Download FDNY Z51 Study Guide 2024 Exam Questions: Fire Safety and Engineering and more Exams Building and Prefabrication in PDF only on Docsity!
FDNY Z51 STUDY GUIDE 2024 EXAM QUESTIONS ALL CORRECTLY SOLVED
"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."
"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."
"Emergency Power Testing Frequency - CORRECT ANSWER Emergency power testing must be
done monthly."
"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."
"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."
"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."
"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."
"Inspection of Sprinkler Heads - CORRECT ANSWER Automatic sprinkler heads need
inspecting."
"Inspection of Sprinkler Heads - CORRECT ANSWER Automatic sprinkler heads need
inspecting."
"Filter Driers Function - CORRECT ANSWER Filter driers remove moisture and particles."
"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."
"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."
"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."
"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."
"Effect of Clogged Air Louvers in Cooling Tower - CORRECT ANSWER If the air louvers below
the fans in an induced draft cooling tower become clogged, the result would be higher return water temperature."
"Effect of Clogged Air Louvers in Cooling Tower - CORRECT ANSWER If the air louvers below
the fans in an induced draft cooling tower become clogged, the result would be higher return water temperature."
"Device for Controlling Steam Turbine Speed - CORRECT ANSWER The device that
automatically controls the speed of a steam turbine is the governor valve."
"Device for Controlling Steam Turbine Speed - CORRECT ANSWER The device that
automatically controls the speed of a steam turbine is the governor valve."
"Acceptable Circumstances for Chaining and Exiting - CORRECT ANSWER It is never okay to
chain and exit."
"Acceptable Circumstances for Chaining and Exiting - CORRECT ANSWER It is never okay to
chain and exit."
"Heat Removal in Refrigerator Condenser - CORRECT ANSWER The heat removed from the
refrigerator in the condenser is sensible and latent heat."
"Heat Removal in Refrigerator Condenser - CORRECT ANSWER The heat removed from the
refrigerator in the condenser is sensible and latent heat."
"Refrigerant Withdrawal for Major Repair - CORRECT ANSWER When a refrigerator or unit is
being taken out of service for major repair, the refrigerant engineer must ensure the containers for refrigerant withdrawal are approved by the US Department of Transportation."
"Refrigerant Withdrawal for Major Repair - CORRECT ANSWER When a refrigerator or unit is
being taken out of service for major repair, the refrigerant engineer must ensure the containers for refrigerant withdrawal are approved by the US Department of Transportation."
"House Cylinder Unloaders Function - CORRECT ANSWER House cylinder unloaders work to
keep the suction valve opened while the compressor is in the return stroke."
"House Cylinder Unloaders Function - CORRECT ANSWER House cylinder unloaders work to
keep the suction valve opened while the compressor is in the return stroke."
"Efficiency Improvement for Centrifugal Compressor - CORRECT ANSWER A more efficient
centrifugal compressor operation results from lowering the condenser pressure."
"Efficiency Improvement for Centrifugal Compressor - CORRECT ANSWER A more efficient
centrifugal compressor operation results from lowering the condenser pressure."
"Refrigerant Cleaning System Installation - CORRECT ANSWER The installation of an inline
refrigerant cleaning system is advisable to remove impurities from the system."
"Refrigerant Cleaning System Installation - CORRECT ANSWER The installation of an inline
refrigerant cleaning system is advisable to remove impurities from the system."
"Fully Primed Centrifugal Water Pump - CORRECT ANSWER A centrifugal water pump is
considered to be fully primed when the pump is full of liquid."
"Refrigeration Compressor Failure Troubleshooting - CORRECT ANSWER If a refrigeration
compressor has failed to turn on, the next item to be checked would likely be the temperature and pressure controls."
"Refrigeration Compressor Failure Troubleshooting - CORRECT ANSWER If a refrigeration
compressor has failed to turn on, the next item to be checked would likely be the temperature and pressure controls."
