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Q-01 FDNY (Electrical Engineering) STUDY EXAM QUESTIONS AND ANSWERS A
An atmospheric line on an indicator card from the head of a doubleacting, single stage horizontal ammonia compressor is used
(A) to record piston stroke.
(B) to record volumetric efficiency.
(C) to record compressor superheat.
(D) as a pressure reference or standard.
Correct Answer -(D) as a pressure reference or standard.
A compressor may lose oil if
(A) there is air in the system
(B) the velocity of refrigerant in the risers is too low.
(C) there are medium pressure drops in the evaporator.
(D) There are small load variations in the system.
Correct Answer -(B) the velocity of refrigerant in the risers is too low.
When charging, the best way to determine the quantity of refrigerant in
the system is to
(A) open the petcock on the liquid receiver.
(B) weigh the cylinder charge of the refrigerant.
(C) feel the temperature charge of the receiver shell.
(D) put a gas meter on the liquid line.
Correct Answer -(B) weigh the cylinder charge of the refrigerant.
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