Exam (elaborations)

FDNY Z51 TEST EXAM ,Z51 WRITTEN TEST TAURIS AND A STUDY GUIDE EXAM 2024 VERSION 200 QUESTIONS WITH DETAILED VERIFIED ANSWERS AND RATIONALES /A+ GRADE ASSURED In a steam turbine, what is the function of a Kingsbury thrust bearing?

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FDNY Z51

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FDNY Z51

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FDNY Z51 TEST EXAM ,Z51 WRITTEN TEST TAURIS
AND A STUDY GUIDE EXAM 2024 VERSION 200
QUESTIONS WITH DETAILED VERIFIED ANSWERS
AND RATIONALES /A+ GRADE ASSURED
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. - CORRECT ANSWER-D) Maintain axial positioning of the
rotor shaft.

Hot work authorizations are issued by

A) a Responsible Person designated by the Building Owner.

B) a Building Department inspector.

C) a FDNY inspector.

D) the Building owner's insurance company. - CORRECT 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. - CORRECT ANSWER-C) may be toxic.

What is a compressor safety head?

A) Rupture disc.

B) A pressure relief valve on the low side.

C) Cylinder head with a low pressure relief on the high side.

D) A spring on the valve plate. - CORRECT ANSWER-

,The oil collected in an oil separator is generally

A) caused by an oil overcharge.

B) returned to the compressor.

C) filtered and returned to the compressor.

D) drained and replaced by fresh oil. - CORRECT ANSWER-

Where is emergency power not required according to code?

A) Fire pumps.

B) High rise elevators.

C) Egress illumination.

D) Data centers. - CORRECT ANSWER-D) Data centers.

Modern compressors usually seal the rotating shaft seal as it exits the compressor housing a spring-
loaded seal made of

A) low-friction plastic.

B) rubber.

C) metal or carbon.

D) graphite-loaded fiber. - CORRECT ANSWER-

A technician shows up to service the fire alarm panel in your building. What COF qualifications must
he/she have?

A) A Q-01/Q-99 Certificate of Qualification holder who is designated by the building owner.

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

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

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

Which statement is correct regarding a fusible plug on a condenser?

A) The melting point is marked on it.

B) Are not allowed by code.

C) Release refrigerant by pressure.

D) Can be back-seated. - CORRECT ANSWER-

In an office building, the display of cut natural trees (Christmas trees) is

A) never allowed.

B) allowed provided they are removed once they dry out.

C) always allowed.

D) allowed during the holiday season. - CORRECT ANSWER-A) never allowed.

Describe the equipment's function in the picture.

A) Control flow of refrigerant to the compressor.

B) Remove non-condensable from the condenser.

C) Relieve excess pressure from the condenser.

D) Relieve excess pressure from the evaporator. - CORRECT ANSWER-B) Remove non-condensable from
the condenser.

When the expansion valve is operating properly, the end of the evaporator will contain

A) only superheated vapor.

B) saturated liquid refrigerant

C) only vapor.

D) only liquid refrigerant. - CORRECT ANSWER-A) only superheated vapor.

, How much extra refrigerant con be stored in a machine room?

A) 330 lbs.

B) The amount equal to the design pressure.

C) 20% above normal charge.

D) 220 lbs. - CORRECT ANSWER-C) 20% above normal charge.

A refrigeration compressor has failed to turn on. The refrigeration engineer on duty verifies that the
electrical circuit to the motor, including all switches and circuit breakers, is complete according to
recommended service practice. The next item to be checked would likely by the

A) temperature and pressure controls.

B) refrigerant charge.

C) cooling tower operation.

D) liquid-line solenoid valve. - CORRECT ANSWER-A) temperature and pressure controls.

The use of oil in the refrigeration machine is to

A) Add non-condensates to refrigerant.

B) Mix the oil with liquid refrigerant.

C) Reduce wear and friction in compressor parts.

D) None of the answers are correct. - CORRECT ANSWER-C) Reduce wear and friction in compressor
parts.

The heat removed from the refrigerant condenser is

A) latent heat only.

B) sensible heat only.

C) sensible and latent heat.

D) Radiant heat only. - CORRECT ANSWER-C) sensible and latent heat.

Which service valve should be installed in a dual pressure release valve while keeping system in service?

A) Two-way valve.

B) Plug valve.

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FDNY Z51 TEST EXAM ,Z51 WRITTEN TEST TAURIS AND A STUDY GUIDE EXAM 2024 VERSION 200 QUESTIONS WITH DETAILED VERIFIED ANSWERS AND RATIONALES /A+ GRADE ASSURED In a steam turbine, what is the function of a Kingsbury thrust bearing?

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