Misc. Questions Flashcards
When the boiler water has cooled to about _____ open the blowdown valves and drain the boiler. Select one:
A. 99°C (210°F)
B. 90°C (194°F)
C. 110°C (230°F)
D. 134°C (273°F)
E. 60°C (140°F)
B. 90°C (194°F)
The major components of a typical hot oil system include the furnace, pump, control devices and the: Select one:
A. Relief valve
B. Gas blanket
C. Stack damper
D. Containment dyke
E. Surge tank
E. Surge tank
On a hot water heating system the stop/balance check valve is also known as a _____ valve. Select one:
A. Triple duty
B. Pressure balancing
C. Double duty
D. Temperature control
E. Non-return
A. Triple duty
The “popping” pressure of a safety valve may be increased by: Select one:
A. Decreasing the spring pressure
B. Increasing the spring pressure
C. Lowering the adjusting ring
D. Raising the lifting lever
E. Raising the adjusting ring
B. Increasing the spring pressure
The infrared scanner is mounted on the end of a sighting tube in such a way that its temperature will not exceed: Select one:
A. 50°C (98°F)
B. 100°C (212°F)
C. 75°C (167°F)
D. 120°C (248°F)
E. 150°C (302°F)
B. 100°C (212°F)
The high gas pressure cut-off switch can be tested by: Select one:
A. Slowly raising the boiler pressure above the operating setpoint
B. Closing the main gas valve quickly
C. Slowly closing the main gas valve
D. Slowly covering the air supply to the fan
E. Quickly closing the main burner shut-off valve
E. Quickly closing the main burner shut-off valve
Clean steam may be used in: Select one:
A. Oil Refineries
B. Humidification systems
C. Gas plants
D. Chemical processes
E. Steam cleaning
B. Humidification systems
The blowdown tank is/does: Select one:
a. Does not allow the pressure to be reduced
b. Does not empty into the sewer
c. Not cool the water
d. Is not required on a low pressure boiler
d. Is not required on a low pressure boiler
Controls found on heating boilers include:
1. Operating controls
2. Pressure relief controls
3. High limit cut-off switches
4. Condensate level controls
5. Low limit cut-off switches
Select one:
A. 3, 4, 5
B. 1, 2, 3
C. 2, 3, 4
D. 3, 4, 5
E. 1, 3, 5
E. 1, 3, 5
The air present in steam lines and equipment must also be removed to prevent: Select one:
A. Corrosion from carbon dioxide
B. Corrosion from oxygen
C. Rusting from carbon dioxide
D. Pitting from carbon dioxide
E. Caustic embrittlement
A. Corrosion from carbon dioxide
In the one-pipe hot water heating system, the heating units are: Select one:
A. All supplied with water at the same temperature and the return from each convector flows the long way around to return to the boiler
B. Supplied from the main and the return from each convector is connected back to the main again downstream from the supply connection
C. Connected in series so the water circulates from the hot water supply main directly through all the convectors to the return main
D. Equipped with its own circulating pump
E. All supplied with water at the same temperature and the return from each convector flows by the shortest and most direct route back to the boiler
B. Supplied from the main and the return from each convector is connected back to the main again downstream from the supply connection
If the boiler water temperature was too low and the burner found to be out a probable cause would not be: Select one:
A. Flame failure device activated
B. Low air switch activated
C. Fuel valve not open
D. Low water cut off activated
E. Operating control set to low
E. Operating control set to low
Insufficient heat: Burner not lit: Setting controls too low or controls defective. Raise setting of temperature control and/or outdoor reset control…
Foreign material in a new system may break down chemically during the operation and if present in sufficient quantities, may cause the water to become: Select one:
A. Alkaline
B. Acidic
C. Soft
D. Hard
E. Dirty
B. Acidic
If there is restricted air flow through a heating unit the operator should check all but: Select one:
A. The filter is not plugged
B. Damper plates are fully closed
C. Curtains are restricting the air flow
D. Air passages are not restricted
E. A carpet is not restricting the air flow
B. Damper plates are fully closed
A little misleading, Damper plates should be fully open for proper functioning.
