FDNY Z51 EXAM QUESTIONS AND
CORRECT DETAILED ANSWERS LATEST
UPDATE 2025 ALREADY GRADED A+.
⫸ A technician has been asked to estimate the cost of operating a 5
horsepower motor because the plant is billed by energy consumed as
kilowatt hours the technician will calculate the conversion the equivalent in
energy of a 5 horse power motor operating for 9 hours and kilowatt hours
is closest to. Answer: 33.6 (one horsepower equals. 746)
⫸ The only refrigerant/temperature chart available to refrigerate engineer
list the temperature in ﾟC if the chart indicates a Celsius temperature of 5ﾟ
the equivalent In Fahrenheit is. Answer: 41ﾟ (1.8 × 5)+ 32 equals)
⫸ How do you start a centrifugal chiller. Answer: Start the chilled water
pump then start the condenser water pump check oil start cooling tower
start compressor
⫸ A circuit breaker has a similar function as what. Answer: A fuse
⫸ A standpipe system will be out of service for 2 days how long should
there be fire watch. Answer: The entire time the standpipe is out of service
⫸ In a building with a multi zone How does each zone get supplied with
water. Answer: Each zone will have its own automatic water supply
⫸ Which service valve should be Install to isolate dual pressure relief valve
while keeping the system in service. Answer: 3 way valve
, ⫸ How many BTU's are removed in a 30 ton system. Answer: 360000
BTU's per hour
⫸ An automatic expansion valve maintains a constant. Answer: Evaporator
pressure
⫸ If the air lovers below the fans in an induced draft cooling tower become
clogged the result would be. Answer: Higher return water temperature
⫸ You have a cold front and there is a sudden drop in temperature the
thermostat will cause the solenoid valve. Answer: Close and pump the
compress it down and shut down on low pressure
⫸ What happens when a steam turbine reaches critical speed. Answer:
Turbine will vibrate violently
⫸ What Device automatically controls the speed of a steam turbine.
Answer: Governor valve
⫸ Under what circumstances is it OK to chain and exit. Answer: It is never
OK
⫸ The heat remove from the refrigerator in the condenser is. Answer:
Sensible and latent heat
⫸ There a fridge or in unit that you have been assigned to is being taken
out of service for major repair you have been assigned to withdraw a
refrigerant for storage and suitable containers according to New York City
fire code you must ensure the containers. Answer: Are approved by the US
Department of Transportation
CORRECT DETAILED ANSWERS LATEST
UPDATE 2025 ALREADY GRADED A+.
⫸ A technician has been asked to estimate the cost of operating a 5
horsepower motor because the plant is billed by energy consumed as
kilowatt hours the technician will calculate the conversion the equivalent in
energy of a 5 horse power motor operating for 9 hours and kilowatt hours
is closest to. Answer: 33.6 (one horsepower equals. 746)
⫸ The only refrigerant/temperature chart available to refrigerate engineer
list the temperature in ﾟC if the chart indicates a Celsius temperature of 5ﾟ
the equivalent In Fahrenheit is. Answer: 41ﾟ (1.8 × 5)+ 32 equals)
⫸ How do you start a centrifugal chiller. Answer: Start the chilled water
pump then start the condenser water pump check oil start cooling tower
start compressor
⫸ A circuit breaker has a similar function as what. Answer: A fuse
⫸ A standpipe system will be out of service for 2 days how long should
there be fire watch. Answer: The entire time the standpipe is out of service
⫸ In a building with a multi zone How does each zone get supplied with
water. Answer: Each zone will have its own automatic water supply
⫸ Which service valve should be Install to isolate dual pressure relief valve
while keeping the system in service. Answer: 3 way valve
, ⫸ How many BTU's are removed in a 30 ton system. Answer: 360000
BTU's per hour
⫸ An automatic expansion valve maintains a constant. Answer: Evaporator
pressure
⫸ If the air lovers below the fans in an induced draft cooling tower become
clogged the result would be. Answer: Higher return water temperature
⫸ You have a cold front and there is a sudden drop in temperature the
thermostat will cause the solenoid valve. Answer: Close and pump the
compress it down and shut down on low pressure
⫸ What happens when a steam turbine reaches critical speed. Answer:
Turbine will vibrate violently
⫸ What Device automatically controls the speed of a steam turbine.
Answer: Governor valve
⫸ Under what circumstances is it OK to chain and exit. Answer: It is never
OK
⫸ The heat remove from the refrigerator in the condenser is. Answer:
Sensible and latent heat
⫸ There a fridge or in unit that you have been assigned to is being taken
out of service for major repair you have been assigned to withdraw a
refrigerant for storage and suitable containers according to New York City
fire code you must ensure the containers. Answer: Are approved by the US
Department of Transportation
