Page 1 of 77
Z-51 Written Test Newest 2025 Actual Exam| Complete
150 Real Exam Questions and Correct Detailed Answers
(Verified Answers) Already Graded A+|| New!!
In a steam turbine, what is the function of a Kingsbury thrust
bearing?
A) Maintain first stage steam pressure.
B) Compensate for coupling misalignment.
C) Adjust shaft torque at start up.
D) Maintain axial positioning of the rotor shaft.
.....ANSWER..... D) Maintain axial positioning of the rotor shaft.
The ratio of actual pressure of water pressure in the atmosphere
to the saturated pressure of given temperature is
,Page 2 of 77
A) partial pressure.
B) relative humidity.
C) humidity effect.
D) absolute humidity. .....ANSWER.....
The total amount of heat to be removed from the refrigerant in a
condenser equals the heat picked up in the
A) evaporator plus the heat of compression.
B) evaporator.
C) evaporator plus the heat of included non-condensable.
D) evaporator less the heat given up in the muffler.
.....ANSWER.....
When must the Fire Department be notified that a fire protection
system is out of service?
,Page 3 of 77
A) The manual pull alarm station in the lobby will be out of
service for 4 hours.
B) Four sprinkler heads on a same floor of your building will be
out of service for 2 hours.
C) The sprinkler system will be out of service on 1st and 2nd
floors.
D) The fire alarm system is out of service in the refrigerating
system room for g hours. .....ANSWER..... C) The sprinkler system
will be out of service on 1st and 2nd floors.
Hot work authorizations are issued by
A) a Responsible Person designated by the Building Owner.
B) a Building Department inspector.
C) a FDNY inspector.
, Page 4 of 77
D) the Building owner's insurance company. .....ANSWER..... A) a
Responsible Person designated by the building owner.
Insecticidal fogging operations are hazardous because chemicals
A) are corrosive.
B) are water-reactive.
C) may be toxic.
D) are highly unstable. .....ANSWER..... C) may be toxic.
What is a compressor safety head?
A) Rupture disc.
Where is emergency power not required according to code?
A) Fire pumps.
Z-51 Written Test Newest 2025 Actual Exam| Complete
150 Real Exam Questions and Correct Detailed Answers
(Verified Answers) Already Graded A+|| New!!
In a steam turbine, what is the function of a Kingsbury thrust
bearing?
A) Maintain first stage steam pressure.
B) Compensate for coupling misalignment.
C) Adjust shaft torque at start up.
D) Maintain axial positioning of the rotor shaft.
.....ANSWER..... D) Maintain axial positioning of the rotor shaft.
The ratio of actual pressure of water pressure in the atmosphere
to the saturated pressure of given temperature is
,Page 2 of 77
A) partial pressure.
B) relative humidity.
C) humidity effect.
D) absolute humidity. .....ANSWER.....
The total amount of heat to be removed from the refrigerant in a
condenser equals the heat picked up in the
A) evaporator plus the heat of compression.
B) evaporator.
C) evaporator plus the heat of included non-condensable.
D) evaporator less the heat given up in the muffler.
.....ANSWER.....
When must the Fire Department be notified that a fire protection
system is out of service?
,Page 3 of 77
A) The manual pull alarm station in the lobby will be out of
service for 4 hours.
B) Four sprinkler heads on a same floor of your building will be
out of service for 2 hours.
C) The sprinkler system will be out of service on 1st and 2nd
floors.
D) The fire alarm system is out of service in the refrigerating
system room for g hours. .....ANSWER..... C) The sprinkler system
will be out of service on 1st and 2nd floors.
Hot work authorizations are issued by
A) a Responsible Person designated by the Building Owner.
B) a Building Department inspector.
C) a FDNY inspector.
, Page 4 of 77
D) the Building owner's insurance company. .....ANSWER..... A) a
Responsible Person designated by the building owner.
Insecticidal fogging operations are hazardous because chemicals
A) are corrosive.
B) are water-reactive.
C) may be toxic.
D) are highly unstable. .....ANSWER..... C) may be toxic.
What is a compressor safety head?
A) Rupture disc.
Where is emergency power not required according to code?
A) Fire pumps.