The term space heater is generally applied to a fired heater which is installed in the space to be heated and heats the air directly without the use of: Select one:
A. An open flame
B. A blower
C. A combustion chamber
D. Steam or water
E. Any ducting
E. Any ducting
B2P6-11
The term space heater is generally applied to a fired heater that is installed in the space to be heated and heats the air directly without the use of any ducting.
In a forced warm air heating system a fresh air supply duct allows a controlled amount of outside air to enter the system: Select one:
A. After it passes through the filter
B. Before it is heated
C. After it is heated
D. Before it passes through the filter
E. After the blower
D. Before it passes through the filter
B2P6-3
A fresh air supply duct allows a controlled amount of outside air to enter the system for ventilation purposes. This air mixes with the return air before it passes through the filters.
Actual ventilation rates vary from: Select one:
A. 0.14 to 1.1 m³/min (5 to 40 cfm)
B. 0.1 to 1.1 m³/min (3.5 to 40 cfm)
C. 0.14 to 2 m³/min (5 to 71 cfm)
D. 1.4 to 11 m³/min (49 to 388 cfm)
E. 0.1 to 2 m³/min (3.5 to 71 cfm)
A. 0.14 to 1.1 m³/min (5 to 40 cfm)
The air velocity through a viscous filter of _____ is common. Select one:
A. 2.0 m/s (400 ft/min)
B. 4.0 m/s (800 ft/min)
C. 7.5 m/s (1500 ft/min)
D. 4.5 m/s (900 ft/min)
E. 2.5 m/s (500 ft/min)
E. 2.5 m/s (500 ft/min)
With the _____ heating method of heating the heat is transferred from the source of heat to the air and/or persons and objects in these areas. Select one:
A. Hot water
B. Steam
C. Radiant
D. Direct
E. Convection
D. Direct
B3P9-9
Direct Heating
The electric heating equipment is installed in the areas to be heated. Thus, heat is transferred directly from the source of heat to the air and/or persons and objects in these areas.
A disadvantage of the metal sheath electric infrared heating element is its: Select one:
A. Vibration resistance
B. Mounting position
C. Impact resistance
D. Thermal shock resistance
E. Wind resistance
E. Wind resistance
What is the emission temperature of a directly fired refractory heater? Select one:
A. 980°C - 1260°C (1800°F - 2300°F)
B. 760°C - 900°C (1400°F - 1650°F)
C. 315°C - 455°C (600°F - 850°F)
D. 560°C - 790°C (1040°F - 1450°F)
E. 400°C - 500°C (750°F - 930°F)
A. 980°C - 1260°C (1800°F - 2300°F)
Calculate the relative humidity of a sample of air that at 21°C (70°F) holds 0.01 kg (0.022 lb) of moisture if the maximum that it can hold at this temperature is 0.015 kg (0.033 lb). Select one:
A. 10.7%
B. 0.33%
C. 25.8%
D. 6.7%
E. 93.3%
D. 6.7%
Answer is wrong: 0.01 x 100 / 0.015=66.7
Should be 66.7%
The steam pressure on a steam grid humidifier should be in the range of: Select one:
A. 30 kPa to 60 kPa (4.4 to 8.7 psi)
B. 40 kPa to 55 kPa (5.8 to 8 psi)
C. 35 kPa to 70 kPa (5.1 to 10.2 psi)
D. 25 kPa to 45 kPa (3.6 to 6.5 psi)
E. 20 kPa to 30 kPa (2.9 to 4.4 psi)
C. 35 kPa to 70 kPa (5.1 to 10.2 psi)
One of the wetted element humidifiers group is the _____ type. Select one:
A. Pan
B. Wet
C. Spray
D. Power
E. Steam
D. Power
Wetted element humidifiers can be divided into two general groups: Power type and Bypass type