Z-51 Written Test QUESTIONS WITH ANSWERS

Z-51 Written Test QUESTIONS WITH
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ANSWERS

In a steam turbine, what is the function of a Kingsbury thrust
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bearing?


A) Maintain first stage steam pressure.
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B) Compensate for coupling misalignment.
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C) Adjust shaft torque at start up.
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D) Maintain axial positioning of the rotor shaft. - CORRECT
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ANSWERS ✔✔D) Maintain axial positioning of the rotor shaft.
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The ratio of actual pressure of water pressure in the atmosphere
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to the saturated pressure of given temperature is
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A) partial pressure.
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B) relative humidity.
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C) humidity effect.
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D) absolute humidity. - CORRECT ANSWERS ✔✔
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The total amount of heat to be removed from the refrigerant in a
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condenser equals the heat picked up in the
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A) evaporator plus the heat of compression.
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,B) evaporator.
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C) evaporator plus the heat of included non-condensable.
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D) evaporator less the heat given up in the muffler. - CORRECT
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ANSWERS ✔✔ |\




When must the Fire Department be notified that a fire protection
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system is out of service? |\ |\ |\ |\




A) The manual pull alarm station in the lobby will be out of
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service for 4 hours. |\ |\ |\




B) Four sprinkler heads on a same floor of your building will be
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out of service for 2 hours.
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C) The sprinkler system will be out of service on 1st and 2nd
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floors.
D) The fire alarm system is out of service in the refrigerating
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system room for g hours. - CORRECT ANSWERS ✔✔C) The
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sprinkler system will be out of service on 1st and 2nd floors.
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Hot work authorizations are issued by
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A) a Responsible Person designated by the Building Owner.
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B) a Building Department inspector.
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C) a FDNY inspector.
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D) the Building owner's insurance company. - CORRECT
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ANSWERS ✔✔A) a Responsible Person designated by the building
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owner.

,Insecticidal fogging operations are hazardous because chemicals
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A) are corrosive.
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B) are water-reactive.
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C) may be toxic.
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D) are highly unstable. - CORRECT ANSWERS ✔✔C) may be toxic.
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What is a compressor safety head?
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A) Rupture disc.
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B) A pressure relief valve on the low side.
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C) Cylinder head with a low pressure relief on the high side.
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D) A spring on the valve plate. - CORRECT ANSWERS ✔✔
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The oil collected in an oil separator is generally
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A) caused by an oil overcharge.
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B) returned to the compressor.
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C) filtered and returned to the compressor.
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D) drained and replaced by fresh oil. - CORRECT ANSWERS ✔✔
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Where is emergency power not required according to code?
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A) Fire pumps.
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, B) High rise elevators.
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C) Egress illumination.
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D) Data centers. - CORRECT ANSWERS ✔✔D) Data centers.
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Modern compressors usually seal the rotating shaft seal as it
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exits the compressor housing a spring-loaded seal made of
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A) low-friction plastic.
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B) rubber.|\




C) metal or carbon.
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D) graphite-loaded fiber. - CORRECT ANSWERS ✔✔
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A technician shows up to service the fire alarm panel in your
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building. What COF qualifications must he/she have?
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A) A Q-01/Q-99 Certificate of Qualification holder who is
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designated by the building owner. |\ |\ |\ |\




B) A certified Fire Safety Director who is designated by the
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building owner. |\




C) A S-95 Certificate of Fitness holder who is employed by a
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FDNY certified company. |\ |\




D) A S-97/S-98 Certificate of Fitness holder who is employed by a
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FDNY certified company. - CORRECT ANSWERS ✔✔D) A S-97/S-98
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Certificate of Fitness holder who is employed by a FDNY certified
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company.
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