line valves are both open slightly
e. Supply valve only is closed.
a. Stop valves in the supply and return lines are both closed
How often would you test the low, level fuel cut-off on a low, pressure steam heating boiler by blowing out the float chamber?
a. Daily
b. Monthly
c. Semi-annually
d. Annually
e. Bi-weekly.
a. Daily
Thermal shock to boilers can be reduced by:
a. Warming up boilers slowly
b. Keeping the boiler free of scale build-up
c. Covering the tube sheets with refractory
d. Not allowing full flow of cold water into a warm hot water boiler
e. All of the above
e. All of the above
Upon starting a cold gas-fired boiler water initially may leak from the reversing chambers due to:
a. The fire tubes not expanding into the tube sheets
b. A fire tube has failed
c. Combustion gasses are condensing on cold boiler surfaces
d. There is boiler water on the fire side of the fire tubes
e. The fireside was just hydro tested
c. Combustion gasses are condensing on cold boiler surfaces
The most important rule in safe operation of a steam heating boiler is:
a. Operate the burner properly
b. Keep the water level in the boiler at the proper level
c. Maintain the proper operation of automatic controls
d. Maintain the correct level in the altitude gage
e. Ensure air is kept out of the system
c. Maintain the proper operation of automatic controls
Routine testing of the low water fuel cutoff is done by:
a. Shutting down the boiler
b. Blowing down the float chamber.
c. Blowing down the boiler.
d. Blowing sown the float chamber while holding the shutdown bypass switch.
c. Blowing down the water column.
d. Blowing sown the float chamber while holding the shutdown bypass switch.
The most efficient way to keep oxygen out of the boiler water system is to:
a. Add sufficient oxygen scavenger.
b. Keep water make-up to a minimum.
c. Operate the deaerator at a higher pressure.
d. Increase boiler blowdown.
e. Maintain a higher pH balance
. Keep water make-up to a minimum.
A frequent means of heating large facilities such as factories, warehouse and garages is to use a:
a. Fin fan
b. Unit heater
c. Convector
d. Radiator
e. Space heater
b. Unit heater
A radiator valve is used to control the amount of:
a. Air leaving the radiator
b. Condensate leaving the radiator
c. Steam leaving the radiator
d. Air entering the radiator
e. Steam entering the radiator
e. Steam entering the radiator.
The purpose of the metal fins attached to the copper tubes in a convector is to:
a. Increase the steam flow
b. Protect the tubes from damages
c. Increase the heat transfer
d. Direct the heat
e. Direct the steam flow
c. Increase the heat transfer
Large areas such as warehouses are usually heated by:
a. Unit heaters
b. Radiators
c. Convectors
d. Open heaters
e. Space heaters
a. Unit heaters
The level in the condensate receiver may be automatically controlled by a:
a. Float switch
b. Pressure reducing valve
c. Gate valve
d. Drain valve
e. Sight glass.
a. Float switch
The packless radiator valve has a bronze diaphragm that completely seals off the valve body, this to prevent:
a. Air to enter into the radiator
b. Condensate collection on the valve body
c. Air leaking out around the valve stem
d. Steam leaking out around the valve stem
e. Steam pressure become excessive.
d. Steam leaking out around the valve stem
An/a _____ is used to expel air from the risers and main heaters of the steam heating system.
a. Deaerator
b. Air condenser
c. Air ejector
d. Automatic air vent
e. Air vacuum.
d. Automatic air vent
An air vent is partially filled with volatile liquid so that:
a. When hot steam surrounds cylinder, it causes the needle valve to open.
b. When relatively cool air surrounds the cylinder, it causes the needle valve to open
c. When relatively cool air surrounds the cylinder, it causes the needle valve to close
d. Steam will flow in one direction only
e. The air will flow in one direction only
b. When relatively cool air surrounds the cylinder, it causes the needle valve to open
In heating systems in large complexes such as shopping centers and schools, the resistance to the flow of condensate in the return piping of steam heating systems is quite high, therefore _____ are often used to aid in the condensate flow.
a. Vacuum ejector
b. Vacuum injector
c. Pressure controls
d. Vacuum pumps
e. Vacuum breakers
d. Vacuum pumps
Unit heaters differ from convectors in that they use _____ to increase heat transfer.
a. Metal fins
b. Natural circulation
c. Blowers
d. Copper tubes
e. Brass tubes
c. Blowers
In newer steam heating systems, the condensate discharged by the steam traps from radiators, convectors, or other heating equipment drains by gravity through the return piping to:
a. The boiler
b. A condensate tank
c. The condensate scrubber
d. The deaerator
e. The condensate separator
b. A condensate tank
Air can be removed from steam heating systems by:
a. Air vents
b. A steam trap
c. An air separator
d. An air header
e. A dip tube
a. Air vents
A radiator trap is a device that is used to:
a. Allow only air to leave the radiator
b. Vent steam from the radiator
c. Depressurize a radiator
d. Allow only steam to leave the radiator
e. Allow only water to leave the radiator.
e. Allow only water to leave the radiator
Convectors use _____ to increase heat transfer
a. Metal fins
b. Radiators
c. Blowers
d. Copper tubes
e. Brass tubes.
a. Metal fins
Radiators can be classified as:
a. Floor, window or ceiling
b. Window, duct or floor
c. Wall-hung, floor, and window
d. Legless, ductless and floor
e. Ceiling, floor, window and legless
c. Wall-hung, floor, and window
In fin coil type heater, individual room temperature is controlled by
a. Switches
b. Automatic valves
c. Dampers
d. Air relays
e. Supply ducts
c. Dampers
Hand operated pet cocks on heating systems used for expelling air have been superceded by:
a. Steam traps
b. Diverters
c. Automatic air vents
d. Check valves
e. Pipe siphons
c. Automatic air vents
The purpose of a radiator trap is to:
a. Stop the flow of steam
b. Assist circulation within the radiator
c. Control the temperature of the radiator
d. Enable the radiator to be isolated
e. Pass condensate and retain steam in the radiator
e. Pass condensate and retain steam in the radiator
Unit ventilators are:
a. Ceiling suspended unit heaters
b. Baseboard type heaters
c. Cabinet type heaters
d. Ceiling mounted unit heaters
e. Floor radiators.
c. Cabinet type heaters
The radiator trap is a device that allows:
a. Debris to collect
b. Steam to collect
c. Water and steam to collect
d. Steam to be discharged but prevents water from discharging
e. Water to be discharged but prevents steam from discharging
e. Water to be discharged but prevents steam from discharging.