"Refrigerant Latent Heat Comparison - CORRECT ANSWER Of the refrigerants in commercial
and industrial use, the highest latent heat and refrigerant effect is ammonia."
"Refrigerant Latent Heat Comparison - CORRECT ANSWER Of the refrigerants in commercial
and industrial use, the highest latent heat and refrigerant effect is ammonia."
"ASHRAE Refrigerant Safety Classification - CORRECT ANSWER The most toxic ASHRAE
refrigerant safety classification is b3, and the most flammable is a3."
"ASHRAE Refrigerant Safety Classification - CORRECT ANSWER The most toxic ASHRAE
refrigerant safety classification is b3, and the most flammable is a3."
"Procedure for Putting Additional Pump Online - CORRECT ANSWER To put an additional
pump online, open the suction valve and open the discharge valve gradually."
"Procedure for Putting Additional Pump Online - CORRECT ANSWER To put an additional
pump online, open the suction valve and open the discharge valve gradually."
"Advantage of Shell and Tube Condenser - CORRECT ANSWER The major advantage of a shell
and tube condenser is that there is less danger of developing leaks."
"Duration for Keeping Fire Alarm Log Book - CORRECT ANSWER A fire alarm log book must be
kept for 3 years."
"Least Likely Refrigerant System to Leak - CORRECT ANSWER An indirect system is the least
likely to leak refrigerant into the building space being cooled."
"Least Likely Refrigerant System to Leak - CORRECT ANSWER An indirect system is the least
likely to leak refrigerant into the building space being cooled."
"Reason for Using Psychrometer - CORRECT ANSWER The most common reason for a
refrigeration engineer to use a psychrometer is to measure the relative humidity level of the atmosphere."
"Reason for Using Psychrometer - CORRECT ANSWER The most common reason for a
refrigeration engineer to use a psychrometer is to measure the relative humidity level of the atmosphere."
"Function of Equalizer Line on TXV - CORRECT ANSWER The equalizer line on TXV is used to
compensate for the pressure drop across the evaporator coil."
"Function of Equalizer Line on TXV - CORRECT ANSWER The equalizer line on TXV is used to
compensate for the pressure drop across the evaporator coil."
"Function of High Side Float - CORRECT ANSWER A high side float is used to maintain a
constant level of refrigerant in the evaporator."
"Function of High Side Float - CORRECT ANSWER A high side float is used to maintain a
constant level of refrigerant in the evaporator."
"Function of Vacuum Breaker in Steam Turbine - CORRECT ANSWER The function of the
vacuum breaker in a steam turbine is to achieve a faster coast-down cycle."
"Function of Vacuum Breaker in Steam Turbine - CORRECT ANSWER The function of the
vacuum breaker in a steam turbine is to achieve a faster coast-down cycle."
"Function of Suction and Discharge Valve in Reciprocating Compressor - CORRECT ANSWER
The suction and discharge valve of the reciprocating compressor are mounted with the discharge valve on top of the valve plate and the suction valve below."
"Function of Suction and Discharge Valve in Reciprocating Compressor - CORRECT ANSWER
The suction and discharge valve of the reciprocating compressor are mounted with the discharge valve on top of the valve plate and the suction valve below."
"Function of Forced Draft Cooling Tower - CORRECT ANSWER The advantage of a forced draft
cooling tower over a natural draft cooling tower is a smaller tower size."
"Effect of Evaporator Shell Leak - CORRECT ANSWER A leak in the evaporator shell may result
in setting off the refrigerant monitor alarm for a chilled water system using refrigerant 134."
"Effect of Evaporator Shell Leak - CORRECT ANSWER A leak in the evaporator shell may result
in setting off the refrigerant monitor alarm for a chilled water system using refrigerant 134."
"Requirement for Good Evaporator - CORRECT ANSWER The most important requirement for
a good evaporator is that it must have enough cooling surface to absorb the required heat."
