Book 1 Review Flashcards
The gas burners of hot oil heaters are mounted:
A) On the walls of the furnace
B) On the front of the furnace
C) On the floor of the furnace
D) On the roof of the furnace
E) External to the furnace
C) On the floor of the furnace
The slip expansion joint is suitable for:
A) Medium and high pressures
B) Medium and high temperature
C) Low and medium temperatures
D) Low and high pressures
E) Low and medium pressures
E) Low and medium pressures
Quick closing gauge glass valves are operated by:
A) Diaphragms
B) Valve rods
C) Actuators
D) Levers and chains
E) Solenoids
D) Levers and chains
A disadvantage of condensing boilers is that:
A) Any moisture in the flue gases will not condense out
B) The boilers are more expensive than customary boilers
C) The boilers are less expensive than customary boilers
D) The heat exchangers in them are quite small
E) Less heat is extracted from the hot flue gases
B) The boilers are more expensive than customary boilers
The blowdown connection is made to the:
A) Highest point of the boiler shell
B) Highest point of the steam drum
C) Highest point of the mud drum
D) Lowest point of the steam drum
E) Lowest point of the mud drum
E) Lowest point of the mud drum
With reference to hot oil systems the acronym FCV stands for:
A) Flow control valve
B) Flow cutoff valve
C) Fuel cutoff valve
D) Full cascade valve
E) Fuel control valve
A) Flow control valve
If the combustion is complete the sulphuric will combine with the oxygen to produce ________ plus heat.
A) Water vapour
B) Sulphur dioxide
C) Carbon dioxide
D) Carbon monoxide
E) Sulphur monoxide
B) Sulphur dioxide
An advantage of plastic piping is:
A) Ease of assembly
B) Resistance to high temperatures
C) Ease of corrosion
D) High cost
A) Ease of assembly
When the heating plant has two or more boilers supplying steam to a common steam supply header and one or more boilers are already in operation the_________ during the warm-up period.
A) Feedwater valve of the boiler that is being started up must be kept closed
B) Feedwater stop valve of the boiler that is being started up must be kept open
C) Steam vent valve of the boiler that is being started up must be kept open
D) Steam stop valve of the boiler that is being started up must be kept open
E) Steam stop valve of the boiler that is being started up must be kept closed
E) Steam stop valve of the boiler that is being started up must be kept closed
If damp conditions exist during the idle season, the metal surfaces should be painted with a protective coating such as:
A) Oil based paint
B) Fuel oil
C) Latex paint
D) Grease
E) Light oil
E) Light oil
The purpose of the gauge glass or water gauge is to show the __________ in the boiler.
A) Steam level
B) Colour of the water
C) Temperature of the steam
D) Pressure of the water
E) Water level
E) Water level
Pressure gauges may loose their accuracy due to:
A) Wear and tear
B) Steam entering the Bourbon tube
C) Metal fatigue
D) Excessive vibration
E) All of the above
E) All of the above
Since pure water will not conduct electricity a predetermined amount of electrolyte (__________) is dissolved in the water.
A) H2SO4
B) HCl
C) NaSO3
D) NaCl
E) NaOH
D) NaCl
Overheating of the tube wall may be caused by all but:
A) Failure of the low water fuel cut-off
B) Low excess air
C) Heavy scale forming on the tubes
D) Poor water circulation
E) An excessive firing rate
B) Low excess air
Tubes adjacent to sootblowers are examined for signs of _________ due to direct impingement of steam from the blowers.
A) Overheating
B) Erosion
C) Corrosion
D) Oxygen pitting
E) Caustic embrittlement
B) Erosion
The flash point is the __________ at which the fuel oil gives off enough vapour to ignite when exposed to an open flame but not continue to burn.
A) Highest temperature
B) Auto ignition temperature
C) Lowest temperature
D) Lowest pressure
E) Highest pressure
C) Lowest temperature
Normally in a steam boiler when the water level drops to the low-water cut-off point, the boiler will:
A) Experience a failure of a pressure component
B) Automatically open the emergency feedwater valve
C) Sound an alarm in the control room
D) Shut down automatically
E) Continue to operate normally
D) Shut down automatically
An automatic/manual selector switch is provided on a boiler with the following burner control system.