Radiators are usually made of:
a. Steel
b. Cast iron
c. Stainless steel
d. Copper
e. Brass.
b. Cast iron
When air is forced through a heating coil where the fan and coil are within the same unit, the unit is known as:
a. A unit heater
b. An injector
c. A diverter
d. An air vent
e. A convector
a. A unit heater
Push nipples are:
a. Devices used to connect radiator sections together
b. Air release devices on radiators
c. Used to connect pipes together in a heating system
d. A connection used for pressure gauges
e. Greasing devices for furnace fans.
a. Devices used to connect radiator sections together
One of the main considerations in the construction of radiators suitable for steam heating systems is:
a. Large heating surface area
b. Small heating surface area
c. Attractiveness
d. Modern in appearance
e. Light weight.
a. Large heating surface area
The purpose of a radiator trap is to:
a. Control steam flow into the radiator
b. Control steam flow leaving the radiator
c. Drain condensate from the radiator
d. Remove the air from the radiator
e. Trap the radiant heat in the system
c. Drain condensate from the radiator
Unit ventilators use:
a. Only outside air for heating
b. Only inside air for heating
c. Natural draft
d. A mixture of inside and outside air for heating
e. Fin coil heaters.
d. A mixture of inside and outside air for heating
The difference between a convector and a radiator is:
a. The way they transfer heat
b. The way the heating medium goes through
c. The method of control
d. That one is made of cast iron and the other of steel or copper
e. The way the heating and cooling is distributed.
d. That one is made of cast iron and the other of steel or copper
Radiators and convectors should be placed:
a. Against inside walls
b. Closed to the boiler
c. In a central location
d. In an enclosed area and away from windows
e. Against outside walls and preferably under windows.
e. Against outside walls and preferably under windows
Another name for a unit ventilator is:
a. Radiator
b. Exhauster
c. Convector
d. Register
e. Univent.
e. Univent
Air vents are used to:
a. Trap excess air
b. Expel the air from heating systems
c. Trap volatile liquids
d. Expel impurities from boilers
e. Expel the moisture from heating systems.
b. Expel the air from heating systems
The vacuum pump performs the following function:
a. Supplies water to the condensate receiver
b. Supplies steam to the boiler
c. Returns the condensate (water) back to the boiler
d. Returns the steam to the condensate receiver
e. None of the above.
c. Returns the condensate (water) back to the boiler
The piping and heating units of a steam heating system must be so arranged that the:
a. Condensate can be circulated back to the heating units
b. Steam can flow freely from the heating units and returned to the boiler
c. Air can be expelled from the heating units and piping
d. Air can be kept on top of the heating units
e. Condensate can flow freely to the heating units
c. Air can be expelled from the heating units and piping
In all systems, the horizontal steam supply pipes between boiler and heating units are called the:
a. Mains
b. Risers
c. Banks
d. Racks
e. Downcomers
a. Mains
Finned convectors should be kept free of:
a. Air
b. Steam
c. Corrosion
d. Dust
e. All of the above
d. Dust
The Hartford Loop prevents the water in the boiler from:
a. Exceeding the maximum temperature
b. Exceeding the highest safe level
c. Dropping below a safe level
d. Contamination by impurities in the returning condensate
e. Flowing out through the steam main
c. Dropping below a safe level
In a gravity return system, the boiler should be placed:
a. Well above the highest radiator
b. Well below the lowest radiator
c. On an elevated platform
d. At the same level as the radiators
e. In a central location.
b. Well below the lowest radiator
Which one of the following steam heating systems can be used to overcome the difficulty of returning condensate back to the boiler due to inefficient static head?
a. One pipe, gravity return system
b. Two pipe, gravity return system
c. One pipe, free flow return system
d. Two pipe, return trap system
e. Two pipe, free drain return system
d. Two pipe, return trap system
A pressure balancing device that prevents the boiler pressure from forcing the water in the boiler into the return lines is called a:
a. Relief valve
b. Check valve
c. Pipe siphon
d. Pressure reducing valve
e. Hartford loop.
e. Hartford loop
In the two, pipe variable vacuum steam heating system, the steam temperature can be varied from:
a. 200°C to as low as 100°C
b. 150°C to as low as 100°C
c. 150°C to as low as 55°C
d. 105°C to as low as 55°C
e. 105°C to as low as 45°C.
d. 105°C to as low as 55°C
Which of the following would you expect to find in a steam heating system?
- Convectors
- Return traps
- Condensate tank
- Cushion tank
a. 1, 2, 3
b. 2, 3, 4
c. 1, 2, 4
d. 1, 3, 4
e. 1, 2, 3, 4.
a. 1, 2, 3
- When starting up a steam heating boiler, it should be filled to:
a. The maximum level
b. 3/4 of the gauge glass
c. 1/2 of the gauge glass
d. 1/4 of the gauge glass
e. The very bottom of the gauge glass
c. 1/2 of the gauge glass
After a steam heating system has been operating for some time, you notice that some sections of the system are still cold. Which one of the following could be the cause of this?
a. Air is trapped in the affected sections
b. Boiler water pressure too low
c. Boiler water temperature too low
d. Steam does not contain enough heat
e. Condensate temperature too low
a. Air is trapped in the affected sections
The piping and heating units of a steam heating system must be so arranged that:
a. The condensate can flow freely to the heating units
b. The air can be kept at the top of the heating units
c. Steam can flow freely to all heating units
d. All of the above.
e. None of the above.
c. Steam can flow freely to all heating units
When the return main of a gravity return steam heating system is located below the level of the water line in the boiler, it is called:
a. Flooded return
b. Dry return
c. Wet return
d. Upfeed return
e. Downfeed return
c. Wet return
When a single main is used to carry both the steam supply from the boiler to the radiators and the steam condensate from the radiators back to the boiler, the system is called a one pipe:
a. Condensate return system
b. Gravity return system
c. Return trap system
d. Vacuum pump system
e. Variable vacuum system
b. Gravity return system
- The two pipe gravity return steam heating system, now obsolete, had the disadvantage that during startup, some steam could pass through a radiator without condensing and could enter other radiators via the return main, thus trapping:
a. Water in the center
b. Steam in the center
c. Condensate in the center
d. Debris in the center
e. Air in the center.
e. Air in the center.
If the water level falls too low during operation of a steam heating boiler, the operator should:
a. Tell his or her supervisor
b. Add more water immediately
c. Lower the flame and add water to bring it up to a safe level
d. Shut the boiler down
e. Operate the safety valve.
d. Shut the boiler down
- In the case of radiators and convectors, the main sources of trouble are the:
a. Air vents
b. Air traps
c. Push nipples
d. Connecting rods
e. Valves and traps
e. Valves and traps.
