FDNY Z51 RMO EXAM 2025
QUESTIONS WITH DETAILED
VERIFIED ANSWERS
"The Primary Way Of Achieving Capacity Control Of A An Centrifugal
Compressor Is By: - Correct Answer=> Adjustment To The Inlet Impeller Pre
Rotation Vanes"
"Regarding The Functioning Of A Steam Turbine, Why Is It Advisable To Keep
Moisture In The Inlet Low As Possible - Correct Answer=> Keeps Turbine
Blades Wear To Minimum"
"A Water Chiller Is Equipped With A Reciprocating Compressor, A
Thermostatic Expansion Valve And A An Air Cooled Condenser. A Restriction
In The Refrigerant Line Would Result In - Correct Answer=> High Suction
Super Heat"
"The Process By Which Refrigerant Is Extracted And Cleaned For Reuse
Without Requirements For Reclamation Is Called - Correct Answer=>
Recycle"
"The Purpose Of Wear Rings In A Centrifugal Pump Is To - Correct Answer=>
Prevent Wearing Of The Pump Housing And Impeller"
"A Centrifugal Compressor Is In Operation With Suction Pressure Is 3 Psig
And The Discharge Is 10psi What Is The Atmospheric Pressure Is 14.7 Which
Is The Ratio Closest To - Correct Answer=> 1.39"
"Electrical Current Us Measured In - Correct Answer=> Amperage"
1|Page
, "How Would You Put An Additional Pump Online - Correct Answer=> Open
Suction Valve, Open Discharge Valve Gradually"
"Of The Following, The Major Advantage Of A Shell And Coil Condenser Is -
Correct Answer=> There Is Less Danger Of Developing Leaks"
"An Engineer Needs To Vary The Flow Of Refrigerant In A Refrigeration
System, Which Operation In The Flow Of The System Does Not Include -
Correct Answer=> Solenoid Valve"
"Thermal Bull Is Attached To The Suction Plate Between The Evaporator Cokl
And The Compressor By An Insulated Line. Assume That The Machine Room
Is 85deg F . Break Down Of The Insulation Results In: - Correct Answer=>
Flood The Evaporator"
"Water And Moisture Is Serious Problem In A Refrigerant System How To
Avoid - Correct Answer=> Proper Evaluation At The Charging Of The
System"
"While On Duty A Refrigeration Engineer Notic That The Suction Line To The
Compressor And Part Of The Compressor Itself Is Frosted Over The
Following The Most Likely Reason For This Condition Would Be - Correct
Answer=> There Is Not Enough Refrigerant In The System"
"While Doing A Routine Inspection The Engineer Notices The Bulb Of The
Txv On The Floor. The Refrigerant Engineer Should Have Attached A Bulb At
The - Correct Answer=> The Outlet End Of The Coil"
"A Refrigerant Engineer Verifies That A Chilled Water Pump Is Cavity To Of
The Following The Most Likely Cause For This Condition Is - Correct
Answer=> Water Leaks Through The Mechanical Seals"
2|Page
QUESTIONS WITH DETAILED
VERIFIED ANSWERS
"The Primary Way Of Achieving Capacity Control Of A An Centrifugal
Compressor Is By: - Correct Answer=> Adjustment To The Inlet Impeller Pre
Rotation Vanes"
"Regarding The Functioning Of A Steam Turbine, Why Is It Advisable To Keep
Moisture In The Inlet Low As Possible - Correct Answer=> Keeps Turbine
Blades Wear To Minimum"
"A Water Chiller Is Equipped With A Reciprocating Compressor, A
Thermostatic Expansion Valve And A An Air Cooled Condenser. A Restriction
In The Refrigerant Line Would Result In - Correct Answer=> High Suction
Super Heat"
"The Process By Which Refrigerant Is Extracted And Cleaned For Reuse
Without Requirements For Reclamation Is Called - Correct Answer=>
Recycle"
"The Purpose Of Wear Rings In A Centrifugal Pump Is To - Correct Answer=>
Prevent Wearing Of The Pump Housing And Impeller"
"A Centrifugal Compressor Is In Operation With Suction Pressure Is 3 Psig
And The Discharge Is 10psi What Is The Atmospheric Pressure Is 14.7 Which
Is The Ratio Closest To - Correct Answer=> 1.39"
"Electrical Current Us Measured In - Correct Answer=> Amperage"
1|Page
, "How Would You Put An Additional Pump Online - Correct Answer=> Open
Suction Valve, Open Discharge Valve Gradually"
"Of The Following, The Major Advantage Of A Shell And Coil Condenser Is -
Correct Answer=> There Is Less Danger Of Developing Leaks"
"An Engineer Needs To Vary The Flow Of Refrigerant In A Refrigeration
System, Which Operation In The Flow Of The System Does Not Include -
Correct Answer=> Solenoid Valve"
"Thermal Bull Is Attached To The Suction Plate Between The Evaporator Cokl
And The Compressor By An Insulated Line. Assume That The Machine Room
Is 85deg F . Break Down Of The Insulation Results In: - Correct Answer=>
Flood The Evaporator"
"Water And Moisture Is Serious Problem In A Refrigerant System How To
Avoid - Correct Answer=> Proper Evaluation At The Charging Of The
System"
"While On Duty A Refrigeration Engineer Notic That The Suction Line To The
Compressor And Part Of The Compressor Itself Is Frosted Over The
Following The Most Likely Reason For This Condition Would Be - Correct
Answer=> There Is Not Enough Refrigerant In The System"
"While Doing A Routine Inspection The Engineer Notices The Bulb Of The
Txv On The Floor. The Refrigerant Engineer Should Have Attached A Bulb At
The - Correct Answer=> The Outlet End Of The Coil"
"A Refrigerant Engineer Verifies That A Chilled Water Pump Is Cavity To Of
The Following The Most Likely Cause For This Condition Is - Correct
Answer=> Water Leaks Through The Mechanical Seals"
2|Page
