FDNY Z51 RMO 2026 QUESTIONS AND ANSWERS
RATED A+
✔✔What is the primary reason ribbed metal piping is used for electrical wires connected
to the refrigeration system shown below - ✔✔It allows for flexibility and accounts for
vibrations
✔✔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 multi States and 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 30PSI above suction pressure
✔✔The vantage 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
✔✔One gallon of water weighs 8.33 pounds - ✔✔
✔✔A water chiller is equipped with a reciprocating compressor a thermostat expansion
valve and an air cooled condenser a restriction into refrigerant liquid line would result in
- ✔✔High suction superheat
✔✔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
✔✔How would you put an additional pump online - ✔✔Open suction valve open
discharge valve gradually
✔✔A chilled water system uses refrigerant 134 a leak in the evaporator shell may result
in - ✔✔Set 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
✔✔ - ✔✔
✔✔ - ✔✔
✔✔ - ✔✔
✔✔ - ✔✔
RATED A+
✔✔What is the primary reason ribbed metal piping is used for electrical wires connected
to the refrigeration system shown below - ✔✔It allows for flexibility and accounts for
vibrations
✔✔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 multi States and 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 30PSI above suction pressure
✔✔The vantage 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
✔✔One gallon of water weighs 8.33 pounds - ✔✔
✔✔A water chiller is equipped with a reciprocating compressor a thermostat expansion
valve and an air cooled condenser a restriction into refrigerant liquid line would result in
- ✔✔High suction superheat
✔✔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
✔✔How would you put an additional pump online - ✔✔Open suction valve open
discharge valve gradually
✔✔A chilled water system uses refrigerant 134 a leak in the evaporator shell may result
in - ✔✔Set 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
✔✔ - ✔✔
✔✔ - ✔✔
✔✔ - ✔✔
✔✔ - ✔✔
