FDNY
FDNY Z51 Exam Study Guide 2025
Engineer's Minimum Reading Log Requirement - Correct Answer-An engineer needs to
log readings once per shift.
Phase 2 Firemen Service - Correct Answer-The elevator operator is the only person that
can control the elevator.
Engineer's Responsibility with Running Machine - Correct Answer-If the machine is
running, the engineer should not leave the building.
Emergency Power Testing Frequency - Correct Answer-Emergency power testing must
be done monthly.
AB29 Certificate of Fitness Holder's Responsibility - Correct Answer-The holder should
inspect the battery system.
Gauge Reading for Chilled Water System - Correct Answer-A gauge reading of
saturation pressure of refrigerant with chilled water as the cooling medium estimates the
temperature of the chilled water being pumped to the spaces being cooled.
Refrigerant Escape Awareness - Correct Answer-In the event of a refrigerant escape,
the engineer should be aware of asphyxiation.
Chemical Fire Extinguisher and System Requirement - Correct Answer-A chemical fire
extinguisher and system are needed where water is not sufficient.
Refrigerants Inside Machine Gauges - Correct Answer-The refrigerants found inside the
machine gauges are the same type as the refrigerant inside the machine.
Fireproof Decorations Purpose - Correct Answer-Fireproof decorations in buildings are
used so they don't catch fire in an emergency.
Water Regulating Valves Usage - Correct Answer-Water regulating valves are used to
maintain condenser pressure to a predetermined level.
Steam Turbine Warm-up Time - Correct Answer-It takes 10 to 15 minutes to warm up a
steam turbine.
Pressure Relief Out vs. Fusible Plugs - Correct Answer-A pressure relief out is better
than fusible plugs to minimize refrigerant loss.
Hot Work Near Sprinkler Head - Correct Answer-To prevent the fire alarm system from
going off, put a non-combustible barrier to protect the sprinkler.
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Inspection of Sprinkler Heads - Correct Answer-Automatic sprinkler heads need
inspecting.
Filter Driers Function - Correct Answer-Filter driers remove moisture and particles.
Action for Unsatisfied Building in Chilled Water System - Correct Answer-If one building
is not satisfied, put in an additional chilled water pump online.
PSIA Conversion from HG - Correct Answer-If 29.92 HG = 14.7 PSIA, then 26" HG
converts to 12.77 PSIA.
Turbine Speed Measurement Device - Correct Answer-The device used to measure the
speed of a turbine is a tachometer.
Charge in TEV Sensing Bulb - Correct Answer-The charge in TEV sensing bulb is
similar to the refrigerant in this system.
Cooling Tower Cooling Medium - Correct Answer-The cooling medium for a cooling
tower is water
Cost Calculation for Operating a 5 Horsepower Motor - Correct Answer-The equivalent
energy consumption of a 5 horsepower motor operating for 9 hours is 33.6 kilowatt
hours.
Refrigerant/Temperature Chart Conversion - Correct Answer-If the chart indicates a
Celsius temperature of 5ﾟ, the equivalent in Fahrenheit is 41ﾟ.
Centrifugal Chiller Start-up Procedure - Correct Answer-Start the chilled water pump,
then start the condenser water pump, check oil, start cooling tower, and start
compressor.
Circuit Breaker Function - Correct Answer-A circuit breaker has a similar function as a
fuse.
Standpipe Out of Service Fire Watch Duration - Correct Answer-If a standpipe system
will be out of service for 2 days, there should be fire watch the entire time the standpipe
is out of service.
Water Supply for Multi Zone Building - Correct Answer-Each zone in a multi-zone
building will have its own automatic water supply.
Service Valve for Isolating Dual Pressure Relief Valve - Correct Answer-A 3-way valve
should be installed to isolate dual pressure relief valve while keeping the system in
service.
FDNY
FDNY Z51 Exam Study Guide 2025
Engineer's Minimum Reading Log Requirement - Correct Answer-An engineer needs to
log readings once per shift.
Phase 2 Firemen Service - Correct Answer-The elevator operator is the only person that
can control the elevator.
Engineer's Responsibility with Running Machine - Correct Answer-If the machine is
running, the engineer should not leave the building.
Emergency Power Testing Frequency - Correct Answer-Emergency power testing must
be done monthly.
AB29 Certificate of Fitness Holder's Responsibility - Correct Answer-The holder should
inspect the battery system.
Gauge Reading for Chilled Water System - Correct Answer-A gauge reading of
saturation pressure of refrigerant with chilled water as the cooling medium estimates the
temperature of the chilled water being pumped to the spaces being cooled.
Refrigerant Escape Awareness - Correct Answer-In the event of a refrigerant escape,
the engineer should be aware of asphyxiation.
Chemical Fire Extinguisher and System Requirement - Correct Answer-A chemical fire
extinguisher and system are needed where water is not sufficient.
Refrigerants Inside Machine Gauges - Correct Answer-The refrigerants found inside the
machine gauges are the same type as the refrigerant inside the machine.
Fireproof Decorations Purpose - Correct Answer-Fireproof decorations in buildings are
used so they don't catch fire in an emergency.
Water Regulating Valves Usage - Correct Answer-Water regulating valves are used to
maintain condenser pressure to a predetermined level.
Steam Turbine Warm-up Time - Correct Answer-It takes 10 to 15 minutes to warm up a
steam turbine.
Pressure Relief Out vs. Fusible Plugs - Correct Answer-A pressure relief out is better
than fusible plugs to minimize refrigerant loss.
Hot Work Near Sprinkler Head - Correct Answer-To prevent the fire alarm system from
going off, put a non-combustible barrier to protect the sprinkler.
FDNY
, FDNY
Inspection of Sprinkler Heads - Correct Answer-Automatic sprinkler heads need
inspecting.
Filter Driers Function - Correct Answer-Filter driers remove moisture and particles.
Action for Unsatisfied Building in Chilled Water System - Correct Answer-If one building
is not satisfied, put in an additional chilled water pump online.
PSIA Conversion from HG - Correct Answer-If 29.92 HG = 14.7 PSIA, then 26" HG
converts to 12.77 PSIA.
Turbine Speed Measurement Device - Correct Answer-The device used to measure the
speed of a turbine is a tachometer.
Charge in TEV Sensing Bulb - Correct Answer-The charge in TEV sensing bulb is
similar to the refrigerant in this system.
Cooling Tower Cooling Medium - Correct Answer-The cooling medium for a cooling
tower is water
Cost Calculation for Operating a 5 Horsepower Motor - Correct Answer-The equivalent
energy consumption of a 5 horsepower motor operating for 9 hours is 33.6 kilowatt
hours.
Refrigerant/Temperature Chart Conversion - Correct Answer-If the chart indicates a
Celsius temperature of 5ﾟ, the equivalent in Fahrenheit is 41ﾟ.
Centrifugal Chiller Start-up Procedure - Correct Answer-Start the chilled water pump,
then start the condenser water pump, check oil, start cooling tower, and start
compressor.
Circuit Breaker Function - Correct Answer-A circuit breaker has a similar function as a
fuse.
Standpipe Out of Service Fire Watch Duration - Correct Answer-If a standpipe system
will be out of service for 2 days, there should be fire watch the entire time the standpipe
is out of service.
Water Supply for Multi Zone Building - Correct Answer-Each zone in a multi-zone
building will have its own automatic water supply.
Service Valve for Isolating Dual Pressure Relief Valve - Correct Answer-A 3-way valve
should be installed to isolate dual pressure relief valve while keeping the system in
service.
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