FDNY Z-51 2026/2027 ACTUAL
QUESTIONS WITH VERIFIED
ANSWERS.
A multi cylinder reciprocating compressor uses cylinder
unloaders to regularly capacity what would not occur if
some of the unloaders fail to operate when needed
The chill water temperature will increase
Of the following centrifugal refrigeration machine his best
characterized by
High volume low pressure machine
Modern compresses usually sealed the rotating shaft as it
exit the compressor housing a Spring loaded seal made of
Metal or carbon
The British thermal unit BTU is a measurement of heat of
energy if 10 be to you a transfer to 10 pounds of water the
water temperature increase will be closest to
1ﾟF
The Flash point of compressor lubricating oil
Should be higher than the compression temperature
The most common reason for refrigeration engineer to use
a psychrommeter is to measure
Relatively humidity level of the atmosphere
,Under normal conditions the refrigerant enters the
Compressor as a
Low pressure superheated vapor and leaves as a high
pressure of vapor
What is the function of the vacuum breaker in a steam
turbine
To achieve a faster coast down cycle
An equalizer line on TXV is used for
Compensate for the pressure drop across the evaporator coil
In a multistage and a typical compressor each stage Is
Identicle in volume to the other stages
In relation to the suction pressure of a compressor the
reading of the oil pressure gauge should read in a range
closer to
15 to 30 PSI above the suction pressure
The advantage of a forced draft cooling tower over natural
draft cooling tower is
Smaller tower size
A system controlled by ATXV shows high discharge
pressure and normal subcooling the causes most probably
a
Refrigerant overcharge
A refrigeration engineer is logging readings from a
reciprocating system. Compressor discharge temperature
has dropped significantly and the suction line pressure is
high. what may be causing this:
An expansion valve that is open to wide
, A solenoid valve is used to allow reciprocating
refrigeration machine to adapt to the load on the system
the opening of the solenoid valve is caused by
Electrical current creating a magnetic field
A water chiller is equipped with a reciprocating
compressor a thermostat expansion valve and a
condenser a restriction into refrigerant liquid line would
result in
High suction superheat
The most important reason to Sub-cool refrigerant in the
condenser is to ensure a :
A pure liquid refrigerant will enter the device
How would you put an additional pump online
Open suction valve open discharge valve gradually
The packing gland of a centrifugal compressor serves to:
The drip part of packing gland shows evidence that there is
water in the pump
A chilled water system uses refrigerant 134-a if theres a
leak in the evaporator shell may result in
Setting off the refrigerant monitor alarm
The most important requirement for a good evaporator is
It must have enough cooling surface to absorb the required
heat
The type of refrigerant that is least likely to leak refrigerant
into the building space that are being cooled:
The Indirect system
QUESTIONS WITH VERIFIED
ANSWERS.
A multi cylinder reciprocating compressor uses cylinder
unloaders to regularly capacity what would not occur if
some of the unloaders fail to operate when needed
The chill water temperature will increase
Of the following centrifugal refrigeration machine his best
characterized by
High volume low pressure machine
Modern compresses usually sealed the rotating shaft as it
exit the compressor housing a Spring loaded seal made of
Metal or carbon
The British thermal unit BTU is a measurement of heat of
energy if 10 be to you a transfer to 10 pounds of water the
water temperature increase will be closest to
1ﾟF
The Flash point of compressor lubricating oil
Should be higher than the compression temperature
The most common reason for refrigeration engineer to use
a psychrommeter is to measure
Relatively humidity level of the atmosphere
,Under normal conditions the refrigerant enters the
Compressor as a
Low pressure superheated vapor and leaves as a high
pressure of vapor
What is the function of the vacuum breaker in a steam
turbine
To achieve a faster coast down cycle
An equalizer line on TXV is used for
Compensate for the pressure drop across the evaporator coil
In a multistage and a typical compressor each stage Is
Identicle in volume to the other stages
In relation to the suction pressure of a compressor the
reading of the oil pressure gauge should read in a range
closer to
15 to 30 PSI above the suction pressure
The advantage of a forced draft cooling tower over natural
draft cooling tower is
Smaller tower size
A system controlled by ATXV shows high discharge
pressure and normal subcooling the causes most probably
a
Refrigerant overcharge
A refrigeration engineer is logging readings from a
reciprocating system. Compressor discharge temperature
has dropped significantly and the suction line pressure is
high. what may be causing this:
An expansion valve that is open to wide
, A solenoid valve is used to allow reciprocating
refrigeration machine to adapt to the load on the system
the opening of the solenoid valve is caused by
Electrical current creating a magnetic field
A water chiller is equipped with a reciprocating
compressor a thermostat expansion valve and a
condenser a restriction into refrigerant liquid line would
result in
High suction superheat
The most important reason to Sub-cool refrigerant in the
condenser is to ensure a :
A pure liquid refrigerant will enter the device
How would you put an additional pump online
Open suction valve open discharge valve gradually
The packing gland of a centrifugal compressor serves to:
The drip part of packing gland shows evidence that there is
water in the pump
A chilled water system uses refrigerant 134-a if theres a
leak in the evaporator shell may result in
Setting off the refrigerant monitor alarm
The most important requirement for a good evaporator is
It must have enough cooling surface to absorb the required
heat
The type of refrigerant that is least likely to leak refrigerant
into the building space that are being cooled:
The Indirect system