Slow or insufficient heat in one or more rooms in a steam, heated building can be caused by a faulty:
a. Steam trap
b. Float switch
c. Heater
d. Vacuum switch
e. Sight glass
a. Steam trap
Slow or insufficient heat throughout a building heated by steam can be caused by:
a. Too high a firing rate
b. Too low a firing rate
c. Air leaks
d. The feedwater being too cold
e. Oversized piping
b. Too low a firing rate
All supply and drain lines of a steam heating system must be pitched to:
a. Allow for drainage of condensate
b. Allow collection of air at the highest points
c. Prevent corrosion
d. Allow for temperature expansion
e. All of the above
a. Allow for drainage of condensate
A _____ for a steam heating system will reduce the possibility of heating problems occurring when the system is in service.
a. Heat monitor
b. Thermostatic controller
c. High capacity boiler
d. Air/fuel controller
e. Good preventative maintenance program
e. Good preventative maintenance program
In a hot water system compared to a steam heating system, if there is a leak, damage will:
a. Be greater in the steam system
b. Be greater in the hot water system
c. Be about the same in either system
d. Depend on where the boiler is located in the system
e. Be minimal due to the automatic drain system.
b. Be greater in the hot water system
In a radiant panel heating system, changes are:
a. Difficult to make
b. Easy to make
c. As easy to make as in any other heating system
d. Dependent on availability of materials
e. Dependent on location
a. Difficult to make
Because of the different circuit lengths to each convector, the direct return hot water system is difficult to:
a. Construct
b. Circulate water
c. Return water to the boiler
d. Balance
e. Maintain heat
d. Balance
A hot water boiler of the same output is:
a. Larger than a steam boiler
b. Smaller than a steam boiler
c. The same size as a steam boiler
d. Taller than a steam boiler
e. Shorter than a steam boiler
b. Smaller than a steam boiler
In a one pipe hot water system, the fitting that directs the water to each converter is called the:
a. Diverter
b. Trap
c. Vent valve
d. Separator
e. Lead.
a. Diverter
Which of the following use a boiler in the heating system?
- Steam heating
- Electric heating
- Steam to hot water system
- Hot water heating system
a. 1, 2
b. 2, 3
c. 1, 4
d. 3, 4
e. 1, 3, 4.
e. 1, 3, 4.
A hot water system which circulates water through the pipes with a pump is known as a:
a. Circulating system
b. Forced system
c. Pumped system
d. Gravity system
e. Return system.
b. Forced system
One of the disadvantages of the gravity hot water system is:
a. The water temperature must be very high to compensate for heat losses
b. Piping used must be rated for high temperature services
c. There is a slow response to changes in heat demand
d. The maximum water temperature is limited to approximately 100°C
e. High maintenance.
c. There is a slow response to changes in heat demand
One of the advantages of the hot water heating as compared to steam heating is:
a. More piping is needed
b. Hot water boilers are more fuel efficient
c. Lower maintenance cost
d. Water treatment is almost eliminated
e. Less damage for leakage.
c. Lower maintenance cost
A hot water heating system is also known as a _____ heating system.
a. Warm air
b. Circulation
c. Loop
d. Hydronic
e. Radiant panel
d. Hydronic
Automatic snow melting systems can use:
a. Hot water and antifreeze mixed
b. Electric resistance heating
c. Infrared lamps mounted above sidewalks and ramps
d. Hot water and ethylene glycol mixed
e. All of the above.
e. All of the above.
The two pipe reverse return hot water heating system has the advantage of:
a. All circuits have the same length
b. Low cost
c. No circulating is needed
d. Elimination of an expansion tank
e. Elimination of air vents
a. All circuits have the same length
Advantages of the forced circulation hot water heating systems are:
a. Reduction in pipe size and greater heat storage capacity
b. High pressure piping and controls
c. High vacuum in the return lines and pump
d. Higher make-up and better chemical control
e. Low water make-up and better chemical control.
a. Reduction in pipe size and greater heat storage capacity
Snow melting systems are usually filled with:
a. Water only
b. Methanol and water
c. Ethylene glycol and water
d. Steam
e. Warm air.
c. Ethylene glycol and water
In a forced circulation system, the closed expansion tank allows the system to operate at:
a. A vacuum
b. A pressure well above atmospheric pressure
c. Pressures above sea level
d. The lower floors
e. Absolute pressures
b. A pressure well above atmospheric pressure
The disadvantage of a loop hot water heating system is:
a. High cost piping system
b. High water consumption
c. High fuel consumption
d. Individual convectors cannot be shut off
e. Temperature of the system too high
d. Individual convectors cannot be shut off
The system which allows the highest water temperature is the:
a. Oil fired system
b. Gas fired system
c. Closed expansion tank system
d. Open expansion tank system
e. Steam to hot water converter system.
c. Closed expansion tank system
The advantage of radiant panel heating is:
a. A more even heat distribution throughout rooms
b. More comfort on feet when floors are heated
c. That the heating elements are out of sight
d. All of the above.
e. None of the above
d. All of the above.
Advantages of the high temperature hot water systems are:
a. Reduction in pipe size and greater heat storage capacity
b. Low water make-up and better temperature control
c. High vacuum in the return lines and pumps
d. Higher make-up and better chemical control
e. High-pressure piping and controls.
a. Reduction in pipe size and greater heat storage capacity
The maximum temperature of water in a gravity hot water system is:
a. 65°C
b. 70°C
c. 77°C
d. 87°C
e. 67°C.
c. 77°C
Open type expansion tanks:
a. Must be located below the heating system
b. Must be located above the heating system
c. Are used with large hot water boilers only
d. Are used with small hot water boilers only
e. Must be located indoor.
b. Must be located above the heating system
One of the advantages of the radiant panel hot water heating system over the conventional heating system is:
a. Less piping is needed
b. Low water flow resistance
c. Low in cost
d. Ease of repair of heating coils
e. Even heat distribution throughout the rooms
e. Even heat distribution throughout the rooms
In a radiant heating system, the maximum surface temperature of the walls is:
a. 10°C
b. 20°C
c. 38°C
d. 40°C
e. 50°C.
c. 38°C
In many buildings, the hot water heating system is divided into several circuits and the flow of water is controlled by:
a. A thermostat
b. A thermometer
c. A thermocouple
d. A circulating pump in each heating zone
e. An expansion tank in each heating zone.
d. A circulating pump in each heating zone
One of the advantages of the one pipe forced circulation hot water heating system is:
a. An expansion tank is not needed
b. An air separator is not needed
c. Air vents are not needed
d. A circulating pump is not required
e. It is simple in design.
e. It is simple in design
One of the advantages of the forced circulation heating systems as compared to the gravity heating systems is:
a. Large pipes can be used
b. Small pipes can be used
c. Low maintenance
d. Low cost
e. Low power consumption
b. Small pipes can be used
A forced hot water circulating system can be classified as:
a. Loop system
b. One pipe system
c. Two pipe direct return system
d. Two pipe reverse return system
e. All of the above.
e. All of the above
In multi-story buildings, where there would be excessive head on a hot water boiler placed in the basement. To overcome this:
a. Additional hot water boilers are used
b. Combination of steam and hot water boilers are used
c. Larger hot water boilers are used
d. Condensate pumps are used
e. Steam to hot water converters are used
e. Steam to hot water converters are used.
