Q-01 FDNY COMPLETE ACTUAL EXAM
Rupture members, when used in parallel with a relief valve, are not to exceed _____
% above designed working pressure - ANSWER 20%
Butterfly valve: where can it be used? - ANSWER Can be used on the inlet and
outlet of a water pump
What electrical motor protection device automatically resets itself? - ANSWER The
thermal protector
746 watts equals how many kilowatt hours? - ANSWER .746 kilowatt hours
What position is the liquid line service valve normally in? - ANSWER Back-seated
In an operating evaporator, oil stays on top of which refrigerant? - ANSWER
Carbon dioxide, R-744
At what pressure does the relief valve blow on a high pressure machine? - ANSWER
300 psi
What would indicate a restriction (such as dirt or scale) in the liquid line? - ANSWER
Frost immediately after the restriction
What does solubility mean? - ANSWER The ability of a refrigerant to mix with other
substances
Charging Vapor —In a compression system, where do you charge the vapor? -
ANSWER Suction side of the compressor at the Suction Service Valve
When comparing a brine with s PH of 8 to one with a PH of 10, its alkalinity is: -
ANSWER 100 times greater (ex. PH 8 to PH 9 is 10 times greater)
In an efficiently operating induced draft cooling tower, the leaving water is between: -
ANSWER Dry bulb and wet bulb temperature
To produce the desired evaporator temperature, the power input is reduced by
keeping head pressure... - ANSWER Head pressure as low as possible & suction
pressure as high as needed
The accumulator is usually between the... - ANSWER Compressor and evaporator
An oiling system in a large centrifugal system should consist of at least... - ANSWER
Reservoir, pump and distribution lines
In an evaporator that chills brine, the greatest cooling effect on the brine results from
the... - ANSWER Boiling of low pressure liquid
,The flow of weak liquor to the absorber is controlled by
A) gas pressure
B) throttling device
C) float valve
D) pressure of the strong liquor pump - ANSWER B) throttling device
The best way of detecting ammonia brine is by using
A) CO2 gas
B) potassium of lime
C) Nessler reagent
D) carbonate of soda - ANSWER C) Nessler reagent
The best time to purge an ammonia plant with 250 lbs. of ammonia is
A) during shut-down, because you will lose ammonia
B) while charging the plant
C) during operation
D) none of the above - ANSWER C) during operation
What will make the strong liquor in the absorber decrease?
A) expansion valve open too much
B) A decrease in evaporator load
C) An increase in evaporator load
D) Too much steam on the generator - ANSWER B) A decrease in evaporator load
Which of the following statements is incorrect?
A) A service valve is a key-operated shut-off valve used during shipment, installation
and repairs
B) Brine is a liquid cooled by refrigeration and used for the transmission of heat
C) A fusible plug has a set-temperature fusible member to relieve pressure
D) A rupture member automatically ruptures at a predetermined temperature -
ANSWER D) A rupture member automatically ruptures at a predetermined
temperature
Oil in a refrigerant should
A) have a high pour point
B) have a low flash point
C) have a high viscosity
D) not contain moisture - ANSWER D) not contain moisture
In an NH3 dry expansion evaporator with TXV and bulb clamped properly on the
outlet of the evaporator, the superheat is
A) 7 to 10° F
B) 5 to 9° F
C) 20 to 30° F
D) 1 to 2° F - ANSWER A) 7 to 10° F
The setting of a fusible plug is
A) 280° F
B) 300° F
C) 380° F
, D) 300 psig. - ANSWER A) 280° F
If the insulation was removed from the bulb of the expansion valve, what would
happen? - ANSWER Flooded evaporator —the TXV bulb opens in a range from 45
to 85° F. If the insulation was removed, the bulb would sense the temperature in the
machine room and keep the TXV open, thus flooding the evaporator.
