FDNY Z51 WRITTEN EXAM/ FDNY Z51
EXAM BANK | 2025 COMPLETE ACCURATE
REAL EXAM QUESTIONS WITH DETAILED
ANSWERS | ALREADY GRADED A+ |
GUARANTEED EXCELLENCE PASS
When must the Fire Department be notified that a fire protection system is out of
service?
A) The manual pull alarm station in the lobby will be out of service for 4 hours.
B) Four sprinkler heads on a same floor of your building will be out of service for 2
hours.
C) The sprinkler system will be out of service on 1st and 2nd floors.
D) The fire alarm system is out of service in the refrigerating system room for g
hours. - ✔✔✔ Correct Answer > C) The sprinkler system will be out of service on
1st and 2nd floors.
A refrigeration engineer is running two centrifugal water pumps in parallel. One of
the pumps is running at maximum pumping rate. If, by mistake, the refrigeration
engineer throttles back on the discharge valve of the other pump, the most likely
effect will be
A) for the pump components to maintain both the flow rate and the discharge
pressure.
,B) a reduction in the water pressure at the condenser inlet.
C) a reduction on the total flow rate to the condenser.
D) a reduction in both the water flow rate and pressure to the condenser. - ✔✔✔
Correct Answer > C) a reduction on the total flow rate to the condenser.
When entering Phase 2 fireman's service, which statement is correct?
A) Can only be used by a firefighter.
B) Must be tested semi-annually.
C) Does not need a special key.
D) The elevator operator is the only person that could control the elevator. -
✔✔✔ Correct Answer > D) The elevator operator is the only person that could
control the elevator.
In a building with a multizone standpipe system, how is each zone supplied
water?
A) It will supply only the highest standpipe zone.
B) Each zone will have its own automatic water supply.
C) Each zone will be connected to the main water supply.
D) It will supply only the lowest standpipe zone. - ✔✔✔ Correct Answer > B) Each
zone will have its own automatic water supply.
The amount of electrical power used to operate a solenoid valve or motor is
measured in
,A) amperes.
B) ohms.
C) foot pounds.
D) volts. - ✔✔✔ Correct Answer > D) volts.
The suction service valve of a reciprocating compressor is front-seated and the
compressor runs until the low-pressure cut-out shuts the compressor off. When
the machine is off, the refrigeration engineer notices that the suction pressure
increases rapidly. The most probable cause of the pressure rise is
A) a leaky suction service valve.
B) a faulty gauge.
C) All answers are correct.
D) the malfunction of a compressor valve. - ✔✔✔ Correct Answer > D) the
malfunction of a compressor valve.
What happens when a steam turbine reaches critical speed?
A) The turbine will slow down.
B) The turbine will vibrate violently.
C) The turbine will shut down.
D) The turbine will speed up. - ✔✔✔ Correct Answer > B) The turbine will vibrate
violently.
Regarding fire safety, which ASHRAE refrigerant safety classification indicates no
flammability and lower toxicity?
, A) B2
B) A3
C) A1
D) B1 - ✔✔✔ Correct Answer > C) A1
Water regulation valves are used to
A) maintain refrigerant temperature.
B) maintain low-side pressure to proper level.
C) vary flow based on water temperature.
D) maintain condenser pressure to a predetermined level. - ✔✔✔ Correct Answer
> D) maintain condenser pressure to a predetermined level.
How would you calibrate a thermometer?
A) Place the thermometer in a cup of hot water.
B) Place the thermometer in superheated steam.
C) Place the thermometer in a cup of ice water.
D) Compare temperature to another thermometer. - ✔✔✔ Correct Answer > C)
Place the thermometer in a cup of ice water.
An equalizer line on a TXV is used to
A) Compensate for the pressure drop across the evaporator coil.
EXAM BANK | 2025 COMPLETE ACCURATE
REAL EXAM QUESTIONS WITH DETAILED
ANSWERS | ALREADY GRADED A+ |
GUARANTEED EXCELLENCE PASS
When must the Fire Department be notified that a fire protection system is out of
service?
A) The manual pull alarm station in the lobby will be out of service for 4 hours.
B) Four sprinkler heads on a same floor of your building will be out of service for 2
hours.
C) The sprinkler system will be out of service on 1st and 2nd floors.
D) The fire alarm system is out of service in the refrigerating system room for g
hours. - ✔✔✔ Correct Answer > C) The sprinkler system will be out of service on
1st and 2nd floors.
A refrigeration engineer is running two centrifugal water pumps in parallel. One of
the pumps is running at maximum pumping rate. If, by mistake, the refrigeration
engineer throttles back on the discharge valve of the other pump, the most likely
effect will be
A) for the pump components to maintain both the flow rate and the discharge
pressure.
,B) a reduction in the water pressure at the condenser inlet.
C) a reduction on the total flow rate to the condenser.
D) a reduction in both the water flow rate and pressure to the condenser. - ✔✔✔
Correct Answer > C) a reduction on the total flow rate to the condenser.
When entering Phase 2 fireman's service, which statement is correct?
A) Can only be used by a firefighter.
B) Must be tested semi-annually.
C) Does not need a special key.
D) The elevator operator is the only person that could control the elevator. -
✔✔✔ Correct Answer > D) The elevator operator is the only person that could
control the elevator.
In a building with a multizone standpipe system, how is each zone supplied
water?
A) It will supply only the highest standpipe zone.
B) Each zone will have its own automatic water supply.
C) Each zone will be connected to the main water supply.
D) It will supply only the lowest standpipe zone. - ✔✔✔ Correct Answer > B) Each
zone will have its own automatic water supply.
The amount of electrical power used to operate a solenoid valve or motor is
measured in
,A) amperes.
B) ohms.
C) foot pounds.
D) volts. - ✔✔✔ Correct Answer > D) volts.
The suction service valve of a reciprocating compressor is front-seated and the
compressor runs until the low-pressure cut-out shuts the compressor off. When
the machine is off, the refrigeration engineer notices that the suction pressure
increases rapidly. The most probable cause of the pressure rise is
A) a leaky suction service valve.
B) a faulty gauge.
C) All answers are correct.
D) the malfunction of a compressor valve. - ✔✔✔ Correct Answer > D) the
malfunction of a compressor valve.
What happens when a steam turbine reaches critical speed?
A) The turbine will slow down.
B) The turbine will vibrate violently.
C) The turbine will shut down.
D) The turbine will speed up. - ✔✔✔ Correct Answer > B) The turbine will vibrate
violently.
Regarding fire safety, which ASHRAE refrigerant safety classification indicates no
flammability and lower toxicity?
, A) B2
B) A3
C) A1
D) B1 - ✔✔✔ Correct Answer > C) A1
Water regulation valves are used to
A) maintain refrigerant temperature.
B) maintain low-side pressure to proper level.
C) vary flow based on water temperature.
D) maintain condenser pressure to a predetermined level. - ✔✔✔ Correct Answer
> D) maintain condenser pressure to a predetermined level.
How would you calibrate a thermometer?
A) Place the thermometer in a cup of hot water.
B) Place the thermometer in superheated steam.
C) Place the thermometer in a cup of ice water.
D) Compare temperature to another thermometer. - ✔✔✔ Correct Answer > C)
Place the thermometer in a cup of ice water.
An equalizer line on a TXV is used to
A) Compensate for the pressure drop across the evaporator coil.