A) Operating limit fire control
B) High limit fire control
C) High-low fire control
D) On-off fire control
E) Modulating fire control
E) Modulating fire control
If the water level in a steam boiler is found to be below the gauge glass, the boiler should be:
A) Shut down immediately
B) Filled immediately with warm water
C) Allowed sufficient time to return to normal
D) Filled immediately with cold water
E) Reduced to minimum load
A) Shut down immediately
A thermocouple consists of two dissimilar wires welded together at one end to form a:
A) Metering junction
B) Cold junction
C) Reference junction
D) Hot junction
E) Electric circuit
D) Hot junction
The operation of a system with two or three fixed capacity nozzles is controlled by the operating pressure or temperature control on the boiler on an ________ cycle.
A) Seam flow fuel flow
B) Modulating
C) Air flow fuel flow
D) On-off
E) Low-high-low
E) Low-high-low
The switch in the operating control of a steam boiler is opened by:
A) Falling steam pressure
B) Falling water pressure
C) Rising steam temperature
D) Falling steam temperature
E) Rising steam pressure
E) Rising steam pressure
A U-tube draft gauge is also known as a:
A) Psychrometer
B) Viscometer
C) Pressure gauge
D) Thermometer
E) Manometer
E) Manometer
The component of natural gas that occupies 10%-20% is:
A) Methane
B) Ethane
C) Butane
D) Propane
E) Hydrogen sulphide
B) Ethane
The average heating value of coal (bituminous) is:
A) 93,150 kJ/m3 (2,500 Btu/ft3)
B) 37,260 kJ/m3 (1,000 Btu/ft3)
C) 122,200 kJ/m3 (3,280 Btu/ft3)
D) 25,600 kJ/m3 (11,000 Btu/ft3)
E) 45,260 kJ/m3 (19,500 Btu/ft3)
D) 25,600 kJ/m3 (11,000 Btu/ft3)
All valves not properly or clearly identified should be:
A) Used as they are available
B) Kept for emergency use
C) Sold for scrap
D) Rejected
E) Used in non critical areas
D) Rejected
The most important rule in the safe operation of steam boilers is to:
A) Keep water in the boiler at the proper level
B) Blowdown the gauge glass regularly
C) Add chemicals to the boiler feedwater
D) Keep the boiler pressure below the safety valve setting
E) Keep the feedwater chemical free
A) Keep water in the boiler at the proper level
The rotary cup oil burner rotates at about _________ r/min.
A) 3,500
B) 2,500
C) 1500
D) 3 000
A) 3500
Threaded cast iron pipe fittings cannot be used for _______ service piping systems.
A) Steam
B) Water
C) gas
D) Oil
E) Chemicals
C) Gas
The float operated low water fuel cut-off works on the principle of:
A) Steam density
B) Drum level variation
C) Temperature change
D) Buoyancy
E) Differential pressure
D) Buoyancy
In the wet boiler lay up method chemicals are added to bring the boiler water to the required.
A) TDS
B) pH
C) Excess oxygen scavenger level
D) Density
E) Acidity
C) Excess oxygen scavenger level
The on-off pressure controller contains two adjustable variables, one is the pressure adjustment and the other is the:
A) Differential adjustment
B) Operating lever
C) Cut-in lever
D) Levelling indicator
E) Pressure bellows
A) Differential adjustment
With reference to Power Engineering the letters “SIAP” mean:
A) Steam, Interpret, Analyze, Pressure
B) Sense, Interpret, Analyze, Perform
C) Steam, Increase, Answer, Power
D) Steam, Interpret, Analyze, Perform
E) Sense, Increase, Answer, Perform
B) Sense, Interpret, Analyze, Perform
Cast-iron boiler sections maximize heat transfer by:
A) Exposing as large a surface as possible to the hot gases
B) Vertical firing
C) Utilizing an external furnace
D) Using four push nipples per section
E) Using a large economizer
A) Exposing as large a surface as possible to the hot gases
Overheated oil will break down forming a solid mass of carbon called:
A) Carbon
B) Graphite
C) Coke
D) Steel
E) Coal
C) Coke
The draft created by the fan can be controlled by the:
A) Amount of fuel supplied
B) Height of the stack
C) Temperature of the flue gases
D) Speed of the dampers
E) Use of inlet dampers
E) Use of inlet dampers
The discharge piping from the relief valve should be piped to a safe point for disposal and can be:
A) Terminated above a floor drain
B) Connected to the deaerator
C) Connected to any vent
D) Connected to the condensate tank
E) Connected to any drain
A) Terminated above a floor drain
The purpose of the steam trap is to discharge water and condensate from steam lines and equipment without:
A) Permitting steam to enter
B) Permitting corrosion
C) Letting air escape
D) Permitting steam to escape
E) Letting air enter
D) Permitting steam to escape
The HRT boiler is classified as a ________ pass boiler.