When comparing antifreeze to water which of the following are true:
- It is heavier than water 2. It carries more heat than water 3. It will expand more than water when heated 4. Higher cost than water
a. 1, 2, 3
b. 2, 3, 4
c. 1, 3, 4
d. 1, 2, 4
e. 1, 2, 3, 4.
c. 1, 3, 4
The purpose of a pressure, reducing valve is to:
a. Level out the flow of steam or hot water
b. Automatically reduce pressure and maintain it
c. Reduce water hammer in a heating system
d. Maintain hot water at a required pressure
e. To reduce the feedwater pressure to the boiler
b. Automatically reduce pressure and maintain it
Which type of heating system would you expect to find in a high rise office building?
- Gravity warm air circulation
- Forced hot water circulation
- Gravity hot water circulation
- Steam to hot water heating system
a. 1, 3
b. 2, 3, 4
c. 2, 3
d. 1, 2, 3
e. 2, 4.
e. 2, 4.
The pump used to provide forced circulation in hot water heating systems are usually the electrically driven:
a. Centrifugal type
b. Rotary type
c. Piston type
d. Sliding vanes type
e. Multi-stage type.
a. Centrifugal type
Air tends to collects in the high spots of piping and heating units in hot water heating systems, and this could:
a. Increase the temperature of the system
b. Increase the velocity of the water flow
c. Restrict the flow of water
d. Restrict the airflow
e. Decrease the efficiency of the expansion tank
c. Restrict the flow of water
Air is removed from a hot water system by which of the following:
- Air vents
- Deaerators
- Air condensers
- Air separators
a. 1, 2
b. 2, 3
c. 1, 4
d. 2, 4
e. 1, 3.
c. 1, 4
A/an _____ is used to prevent excessive pressure build-up due to the expansion caused by heating of the water in a hot water heating system.
a. Air vent
b. Expansion tank
c. Pressure reducing valve
d. Pressure relief valve
e. Low pressure fuel cut-off device.
b. Expansion tank
When filling a hot water system prior to putting it into service, it is most important to:
a. Close all valves and fill the system quickly
b. Purge the boiler
c. Remove the safety valve
d. Vent all air
e. Check the gage glass on the boiler
d. Vent all air
To prevent corrosion in the expansion tank it is sometimes filled with:
a. Nitrogen
b. Air
c. Oxygen
d. Helium
e. Hydrogen.
a. Nitrogen
Diverter fittings are used in the supply lines to heating units when:
a. Compensating for a low heating load
b. A higher heating output is required from the heating unit
c. The distance from boiler to heating unit is short
d. There are no balancing valves installed in the supply line
e. A hydraulic balance must be corrected
b. A higher heating output is required from the heating unit
A positive pressure should be maintained in a hot water heating system in order to avoid:
a. Air being drawn into the system
b. Water from leaking out of the system
c. Setting off the relief valve
d. The system pressure declining
e. The water level from overflowing
a. Air being drawn into the system
Which of the following would you expect to find in a hot water heating system?
- Convectors
- Expansion tank
- Circulating pump
- Automatic fill valve
a. 1, 2, 4
b. 2, 3, 4
c. 1, 2, 3
d. 1, 3, 4
e. 1, 2, 3, 4.
e. 1, 2, 3, 4.
Excessive pressure build-up due to a rise in temperature and the resulting expansion of the water in the system is prevented by the use of:
a. A float tank
b. A relief valve
c. An expansion tank
d. A cushion valve
e. A safety valve.
c. An expansion tank
To regulate the flow of water to a zone circuit a:
a. Flow control valve is used
b. Diverter fitting is used
c. Gate valve is used
d. Pressure-reducing valve is used
e. Balancing valve is used
e. Balancing valve is used
An air separator should always be installed in:
a. A horizontal pipe
b. A cross tee
c. A vertical pipe
d. An expansion tank
e. A converter
a. A horizontal pipe
The minimum reading on an altitude gauge of a boiler in a large plant is from the top of the boiler to the highest point in the system plus.
a. 0.6 m
b. 0.8 m
c. 1.0 m
d. 1.2 m
e. 1.4 m.
d. 1.2 m
The expansion tank is normally attached to the:
a. Boiler or the hot water supply line near the boiler
b. Highest point in the system directly above the boiler
c. Supply line after the circulating pump
d. Supply line above the lowest convector
e. Return line directly before the boiler
a. Boiler or the hot water supply line near the boiler
Circulating pumps used in hot water heating systems are usually:
a. Reciprocating pumps
b. Gear type pumps
c. Rotary pumps
d. Centrifugal pumps
e. Regenerative pumps
d. Centrifugal pumps
Converters in a building heating system convert:
a. Steam to superheated steam
b. Water to steam
c. Convection currents to radiation
d. The heat in steam to heat hot water
e. The steam to water for heating
d. The heat in steam to heat hot water
Improper location of the circulation pump and expansion tank can cause:
a. The circulating pump to cavitate
b. Some points in the system to be under negative pressure
c. Air to be drawn into the system
d. Vapor bubbles to form in the circulating pump
e. All of the above.
e. All of the above
A/an _____ valve is need to keep a hot water heating system with a closed expansion tank automatically filled and under proper pressure.
a. Flood
b. Pressure relief
c. Expansion
d. Pressure reducing
e. Auto flood.
d. Pressure reducing
_____ valves are necessary in each circuit of multi-zone system to prevent continued circulation of hot water after the circulator has been stopped by the zone control.
a. Multi-inlet
b. By-pass
c. Air separator
d. Balance
e. Flow control
e. Flow control.