"Requirement for Good Evaporator - CORRECT ANSWER The most important requirement for
a good evaporator is that it must have enough cooling surface to absorb the required heat."
"Function of Middle Port on Gauge Manifold - CORRECT ANSWER The middle port on a gauge
manifold will connect to the vacuum pump."
"Function of Middle Port on Gauge Manifold - CORRECT ANSWER The middle port on a gauge
manifold will connect to the vacuum pump."
"Function of High Side Float - CORRECT ANSWER A high side float is used to maintain a
constant level of refrigerant in the evaporator."
"Function of High Side Float - CORRECT ANSWER A high side float is used to maintain a
constant level of refrigerant in the evaporator."
"Function of Vacuum Breaker in Steam Turbine - CORRECT ANSWER The function of the
vacuum breaker in a steam turbine is to achieve a faster coast-down cycle."
"Function of Vacuum Breaker in Steam Turbine - CORRECT ANSWER The function of the
vacuum breaker in a steam turbine is to achieve a faster coast-down cycle."
"Function of Suction and Discharge Valve in Reciprocating Compressor - CORRECT ANSWER
The suction and discharge valve of the reciprocating compressor are mounted with the discharge valve on top of the valve plate and the suction valve below."
"Function of Suction and Discharge Valve in Reciprocating Compressor - CORRECT ANSWER
The suction and discharge valve of the reciprocating compressor are mounted with the discharge valve on top of the valve plate and the suction valve below."
"Function of Forced Draft Cooling Tower - CORRECT ANSWER The advantage of a forced draft
cooling tower over a natural draft cooling tower is a smaller tower size."
"Function of Forced Draft Cooling Tower - CORRECT ANSWER The advantage of a forced draft
cooling tower over a natural draft cooling tower is a smaller tower size."
"Function of Solenoid Valve in Reciprocating Refrigeration Machine - CORRECT ANSWER A
solenoid valve is used to allow a reciprocating refrigeration machine to adapt to the load on the system, and the opening of the solenoid valve is caused by electrical current creating a magnetic field."
"Function of Solenoid Valve in Reciprocating Refrigeration Machine - CORRECT ANSWER A
solenoid valve is used to allow a reciprocating refrigeration machine to adapt to the load on the system, and the opening of the solenoid valve is caused by electrical current creating a magnetic field."
"Effect of Evaporator Shell Leak - CORRECT ANSWER A leak in the evaporator shell may result
in setting off the refrigerant monitor alarm for a chilled water system using refrigerant 134."
"Effect of Evaporator Shell Leak - CORRECT ANSWER A leak in the evaporator shell may result
in setting off the refrigerant monitor alarm for a chilled water system using refrigerant 134."
"Requirement for Good Evaporator - CORRECT ANSWER The most important requirement for
a good evaporator is that it must have enough cooling surface to absorb the required heat."
"Requirement for Good Evaporator - CORRECT ANSWER The most important requirement for
a good evaporator is that it must have enough cooling surface to absorb the required heat."
"Function of Middle Port on Gauge Manifold - CORRECT ANSWER The middle port on a gauge
manifold will connect to the vacuum pump."
"Function of Middle Port on Gauge Manifold - CORRECT ANSWER The middle port on a gauge
manifold will connect to the vacuum pump."
“Engineer's Minimum Reading Log Requirement - CORRECT ANSWER An engineer needs to
log readings once per shift."
"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."
"AB29 Certificate of Fitness Holder's Responsibility - CORRECT ANSWER The holder should
inspect the battery system."
"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."
"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."
"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."
"Thermostat Response to Sudden Temperature Drop - CORRECT ANSWER In a cold front with
a sudden drop in temperature, the thermostat will cause the solenoid valve to close, pump the compressor down, and shut down on low pressure."
"Thermostat Response to Sudden Temperature Drop - CORRECT ANSWER In a cold front with
a sudden drop in temperature, the thermostat will cause the solenoid valve to close, pump the compressor down, and shut down on low pressure."