A) Four
B) Two
C) Three
D) Multi
E) One
B) Two
It is unlawful to have any welder other than the holder of a Pressure Welder Certificate and a valid _________ do any welding on any pressure part of the boiler.
A) First aid certificate
B) “B” pressure ticket
C) Union card
D) Quality assurance card
E) Performance Qualification Card
E) Performance Qualification Card
One of the different general classes of traps according to their principle of operation is the ________ trap.
A) Pneumatic
B) Electrical
C) Hydraulic
D) Thermodynamic
E) Electronic
D) Thermodynamic
The slip expansion joint requires __________ than the expansion bend.
A) Higher pressures
B) Higher temperatures
C) Less space
D) More space
E) Lower temperatures
C) Less space
The safety valve pop test can be carried out by:
A) Reducing the pressure on the spring
B) Slowly raising the boiler pressure
C) Lowering the try lever
D) Lifting the try lever
E) Popping the valve with a hammer
B) Slowly raising the boiler pressure
Which of the following is not a characteristic of materials suitable for use as insulation?
A) Ability to retain its shape and insulating value when wet
B) High insulating value
C) Long life
D) Vermin proof
E) Corrosive
E) Corrosive
Valve stem leaks can normally be fixed by:
A) Tightening the hand wheel down
B) Tightening the hand wheel nut
C) Slightly backing off the hand wheel
D) Slightly tightening the packing nut or gland
E) Tightening the bonnet connection
D) Slightly tightening the packing nut or gland
One of the types of expansion joints in general use is the ________ expansion joint.
A) Slip
B) Double offset u-bend
C) U-bend
D) Elbow
E) Coupling
A) Slip
The service temperature limit of Elastomeric insulation is:
A) 1038ºC (1900ºF)
B) 454ºC (850ºF)
C) 650ºC (1200ºF)
D) 104ºC (219ºF)
E) 320ºC (608ºF)
D) 104ºC (219ºF)
A valve bonnet leak is from the connection between the:
A) Stem and the disc
B) Bonnet and the gland
C) Bonnet and the body
D) Bonnet and the disc
E) Stem and the gland
C) Bonnet and the body
The switch in the operating control of a hot water boiler is opened by:
A) Falling water pressure
B) Rising steam temperature
C) Rising water pressure
D) Rising water temperature
E) Falling water temperature
D) Rising water temperature
The diameter of commercial pipe is measured by its:
A) Inside diameter
B) Nominal pipe size
C) Outside diameter
D) Wall thickness
E) Natural pipe size
B) Nominal pipe size
Valve packing surrounds the:
A) Stem
B) Disc
C) Body
D) Bonnet
E) Packing gland
A) Stem
At normal boiler steaming rates, a condensate receiver tank should contain a sufficient volume of water equivalent to the water evaporated by the boiler for a maximum period of ________ minutes.
A) 60
B) 15
C) 30
D) 20
E) 45
C) 30
The vertical firetube boiler should be warmed up slowly in order to prevent overheating of the:
A) Crown sheet and water legs
B) Crown sheet and barrel
C) Tubes and upper tube sheet
D) Tubes and lower tube sheet
E) Steam drum and mud drum
C) Tubes and upper tube sheet
The major components of a typical hot oil system include the furnace, pump, control devices and the:
A) Containment dyke
B) Stack damper
C) Gas blanket
D) Relief valve
E) Surge tank
E) Surge tank
The grooved pipe system uses a joining connection made with a/an ____________ that also serves as a union between the fitting and the piping.