When a closed type expansion tank on a hot water boiler is completely filled with water and the water in the system is raised in temperature so that is expands, the result will be that the:
a. Boiler expands
b. Pressure builds up, lifting the safety relief valve
c. Heating system becomes noisy
d. Circulating pump stops
e. Expansion tank will expand.
b. Pressure builds up, lifting the safety relief valve
When steam for heating purposes is taken from a high pressure main, a _____ must be used to feed steam into the heating system so that the pressure in the system will remain constant.
a. Steam injector
b. Reducing valve
c. Diverter
d. Compressor
e. Hartford loop
b. Reducing valve
Special diverter fittings are required in the one-pipe hot water systems to:
a. Divert air from each convector
b. Ensure condensate flow to the boiler
c. Divert water from the condensate tank to the boiler
d. Ensure an adequate flow of water through each convector
e. Divert airflow from the boiler to the expansion tank
d. Ensure an adequate flow of water through each convector
Steam converters are used in hot water heating systems to:
a. Transfer heat contained in the steam to the water
b. Change the direction in which the water is flowing as it cools down
c. Change condensate back to steam
d. Reduce the pressure in the expansion tank
e. To replace the steam boiler.
a. Transfer heat contained in the steam to the water
The air released from the water in the closed expansion tank type hot water heating system is directed to the:
a. Relief valve
b. Boiler
c. Radiator vents
d. Expansion tank
e. Atmosphere
d. Expansion tank
Valves in heating systems should be _____ if they do not shut off tightly.
a. Discarded
b. Heated
c. Bypassed
d. Repaired
e. Reported.
d. Repaired
What type of boiler would you expect to find in a hot water system, incorporating a converter?
a. Hot water boiler
b. Steam boiler
c. Forced circulation boiler
d. Reverse flow boiler
e. Once through boiler
b. Steam boiler
A closed type expansion tank in a hot water heating system must:
a. Be full of water at all times
b. Have a vent open to the atmosphere at all times
c. Be located 3 m. above the boiler
d. Be located no higher than the top of the boiler
e. Be partially filled with air at all times.
e. Be partially filled with air at all times
The temperature control on a steam to hot water converter, controls the:
a. Pump speed
b. Steam temperature
c. Water flow
d. Steam control valve
e. Firing rate.
d. Steam control valve
The purpose of an expansion tank is to:
a. Store heat while the boiler is firing
b. Allow for the expansion of water in the system
c. Prevent the system from overflowing
d. To prevent the water in the system from freezing
e. To prevent water lock in the system.
b. Allow for the expansion of water in the system
The air in a hot water heating system removed by the air separator is vented to the:
a. Air space at the top of the boiler
b. Nearest convector
c. Dip tube
d. Expansion tank
e. Relief valve
d. Expansion tank
In the _____ warm air heating systems, the furnace is a self-enclosed appliance that circulates air by a blower through a heat exchanger where it receives heat produced by the combustion of oil and gas. However, the circulating air is not in direct contact with the product of combustion.
a. Indirectly-fired
b. Directly-fired
c. Electric resistance coil
d. High voltage coil
e. Fin-coil heat exchanger
b. Directly-fired
When the primary source of heat is steam or hydronic a fin-coil heat exchanger supplied with hot water or steam from the boiler is used to:
a. Heat air in the secondary warm air heating system.
b. Heat air in the primary warm air heating system.
c. Increase the air temperature in an electric resistance coil heating system.
d. Reheat the steam in the secondary heating system.
e. Reheat the hot water in the primary heating system
a. Heat air in the secondary warm air heating system
One of the disadvantages of the forced warm air heating systems is the:
a. Installation and maintenance costs are higher than the steam heating systems
b. Air contains too much moisture
c. System can be quite noisy as compared to the gravity warm air heating systems
d. Poor air circulation
e. High cost for the system due to specialty equipment required.
c. System can be quite noisy as compared to the gravity warm air heating systems
The power supply for an electric resistance coil furnace is:
a. 60 V
b. 120 V
c. 240 V
d. 220 V
e. 480 V.
c. 240 V
One of the biggest heat losses in the warm air furnaces and space heaters is:
a. In the combustion chamber
b. The flue gases
c. Poor combustion design
d. High combustion air temperature
e. Poor air/fuel mixtures
b. The flue gases
Various types of heat sources are used in warm air heating systems. They can be divided into the following classes:
- Indirectly-fired 2. Directly fired 3. Electric resistance coil 4. High voltage coil 5. Fin-coil heat exchanger
a. 1, 2, 3
b. 2, 3, 4
c. 3, 4, 5
d. 1, 3, 4
e. 2, 3, 5.
e. 2, 3, 5.
Lowboy furnaces are just over _____ in height:
a. 1.0 m
b. 0.8 m
c. 1.4 m
d. 1.6 m
e. 1.2 m.
e. 1.2 m.
The advantage of having duct furnaces instead of a large central furnace is:
a. Less initial cost
b. Easier installation
c. Better control of heat in each zone of the building
d. Requires less space
e. Lower maintenance costs.
c. Better control of heat in each zone of the building
In a fin-coil heat exchanger, the primary source of heat for the exchanger is:
a. Steam or hot water
b. Gas
c. Oil
d. Solar
e. Radiant
a. Steam or hot water
Forced warm air heating systems, as compared to steam or hot water heating systems, are used more extensively to heat residences, small commercial buildings, shops, and stores since:
a. It is very portable
b. There is no maintenance required
c. It does not require duct work
d. Installation and maintenance costs are lower
e. It is very quiet in operation
d. Installation and maintenance costs are lower
In a warm air heating system, the cold air return registers are located:
a. In exterior walls
b. In interior locations
c. Under windows
d. In floors
e. In ceilings
b. In interior locations
The major disadvantage of an electric resistance coil furnace for warm air heating is the:
a. High cost of electricity
b. Danger from electric shock
c. High cost of maintenance
d. Large size of the furnace
e. Location of electrical wiring
a. High cost of electricity
One of the advantages the forced warm air heating systems has over the steam or hot water heating systems is:
a. Its ease of installation of duct works
b. The air can be humidified
c. The systems are maintenance free
d. The systems are virtually noise free
e. The systems do not require electricity
b. The air can be humidified
A fired heater which is installed on location where the heat is needed and heats the air directly without the use of any ducting is called a:
a. Unit heater
b. Unit ventilator
c. Convector
d. Fin-coil heat exchanger
e. Space heater.
e. Space heater
In a high efficiency furnace or heater the temperature of the flue gases are _____ in the secondary heat exchanger.
a. Very high
b. Very low
c. Above the dew point
d. Below the dew point
e. On the dew point.
d. Below the dew point
A type of directly fired space heater is:
a. A unit heater
b. A floor furnace
c. A wall furnace
d. All of the above.
