Z-51 Written Test Exam (Latest Update 2026)
UPDATE!! (Recent exam) Fully solved & updated
2026 Most TESTED (2026 -2027
Wet chemical fire extinguishing systems are commonly installed to
protect
A) commercial cooking equipment.
B) flammable liquid storing rooms.
C) com outer rooms.
D) battery rooms.
A) commercial cooking equipment.
, An electrically operated control requires 24 volts to operate. To
change the available 110 volts to 24 volts requires a
A) rectifier.
B) transformer.
C) low-temperature wire.
D) step-down capacitor.
B) transformer.
If resistance is cut in half, what happens to the power factor?
A) Increases by a factor of two.
B) Decreases by a factor of two.
C) Gets cut by half.
D) Increases by two.
A) Increases by a factor of two.
,Which of the following personnel is qualified to supervise the
inspection, testing and maintenance of emergency power systems?
A) A F-01 CoF holder.
B) A S-95 CoF holder.
C) A Q-01 CoF holder.
D) Anyone who is designated by the building owner.
C) A Q-01 CoF holder.
The most important reason to use at least two compressors in a
cascade system is to
A) avoid the need for a water-cooled condenser.
B) divide the cooling load between the compressors.
C) accomplish higher temperature.
D) avoid very high compression ratio for each compressor.
D) avoid very high compression ratio for each compressor.
Where must the Material Safety Data Sheets be located?
A) Where any toxic material is used.
B) Near the entrance to the machine room.
C) Where flammable liquids are used.
D) Where available to all employees.
D) Where available to all employees.
, If a sprinkler system is offline for two days, how often do you need
to inspect until it is returned to service?
A) 12-hours a day until system is restored.
B) Continuously, 24-hours a day until system is restored.
C) Only in the evening, until restored.
D) Only in the morning, until restored.
B) Continuously, 24-hours a day until system is restored.
Where is the muffler located?
A) After the condenser.
B) Before the compressor.
C) Between the evaporator and condenser.
D) Between the compressor and condenser.
D) Between the compressor and condenser.
On an operating centrifugal compressor refrigerant unit, the
refrigeration engineer notices that the compressor is short-cycling.
The unit is using the low-side float valve as a metering device. Of
the following requirements, this would indicate that
A) the system is undercharged with refrigerant.
B) the system is overcharged with refrigerant.
C) an inspection should be made for a dirty and partially plugged
discharge line.
D) the compressor wiring should be inspected.
A) the system is undercharged with refrigerant.
UPDATE!! (Recent exam) Fully solved & updated
2026 Most TESTED (2026 -2027
Wet chemical fire extinguishing systems are commonly installed to
protect
A) commercial cooking equipment.
B) flammable liquid storing rooms.
C) com outer rooms.
D) battery rooms.
A) commercial cooking equipment.
, An electrically operated control requires 24 volts to operate. To
change the available 110 volts to 24 volts requires a
A) rectifier.
B) transformer.
C) low-temperature wire.
D) step-down capacitor.
B) transformer.
If resistance is cut in half, what happens to the power factor?
A) Increases by a factor of two.
B) Decreases by a factor of two.
C) Gets cut by half.
D) Increases by two.
A) Increases by a factor of two.
,Which of the following personnel is qualified to supervise the
inspection, testing and maintenance of emergency power systems?
A) A F-01 CoF holder.
B) A S-95 CoF holder.
C) A Q-01 CoF holder.
D) Anyone who is designated by the building owner.
C) A Q-01 CoF holder.
The most important reason to use at least two compressors in a
cascade system is to
A) avoid the need for a water-cooled condenser.
B) divide the cooling load between the compressors.
C) accomplish higher temperature.
D) avoid very high compression ratio for each compressor.
D) avoid very high compression ratio for each compressor.
Where must the Material Safety Data Sheets be located?
A) Where any toxic material is used.
B) Near the entrance to the machine room.
C) Where flammable liquids are used.
D) Where available to all employees.
D) Where available to all employees.
, If a sprinkler system is offline for two days, how often do you need
to inspect until it is returned to service?
A) 12-hours a day until system is restored.
B) Continuously, 24-hours a day until system is restored.
C) Only in the evening, until restored.
D) Only in the morning, until restored.
B) Continuously, 24-hours a day until system is restored.
Where is the muffler located?
A) After the condenser.
B) Before the compressor.
C) Between the evaporator and condenser.
D) Between the compressor and condenser.
D) Between the compressor and condenser.
On an operating centrifugal compressor refrigerant unit, the
refrigeration engineer notices that the compressor is short-cycling.
The unit is using the low-side float valve as a metering device. Of
the following requirements, this would indicate that
A) the system is undercharged with refrigerant.
B) the system is overcharged with refrigerant.
C) an inspection should be made for a dirty and partially plugged
discharge line.
D) the compressor wiring should be inspected.
A) the system is undercharged with refrigerant.