A) Elbow
B) Coupling collar
C) Flange fitting
D) Quick couple
E) Adaptor
B) Coupling collar
Possible causes of low water level include:
1. Leaks caused by breakage or corrosion
2. Excessive blowdown
3. Automatic feedwater valve passing
4. Boiler feed pump failure
5. Excessive make-up
A) 1,2,3
B) 3,4,5
C) 1,2,4
D) 2,3,4
E) 2,3,5
C) 1,2,4
Convection type oil heaters for a hot oil system have:
A) An efficiency of about 75% to 85%
B) Mechanical draft combustion systems
C) Efficiencies of about 40% to 50%
D) Combustion gases flowing inside tubes
E) Tubes containing fins on their inner surfaces
A) An efficiency of about 75% to 85%
When a cold, gas-fired boiler is started up, condensation (sweating) may occur to such an extent that it appears that the boiler is leaking. What (if anything) should be done to stop this?
A) Decrease the fuel/air ratio to stop the sweating
B) Decrease the firing rate to stop the sweating
C) Increase the fuel/air ratio to stop the sweating
D) Increase the firing rate to stop the sweating
E) This condensation will stop after the boiler becomes hot
E) This condensation will stop after the boiler becomes hot
Before closing manhole and handhole openings:
1. Make sure that the seating surfaces are clean
2. Traces of old gaskets left behind may cause leakage
3. Use old gaskets coated with powdered graphite or a gasket compound
4. Use new gaskets
A) 1,3,4
B) 2,,3,4
C) 1,2,4
D) 1,2,3
C) 1,2,4
The time taken for the automatic pilot valve to close in the event of a loss of flame detection is about ________ seconds
A) 2
B) 10
C) 15
D) 20
E) 4
B) 10
Oils intended for use as heat transfer fluid in a hot oil system should:
A) Have a high viscosity
B) Have a low vapour pressure at operating temperature
C) Be corrosive to metals used in the system
D) Resist thermal breakdown at low operating temperatures
E) Possess low heat transfer characteristics
B) Have a low vapour pressure at operating temperature
After cleaning, cast-iron boilers should be left completely filled with__________ in order to reduce corrosion.
A) A slightly acidic solution
B) A mixture of oil and antifreeze
C) A slightly basic solution
D) Light oil
E) Water
E) Water
Copper and copper alloys offer great resistance to:
A) Creep
B) Thermal expansion
C) High pressure
D) Corrosion
E) Breakage
D) Corrosion
Valves can be manually operated or they can have a/an _________ to change and control the valve opening.
A) Positioner
B) Accumulator
C) Actuator
D) Assistance
E) Driver
C) Actuator
If boiler water level has dropped below the gauge glass during operation, the operator is to:
A) Slowly reduce the boiler load
B) Immediately restore water level before shutting off the unit
C) Shut down, cool, and then inspect the boiler for damage before refilling
D) Open the blowdown valves in order to have the low water fuel cut-off trip the unit
E) Contact the boiler inspector immediately
C) Shut down, cool, and then inspect the boiler for damage before refilling
Standard antifriction bearings normally require lubrication once every ________ year/s.
A) 3
B) 5
C) 1
D) 4
E) 2
C) 1
The high-low fire control method requires two pressure controllers, one is called the high-low fire control and the other is called the:
A) Operating limit pressure control
B) Operating limit fire control
C) Modulating fire control
D) High limit fire control
E) On-off fire control
A) Operating limit pressure control
To ensure complete combustion of the fuel in the furnace one of the following conditions must be fulfilled.
A) The temperature in the furnace must be high enough to ignite the fuel as it enters
B) Enough air must be supplied to the furnace to provide sufficient nitrogen to combine with all the combustible elements of the fuel
C) The air and the fuel must be thoroughly mixed together so that each particle of fuel can come in contact with the necessary nitrogen
D) The furnace must be small enough to allow sufficient time for the combustion to be completed before the gases strike the cooler areas of the heating surfaces
E) The fuel must be in the solid state
A) The temperature in the furnace must be high enough to ignite the fuel as it enters
Quick closing gauge glass valves require ________ turn/s to close.