e. None of the above
d. All of the above
High efficiency furnaces and heaters range in annual fuel utilization efficiency (AFUE) from:
a. 94 - 98%
b. 80 - 95%
c. 70 - 75%
d. 60 - 70%
e. 50 - 60%.
b. 80 - 95%
Electric resistance coil heating systems are mainly restricted to use in:
a. Large buildings
b. Large warehouses
c. Small residences
d. Steam heating systems
e. Hot water heating systems.
c. Small residences
In high efficiency furnaces, if the temperature of the flue gas drops below 65°C, the:
a. Flue gas will condense
b. Water vapor will condense
c. Furnace burner will shut down
d. Furnace burner will start up
e. Furnace vent will close.
b. Water vapor will condense
In a pulse combination furnace, the stated efficiency is:
a. 94 - 98%
b. 80 - 95%
c. 70 - 75%
d. 60 - 70%
e. 50 - 60%.
a. 94 - 98%
Which of the following are the most common types of fuels used in the furnace for the warm air heating systems?
- Coal 2. Gas 3. Oil 4. Hog fuel
a. 1, 2
b. 1, 3
c. 2, 4
d. 2, 3
e. 1, 4.
d. 2, 3
A centrifugal blower driven by a/an _____ is the most common method used to draw fresh and/or return air via the filter and to force it through the heat exchange passageways and supply ducts in a typical warm air heating system.
a. Electric motor
b. Internal combustion engine
c. Steam turbine
d. Gas turbine
e. Steam engine
a. Electric motor
The sealed ball bearings used on a blower in the warm air heating systems:
a. Require regular lubrication
b. Should be replaced every ten years of continuous service
c. Should be dismantled every two years for maintenance
d. Should be dismantled every five years for maintenance
e. Require no lubrication.
e. Require no lubrication.
Most warm air heating furnaces are often equipped with a _____ to supply moisture to the air during the dry winter season.
a. Dehumidifier
b. Humidifier
c. Water sprayer
d. Steamer
e. Vaporizer.
b. Humidifier
Fan belts should be checked regularly. When they show signs of fraying, cracking, and wear, they should be:
a. Repaired
b. Replaced
c. Reported
d. Recorded
e. Realigned
b. Replaced
The perimeter loop system of furnace ducting is ideal for a building with:
a. No insulation in the walls
b. Concrete walls
c. No basement
d. Low headroom in the basement
e. No cold air returns.
c. No basement
The warm air outlets in a warm air heating system should always be located along the:
a. Inside walls of the rooms at or near the floor level and preferably under the windows
b. Outside walls of the rooms on or near the ceiling and preferably under the windows
c. Inside walls of the rooms on or near the ceiling and preferably above the windows
d. Outside walls of the rooms at or near the floor level and preferably under the windows
e. Top corners of the rooms and preferably away from the windows.
d. Outside walls of the rooms at or near the floor level and preferably under the windows
Which of the following is the most common type of warm air outlets used in a house?
a. Ceiling diffusers
b. Wall diffusers
c. Perforated panels
d. Wall registers
e. Floor registers
e. Floor registers
Air filters can be divided into two groups:
a. Mechanical and rotating drum
b. Electronic and steam
c. Dry and wet
d. Steam and rotating drum
e. Mechanical and electronic
e. Mechanical and electronic
An electronic filter is also known as:
a. Positively charged
b. Negatively charged
c. Static filters
d. Dynamic filters
e. Electrostatic filters
e. Electrostatic filters
Heat exchangers in gas, fired furnaces are made of:
a. Brass
b. Copper
c. Aluminum
d. Steel
e. Cast iron
d. Steel
Insufficient heat throughout a building is likely caused by:
a. Too high an air, flow
b. Insufficient heat input
c. Poorly insulated ducting
d. A missing filter
e. Poor humidity control
b. Insufficient heat input
In a warm air heating system, the heated air should enter the rooms preferably via the:
a. High wall registers on inside wall
b. Baseboard registers on inside wall
c. Baseboard registers on outside wall
d. High wall registers on outside wall
e. Unit heaters on outside wall
c. Baseboard registers on outside wall
Mechanical air filters will remove:
a. All particles in the air
b. Fine particles in the air
c. Smoke in the air
d. Odor in the air
e. Coarse dust in the air
e. Coarse dust in the air.
Which of the following is a type of outlet in a warm air heating system?
a. A grill
b. A register
c. A ceiling diffuser
d. A perforated panel
e. All of the above
e. All of the above.
Supply outlets should always be located:
a. In walls
b. In floors
c. In ceiling
d. To best prevent cold drafts
e. In baseboards.
d. To best prevent cold drafts
Sleeve bearings on furnace fans require:
a. No lubrication
b. Grease every six months
c. A few drops of oil every six months
d. A few drops of oil monthly
e. Fluid lubrication
c. A few drops of oil every six months
Furnace heat exchangers should be checked for corrosion because:
a. Carbon monoxide could leak into the building
b. The holes reduce the furnace efficiency
c. Cold air could leak into the building
d. The air will become too dry for comfortable heating
e. Too much air would enter the furnace
a. Carbon monoxide could leak into the building
Plugged _____ on warm air heating and ventilating systems limit the air, flow and result in insufficient heating and a waste of fuel.
a. Filters
b. Drain lines
c. Diverters
d. Univents
e. Convectors.
a. Filters
The operation of the blower of a forced warm air heating system is controlled by the:
a. Room temperature
b. Temperature sensor in the warm air plenum
c. Furnace temperature
d. Pneumatically controlled dampers
e. Computer in the control system.
b. Temperature sensor in the warm air plenum
Electronic filters will remove:
a. All particles from the air
b. Fine particles from the air
c. Odor producing gases from the air
d. Smoke from clothes
e. All of the above
b. Fine particles from the air
Rooms that are stuffy and dry are created by:
a. Poor air distribution
b. A low supply air temperature
c. Too much ventilation air
d. Poorly insulated ducts
e. Lack of ventilation.
e. Lack of ventilation
Proper ventilation in a building is required to:
a. Give proper lighting
b. Prevent air circulation
c. Increase the humidity
d. Reduce air flow
e. Prevent condensation on walls
e. Prevent condensation on walls
Which of the following are the contaminants suspended in the air?
- Dust 2. Smoke 3. Fumes 4. Insects 5. Moisture
a. 1, 2, 5
b. 1, 3, 5
c. 2, 3, 5
d. 3, 4, 5
e. 1, 2, 3, 4.
e. 1, 2, 3, 4.