On the most common three-phase, four-wire service, the voltage between any phase
and neutral should be
A) 105 volts
B) 120 volts
C) 208 volts
D) 220 volts - ANSWER B) 120 volts
A refrigerant overcharge would
A) increase head pressure
B) decrease head pressure
C) decrease solution-side pressure
D) decrease discharge-side pressure - ANSWER A) increase head pressure
A dryer is generally installed with other equipment in a commercial Freon
compressor system. The recommended location of this dryer is on the
A) high-pressure line between condenser and reciever
B) suction line between evaporator and compressor
C) discharge line between compressor and condenser
D) liquid line between receiver and expansion valve - ANSWER D) liquid line
between receiver and expansion valve
R-22 —What does it smell like? - ANSWER Odorless
Desirable characteristics of a refrigerant:
A) High __________
B) Low __________ - ANSWER A) High critical point
B) Low freezing point
Centrifugal Feed Water Pump
A) Start-up procedure
B) Shut-down procedure - ANSWER A) Start-up procedure
1) Lock-out, tag-out
2) Close discharge valve
3) Open suction valve
4) Turn on
5) Open discharge valve
B) Shut-down procedure
1) Lock-out, tag-out
2) close suction valve
3) close discharge valve
In order to vary the capacity of an absorption plant, you should regulate the.. -
ANSWER Flow of the water to the condenser
Rupture members, when used in parallel with a relief valve, are not to exceed _____
% above designed working pressure - ANSWER 20%
Butterfly valve: where can it be used? - ANSWER Can be used on the inlet and
outlet of a water pump
What electrical motor protection device automatically resets itself? - ANSWER The
thermal protector
746 watts equals how many kilowatt hours? - ANSWER .746 kilowatt hours
What position is the liquid line service valve normally in? - ANSWER Back-seated
In an operating evaporator, oil stays on top of which refrigerant? - ANSWER
Carbon dioxide, R-744
At what pressure does the relief valve blow on a high pressure machine? - ANSWER
300 psi
What would indicate a restriction (such as dirt or scale) in the liquid line? - ANSWER
Frost immediately after the restriction
What does solubility mean? - ANSWER The ability of a refrigerant to mix with other
substances
Charging Vapor —In a compression system, where do you charge the vapor? -
ANSWER Suction side of the compressor at the Suction Service Valve
When comparing a brine with s PH of 8 to one with a PH of 10, its alkalinity is: -
ANSWER 100 times greater (ex. PH 8 to PH 9 is 10 times greater)
In an efficiently operating induced draft cooling tower, the leaving water is between: -
ANSWER Dry bulb and wet bulb temperature
To produce the desired evaporator temperature, the power input is reduced by
keeping head pressure... - ANSWER Head pressure as low as possible & suction
pressure as high as needed
The accumulator is usually between the... - ANSWER Compressor and evaporator
An oiling system in a large centrifugal system should consist of at least... - ANSWER
Reservoir, pump and distribution lines
In an evaporator that chills brine, the greatest cooling effect on the brine results from
the... - ANSWER Boiling of low pressure liquid
,The flow of weak liquor to the absorber is controlled by
A) gas pressure
B) throttling device
C) float valve
D) pressure of the strong liquor pump - ANSWER B) throttling device
The best way of detecting ammonia brine is by using
A) CO2 gas
B) potassium of lime
C) Nessler reagent
D) carbonate of soda - ANSWER C) Nessler reagent
The best time to purge an ammonia plant with 250 lbs. of ammonia is
A) during shut-down, because you will lose ammonia
B) while charging the plant
C) during operation
D) none of the above - ANSWER C) during operation
What will make the strong liquor in the absorber decrease?
A) expansion valve open too much
B) A decrease in evaporator load
C) An increase in evaporator load
D) Too much steam on the generator - ANSWER B) A decrease in evaporator load
Which of the following statements is incorrect?
A) A service valve is a key-operated shut-off valve used during shipment, installation
and repairs
B) Brine is a liquid cooled by refrigeration and used for the transmission of heat
C) A fusible plug has a set-temperature fusible member to relieve pressure
D) A rupture member automatically ruptures at a predetermined temperature -
ANSWER D) A rupture member automatically ruptures at a predetermined
temperature
Oil in a refrigerant should
A) have a high pour point
B) have a low flash point
C) have a high viscosity
D) not contain moisture - ANSWER D) not contain moisture
In an NH3 dry expansion evaporator with TXV and bulb clamped properly on the
outlet of the evaporator, the superheat is
A) 7 to 10° F
B) 5 to 9° F
C) 20 to 30° F
D) 1 to 2° F - ANSWER A) 7 to 10° F
The setting of a fusible plug is
A) 280° F
B) 300° F
C) 380° F
, D) 300 psig. - ANSWER A) 280° F
If the insulation was removed from the bulb of the expansion valve, what would
happen? - ANSWER Flooded evaporator —the TXV bulb opens in a range from 45
to 85° F. If the insulation was removed, the bulb would sense the temperature in the
machine room and keep the TXV open, thus flooding the evaporator.
On the most common three-phase, four-wire service, the voltage between any phase
and neutral should be
A) 105 volts
B) 120 volts
C) 208 volts
D) 220 volts - ANSWER B) 120 volts
A refrigerant overcharge would
A) increase head pressure
B) decrease head pressure
C) decrease solution-side pressure
D) decrease discharge-side pressure - ANSWER A) increase head pressure
A dryer is generally installed with other equipment in a commercial Freon
compressor system. The recommended location of this dryer is on the
A) high-pressure line between condenser and reciever
B) suction line between evaporator and compressor
C) discharge line between compressor and condenser
D) liquid line between receiver and expansion valve - ANSWER D) liquid line
between receiver and expansion valve
R-22 —What does it smell like? - ANSWER Odorless
Desirable characteristics of a refrigerant:
A) High __________
B) Low __________ - ANSWER A) High critical point
B) Low freezing point
Centrifugal Feed Water Pump
A) Start-up procedure
B) Shut-down procedure - ANSWER A) Start-up procedure
1) Lock-out, tag-out
2) Close discharge valve
3) Open suction valve
4) Turn on
5) Open discharge valve
B) Shut-down procedure
1) Lock-out, tag-out
2) close suction valve
3) close discharge valve
In order to vary the capacity of an absorption plant, you should regulate the.. -
ANSWER Flow of the water to the condenser