A) 1
B) 2
C) 3
D) 1/4
E) 1/2
D) 1/4
Joining or connecting lengths of piping by the use of threaded pipe and screwed connections has the advantage of:
A) There is no chance of leakage
B) Gaskets are not required
C) The piping can be easily assembled or disassembled
D) A qualified welder must be used
E) The strength of the pipe is not reduced
C) The piping can be easily assembled or disassembled
The diaphragm gas valve has a two-way pilot valve that:
A) Allows supply pressure gas to flow to the bottom of the diaphragm closing chamber and hold the main valve open
B) On shutdown opens a bleed port and closes an opening port
C) Allows supply pressure gas to flow to the top of the diaphragm closing chamber and hold the main valve open
D) Allows supply pressure gas to flow to the bottom of the diaphragm closing chamber and hold the main valve closed
E) On shutdown closes a bleed port and opens a closing port
E) On shutdown closes a bleed port and opens a closing port
An advantage of the forced draft fan over the induced draft fan is that the forced draft fan:
A) Handles the fuel fed to the burner
B) Requires more expensive materials
C) Endures higher temperatures
D) Handles hot air only
E) Handles lower volumes of gases
E) Handles lower volumes of gases
The refractory brick of the hot oil heater should be inspected for:
A) Abnormal cracks
B) Colour
C) Hardness
D) Density
E) Consistency
A) Abnormal cracks
A programming control on a natural draft gas fired boiler operates in the following sequence:
1. The main burner is ignited
2. The flame detector senses the flame and causes the main gas valve to open
3. The ignition transformer and pilot gas valve are de-energized and closed, if an interrupted pilot is used
4. The operating control initiates a startup
5. The load relay energizes the ignition transformer and the pilot gas valve
A) 4,5,2,1,3
B) 5,3,2,1,4
C) 2,5,1,4,3
D) 1,2,3,4,5
E) 3,2,1,5,4
A) 4,5,2,1,3
The automatic fill valve is a _______ valve which keeps the system filled with water and maintains a set pressure in the system.
A) Air vent valve
B) Temperature control valve
C) Pressure reducing valve
D) Pressure control valve
E) Back pressure valve
C) Pressure reducing valve
During inhibited acid cleaning the boiler must be adequately vented because _________ is produced by the reaction of acid with iron and could cause a fire or explosion.
A) Carbon monoxide
B) Carbon dioxide
C) Hydrogen
D) Nitrogen
E) Oxygen
C) Hydrogen
The fire point is the _________ the flash point which results in the fuel continuing to burn once ignited.
A) Temperature below
B) Pressure below
C) Pressure above
D) Auto ignition temperature below
E) Temperature above
E) Temperature above
The operation of the thermostatic trap depends upon the difference in:
A) Density between the steam and the condensate
B) Pressure between the steam and the air
C) Temperature between the steam and the condensate
D) Temperature between the steam and the air
E) Pressure between the steam and the condensate
C) Temperature between the steam and the condensate
One class of oil burner is the _______ burner.
A) Ring
B) Air or steam atomizing
C) After mix
D) Refractory
E) Pre-mix
B) Air or steam atomizing
When the main steam stop valves of heating boilers are over 51 mm (2 in) it is recommended that _________ be used.
A) Solenoid operated valves
B) Globe valves
C) Gate valves
D) OS&Y valves with rising spindles
E) Diaphragm operated valves
D) OS&Y valves with rising spindles
Purging of a furnace means forcing a flow of:
A) Water through a furnace for a set period of time when the burner is in operation
B) Air through a furnace for a set period of time when the burner is in operation
C) Air through a furnace for a set period of time when the burner is not in operation
D) Fuel through a furnace for a set period of time when the burner is not in operation
E) Fuel through a furnace for a set period of time when the burner is in operation
C) Air through a furnace for a set period of time when the burner is not in operation
In the electrode type electric boiler the electrodes are located in the:
A) Windbox
B) Central generating chamber
C) Firebox
D) Watertube section
E) Firetube section
B) Central generating chamber
In the dry boiler lay up method the boiler is dried out completely then trays with moisture absorbing materials such as _________ are placed in the shell.