The activated carbon used for absorbing odors can be sometimes reactivated by:
a. Heating
b. Cooling
c. Charged with positive ions
d. Charged with negative ions
e. Washing with water.
a. Heating
Electronic air cleaners are divided into two of the following classes:
- Electrical centrifuge 2. Electrostatic precipitators 3. Electrode - mechanical 4. Charged-media electronic air cleaners
a. 1, 2
b. 3, 4
c. 1, 3
d. 2, 4
e. 1, 4.
d. 2, 4
Which one of the following air cleaning devices can be used for the removal of gases and vapor?
a. Dry filters
b. Air washers
c. Electronic air cleaners
d. Charcoal absorbers
e. Activated alumina chemisorbent media.
d. Charcoal absorbers
Mechanical ventilation can be divided into which types?
a. Natural air intake, mechanical exhaust
b. Mechanical air intake, natural exhaust
c. Mechanical air intake, mechanical exhaust
d. All of the above
e. None of the above.
d. All of the above
The advantage of a mechanical ventilation system is:
a. The system required no electrical power.
b. The system supplies a controlled amount of filtered and heated air.
c. The entire system only required one fan.
d. The system generates its own heat.
e. There are no duct works required
b. The system supplies a controlled amount of filtered and heated air.
Ultraviolet light is used to remove _____ from the air.
a. Dust and pollen
b. Fine dust and smoke
c. Bacteria and spores
d. Mists and fogs
e. Lint.
c. Bacteria and spores
Natural ventilation is improved by the use of a roof:
a. Ventilator
b. Radiator
c. Grille
d. Louver
e. Panel
a. Ventilator
Ventilation can be divided into two basic methods:
a. Forced and natural
b. Mechanical and natural
c. Forced and mechanical
d. Natural and warmed air
e. Natural and cold air
b. Mechanical and natural
The disadvantage of a natural air intake, mechanical exhaust ventilation system is the intake air:
a. Is heated
b. Volume is too large
c. Volume is too low
d. Is neither filtered or heated
e. Has too much moisture.
d. Is neither filtered or heated
One of the advantages of a common exhaust duct system used for ventilation in a large building is:
a. Low maintenance (no fan)
b. High output power
c. Ease of maintenance (only one fan is used)
d. Windows can be eliminated
e. No power is required
c. Ease of maintenance (only one fan is used)
Mechanical filters can be divided into two broad classes:
a. Wet and dry
b. Rotating and stationary
c. Dry and viscous
d. Corrugated and smooth
e. Throwaway and renewable
e. Throwaway and renewable
Viscous filters are highly efficient in the removal of:
a. Fine dust, fumes, and smoke
b. Bacteria and spores
c. Cooking odors
d. Dust and pollen
e. Mists and fogs
d. Dust and pollen
Electrostatic filters are highly efficient in the removal of:
a. Dust and pollen
b. Fine dust, smoke, and fumes
c. Bacteria and spores
d. Lint
e. Mists and fogs.
b. Fine dust, smoke, and fumes
Living organisms that must be removed from the air are:
a. Insects and pollen
b. Bacteria and insects
c. Bacteria and spores
d. Pollen and spores
e. Pollen and bacteria.
c. Bacteria and spores
In a mechanical air intake, natural exhaust ventilation system, the pressure in the building is:
a. Well below atmospheric pressure
b. Slightly below atmospheric pressure
c. At atmospheric pressure
d. Slightly above atmospheric pressure
e. Well above atmospheric pressure
d. Slightly above atmospheric pressure
In the past the most popular method used to provide ventilation in a residence or small building has been by:
a. Mechanical ventilation
b. Natural ventilation
c. Electrical ventilation
d. Maximum air flow system
e. Minimum air flow system
b. Natural ventilation
Activated carbons are the most common way to absorb odors and other objectionable gases. The carbon will absorb these gases up to _____ of its own weight before it has to be replaced.
a. 10%
b. 20%
c. 30%
d. 40%
e. 50%.
b. 20%
Actual ventilation rates may vary per person from:
a. 0.5 m3/min to 0.6 m3/min
b. 0.5 m3/min to 0.75 m3/min
c. 0.2 m3/m to 1.2 m3/min
d. 0.14 m3/min to 1.5 m3/min
e. 1.0 m3/min to 1.5 m3/min.
d. 0.14 m3/min to 1.5 m3/min
Infrared heaters send out _____ energy in the form of invisible infrared waves that travel in straight lines through the air.
a. Convection
b. Conduction
c. Radiant
d. Geothermal
e. Electrical
c. Radiant
One of the advantages of gas-fired infrared heating over other types of heating systems is:
a. It can heat a large area entirely
b. No fuel handling equipment
c. No ventilation is required
d. It can provide efficient spot heating
e. It can be used efficiently as the main heating source for a household.
d. It can provide efficient spot heating
Which of the following is the equipment used for direct electric heating systems?
- Electric boilers 2. Baseboard heaters 3. Wall heaters 4. Unit heaters 5. Warm air furnaces
a. 1, 2, 3
b. 2, 3, 4
c. 3, 4, 5
d. 1, 3, 5
e. 2, 4, 5.
b. 2, 3, 4
In an open wire type, heating element, the resistance wire is made of:
a. Tungsten
b. Magnesium oxide
c. Mica
d. Steel
e. Nickel-chromium
e. Nickel-chromium.
The basic types of heating systems are:
- Steam heating
- Hot water heating
- Warm air heating
- Electric heating
a. 1, 2, 4
b. 1, 2, 3
c. 2, 3, 4
d. 1, 2, 3, 4
e. 3, 4.
d. 1, 2, 3, 4
Which of the following is the equipment used for indirect electric heating systems?
- Radiant panel heaters 2. Unit ventilators 3. Heat lamps 4. Electric boilers 5. Warm air furnaces
a. 1, 2
b. 2, 3
c. 3, 4
d. 4, 5
e. 3, 5.
d. 4, 5
Infrared heaters are used in:
a. Theaters
b. Lecture halls
c. Libraries
d. Skating rinks
e. Offices.
d. Skating rinks
Which of the following are the most commonly used electric infrared heaters?
- Low temperature catalytic heater 2. Metal sheath element 3. Internally-fired heater 4. Quartz tube heater 5. Quartz lamp
a. 1, 2, 3
b. 2, 3, 4
c. 3, 4, 5
d. 1, 3, 5
e. 2, 4, 5.
e. 2, 4, 5
Which of the following are gas-fired infrared heaters?