"Steam Turbine Critical Speed - CORRECT ANSWER When a steam turbine reaches critical
speed, the turbine will vibrate violently."
"Steam Turbine Critical Speed - CORRECT ANSWER When a steam turbine reaches critical
speed, the turbine will vibrate violently."
"Suction Valve Usage in Semi-Hermetic Compressors - CORRECT ANSWER In most semi-
hermetic compressors, the suction valve is used to cool the motor."
"Suction Valve Usage in Semi-Hermetic Compressors - CORRECT ANSWER In most semi-
hermetic compressors, the suction valve is used to cool the motor."
"Refrigerant Flow Determination in Economizer - CORRECT ANSWER The amount of
refrigerant that flows through the orifices of an economizer is determined by the difference between the high side and low side pressure."
"Refrigerant Flow Determination in Economizer - CORRECT ANSWER The amount of
refrigerant that flows through the orifices of an economizer is determined by the difference between the high side and low side pressure."
"Cause of Condenser Pump Cavitation - CORRECT ANSWER If a refrigerant engineer verifies
that a condenser pump is cavitated, the most likely cause for this condition is a faulty cooling tower water level controller."
"Cause of Condenser Pump Cavitation - CORRECT ANSWER If a refrigerant engineer verifies
that a condenser pump is cavitated, the most likely cause for this condition is a faulty cooling tower water level controller."
"Operation of Expansion Valve - CORRECT ANSWER When an expansion valve is operating
properly, at the end of the evaporator will contain only superheated vapor."
"Operation of Expansion Valve - CORRECT ANSWER When an expansion valve is operating
properly, at the end of the evaporator will contain only superheated vapor."
"Fully Primed Centrifugal Water Pump - CORRECT ANSWER A centrifugal water pump is
considered to be fully primed when the pump is full of liquid."
"Cooling Medium for Indirect Refrigeration System - CORRECT ANSWER In an indirect
refrigeration system, glycol or any brine solution would not be used as a cooling medium for building spaces being cooled."
"Cooling Medium for Indirect Refrigeration System - CORRECT ANSWER In an indirect
refrigeration system, glycol or any brine solution would not be used as a cooling medium for building spaces being cooled."
"Centrifugal Compressor Capacity Control - CORRECT ANSWER The primary way of achieving
capacity control of a centrifugal compressor is by adjustment to the inlet impeller pre-rotation vanes."
"Centrifugal Compressor Capacity Control - CORRECT ANSWER The primary way of achieving
capacity control of a centrifugal compressor is by adjustment to the inlet impeller pre-rotation vanes."
"Advantage of Shell and Tube Condenser - CORRECT ANSWER The major advantage of a shell
and tube condenser is that there is less danger of developing leaks."
"Procedure After Recovering Liquid Refrigerant - CORRECT ANSWER After recovering liquid
refrigerant from a centrifugal chiller, the next step shall be to recover vapor."
"Procedure After Recovering Liquid Refrigerant - CORRECT ANSWER After recovering liquid
refrigerant from a centrifugal chiller, the next step shall be to recover vapor."
"Duration for Keeping Fire Alarm Log Book - CORRECT ANSWER A fire alarm log book must be
kept for 3 years."
"Function of Ruptured Disk for Low Pressure Centrifugal Refrigeration Machine - CORRECT
ANSWER The ruptured disk for a low pressure centrifugal refrigeration machine is normally
located on the compressor suction."
"Measurement of Heat Transfer in BTU - CORRECT ANSWER The British thermal unit (BTU) is a
measurement of heat or energy, and if 10 BTUs are transferred to 10 pounds of water, the water temperature increase will be closest to 1 ﾟ F."
"Measurement of Heat Transfer in BTU - CORRECT ANSWER The British thermal unit (BTU) is a
measurement of heat or energy, and if 10 BTUs are transferred to 10 pounds of water, the water temperature increase will be closest to 1 ﾟ F."