1. Slack lime
2. Sodium sulphide
3. Activated alumina
4. Sodium hydroxide
5. Silica gel
A) 1,2,3
B) 1,3,5
C) 2,3,5
D) 3,4,5
E) 2,3,4
B) 1,3,5
The natural draft created by differential pressure can be changed by:
A) Decreasing the height of the stack
B) Increasing the density of the flue gas
C) Increasing the density of the fuel
D) Increasing the density of the air
E) Decreasing the density of the air
D) Increasing the density of the air
The longitudinal drum boiler is a ____________ combustion gas pass boiler.
A) Three
B) Four
C) One
D) Five
E) Two
A) Three
The most common type of rotary pump used for boiler fuel oil is the _______ pump.
A) Centrifugal
B) External or internal gear
C) Diaphragm
D) Rotary lobe
E) Piston
B) External or internal gear
The coefficient of thermal conductivity (k) of a material is a measure of the amount of heat that will be _________ the material.
A) Absorbed into
B) Transmitted through
C) Generated by
D) Radiated from
E) Reflected by
B) Transmitted through
An advantage of a cast-iron sectional boiler is:
A) Their large capacity
B) Light weight requiring a minimal foundation
C) The choice of assembly location
D) Small fixed size
E) It’s ability to withstand high pressure
C) The choice of assembly location
One of the advantages of the serpentine watertube boiler is that the design it:
A) Decrease the height of the boiler
B) Increases the water capacity of the boiler
C) Eliminates expansion and contraction stress
D) Produces a smaller foot print
E) Is capable of very high steam pressures
C) Eliminates expansion and contraction stress
The two types of boiler combustion control include:
1. On-off
2. Automatic
3. Modulating
4. Manual
A) 1,2
B) 2,3
C) 3,4
D) 1,3
E) 2,4
D) 1,3
Before installing a trap blow new lines clear of all:
A) Steam
B) Foreign matter
C) Air
D) Condensate
E) Carbon dioxide
B) Foreign matter
In a bimetal steam trap, ___________ are welded together.
A) Strips of iron and constantan
B) Dissimilar metals
C) Strips of copper
D) Strips of tin
E) High temperature strips of plastic
B) Dissimilar metals
A pressure gauge can most accurately be calibrated by using:
A) A dead weight tester
B) Another pressure gauge
C) Hydraulic comparator
D) The inspectors test gauge
E) A test gauge comparator
A) A dead weight tester
The amount of air required for complete combustion is more than the theoretical air and is called:
A) Excess air
B) Theoretical air
C) Secondary air
D) Tertiary air
E) Primary air
A) Excess air
If the burner fails to ignite during the ignition trial period, the lock-out switch is activated and the boiler cannot be restarted until:
A) The fuel valve has been reset
B) The switch has been manually reset
C) The switch resets automatically
D) A short time period has passed
E) The furnace has been purged
B) The switch has been manually reset
A gaseous fuel used in a boilers could be:
A) Natural gas
B) Fuel oils
C) Diesel fuel
D) Coal
E) Wood
A) Natural gas
The types of construction used with packaged boilers are:
1. A
2. B
3. C
4. D
5. O
A) 1,2,4
B) 1,2,3
C) 1,4,5
D) 2,3,5
E) 2,3,4
C) 1,4,5
If the combustion is complete the hydrogen will combine with the oxygen to produce __________ plus heat.
A) Carbon dioxide
B) Sulphur dioxide
C) Water vapour
D) Carbon monoxide
E) Sulphur monoxide
C) Water vapour
Oils intended for use as heat transfer fluid in a hot oil system should:
A) Possess high heat transfer characteristics
B) Have a high vapour pressure at operating temperature
C) Have a high viscosity
D) Be corrosive to metals used in the system
E) Resist thermal breakdown at low operating temperatures
A) Possess high heat transfer characteristics
Most traps are designed to discharge any _________ present in the lines or equipment.
A) Oxygen
B) Carbon dioxide
C) Air
D) Steam
E) Oil
C) Air