- Surface combustion heater 2. Vented heater 3. Quartz tube heater 4. Low temperature catalytic heater 5. Metal sheath heater
a. 1, 2, 3
b. 1, 3, 4
c. 1, 2, 4
d. 2, 3, 5
e. 1, 2, 5.
c. 1, 2, 4
In an internally fired, gas-fired infrared heater, the surface temperature is about:
a. 300°C
b. 400°C
c. 500°C
d. 600°C
e. 700°C.
b. 400°C
In an electric snow melting unit, a thermostat should be used to automatically shut the system down when the outdoor temperature is above:
a. 0°C
b. 1°C
c. 2°C
d. 3°C
e. 4°C.
c. 2°C
Infrared radiant energy is directed towards:
a. Ceilings
b. Walls
c. Windows
d. Floors
e. Doors
d. Floors
One of the advantages of electric heating over other heating systems is:
a. Low operating cost
b. No fuel storage or handling equipment
c. Ideal for large warehouses
d. High operating temperatures
e. Low operating pressures
b. No fuel storage or handling equipment
- A low temperature catalytic heater contains a layer of:
a. Metal impregnated with a catalyst
b. Wool fiber impregnated with a catalyst
c. Plastic fiber impregnated with a catalyst
d. Glass wool impregnated with a catalyst
e. Porous glass impregnated with a catalyst
d. Glass wool impregnated with a catalyst
One of the main disadvantages of electrical heating systems is:
a. High operating cost
b. High installation cost
c. High maintenance cost
d. Temperature control
e. Pollution
a. High operating cost
The quartz lamp heating element will respond:
a. Instantaneously
b. In a few seconds
c. In about one minute
d. In about thirty seconds
e. In about three minutes
b. In a few seconds
The main disadvantage of electric heating is the:
a. High maintenance cost
b. Poor local temperature control
c. Expensive installation
d. High operating cost
e. All of the above
d. High operating cost
One of the advantages of electric infrared heating by quartz lamp is:
a. It can heat a large area entirely
b. No ventilation is required
c. It can be used as the main heating source for a large building
d. It is not affected seriously be exposure to wind
e. Power failure does not affect the operation of the heater
d. It is not affected seriously be exposure to wind
Electrical heating can be divided into two general groups:
a. Floor and wall
b. Direct and indirect
c. Wall and baseboard
d. Radiant panel and infrared
e. Direct and infrared
b. Direct and indirect
Gas-fired infrared heaters use the principle of:
a. Heating a gas
b. Heating a solid surface
c. Heating a liquid
d. Heating a porous material
e. All of the above.
b. Heating a solid surface
Infrared heaters are usually mounted:
a. Overhead
b. On walls
c. In floors
d. Under windows
e. Over doors.
a. Overhead
Heating plants with multiple boilers often have:
a. Independent boiler feedwater controls from a header
b. Individual feedwater systems
c. Feedwater pressure regulating valves for each boiler
d. Separate condensate receivers
e. A common feedwater control valve
a. Independent boiler feedwater controls from a header
Dissolved oxygen in condensate:
a. Will cause pitting in a boiler
b. Can cause pitting on the return lines
c. Causes grooving of the condensate lines
d. Cannot be removed with chemicals
e. Necessitates the installation of a deaerator
a. Will cause pitting in a boiler
Because of variations in flow rate, nearly all, large steam heating plants utilize:
a. An economizer
b. A deaerator
c. A condensate receiver
d. Multiple boilers
e. Steam pressure, regulating valves
c. A condensate receiver
A float operated mechanical feeder valve should:
a. Be a normally closed valve.
b. Open just after the low-water cutoff switch opens.
c. Be located above the water column.
d. Not open until the level is well below the feed pump cut-in level.
e. Not be deemed a stand-by device
d. Not open until the level is well below the feed pump cut-in level.
A feedwater make-up system should:
a. Be able to satisfy the needs of at least one boiler in a multi-boiler plant.
b. Utilize a deaerator.
c. Be able to satisfy normal firing needs.
d. Always be softened water.
e. Utilize demineralizers.
c. Be able to satisfy normal firing needs
Equalizing lines on a condensate receiver float chamber:
a. Will dampen level fluctuations
b. Maintains equal flow of condensate to multiple boilers
c. Maintain make-up flow equal to condensate flow
d. Eliminate the need for a make-up level control valve
e. Keep receiver level equal to boiler level
a. Will dampen level fluctuations
A condensate receiver low, level cutoff switch will:
a. Act to open a make-up solenoid
b. Stop the feed pump thereby preventing damage to it
c. Act to close boiler fuel valve(s)
d. Sound an alarm
e. Cause the make-up valve to close
b. Stop the feed pump thereby preventing damage to it
An electric feeder valve will:
a. Eliminate the need for a low-water fuel cutoff
b. Prevent a low-water trip
c. Open before the low-water cutoff line is reached
d. Require manual action to open
e. Open after the unit trips on low water
c. Open before the low-water cutoff line is reached
The result of a condensate receiver that is too small could be:
a. High boiler water level(s)
b. Loss of condensate to the sewer
c. Loss of make-up water
d. Unacceptable high steam pressures
e. Low make-up water flow rates
b. Loss of condensate to the sewer
In nearly all LP steam heating systems the feedwater:
a. Is usually condensate
b. Requires daily close scrutiny of chemical values
c. Is a high make-up percentage
d. Must be deaerated
e. Requires preheating in an economizer
a. Is usually condensate
When a boiler equipped with a combination feedwater control and low water cutoff device shuts down due to a low water condition:
a. The feedwater flow will also stop
b. The level must be restored to above the cutoff line before the unit can be restarted
c. It can be restarted by simply resetting the cutoff switch
d. A manual reset switch must be used
e. A pre-purge will not be necessary
b. The level must be restored to above the cutoff line before the unit can be restarted
The Hartford loop will:
a. Eliminate the need for venting a steam heating system
b. Ensure continuous circulation of a hot water system
c. Prevent steam from entering a steam pressure gage
d. Prevent boiler water level from going below the lowest safe water level
e. Prevent the draining of an expansion tank
d. Prevent boiler water level from going below the lowest safe water level
Neutralizing amines:
a. Raise the pH of condensate
b. Lower the pH of boiler water
c. Eliminate boiler pitting
d. Can cause return grooving
e. Absorb carbon dioxide.
a. Raise the pH of condensate
The feedwater supply to most heating boilers is controlled by a _____ switch.
a. Solenoid
b. Float
c. Differential pressure
d. Drum level
e. Pressure.
b. Float
As a general rule the size of the condensate receiver should be large enough to hold a volume of condensate equal to the water evaporated by the boiler in a _____ hour period.
a. Two
b. One and one half
c. One
d. Three quarters
e. One half.
e. One half
