单项选择题
A refrigeration unit will tend to short cycle when operating （）.
A.under heavy loads
B.during hot gas defrost
C.under light loads
D.during starting conditions
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相关考题
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Which of the following problems could cause air to blow out through the inlet air filter of a running compressor?（）
A.Excessive compression in the cylinder
B.A broken intake valve
C.A dirty inlet filter element
D.An improperly adjusted discharge valve -
单项选择题
In which of the listed hydraulic systems will the installation of an oil cooler be necessary?（）
A.Constant tension mooring winch system
B.Hatch cover system
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单项选择题
Which of the following problems would be the probable cause for the faulty operation of a reciprocating air compressor suction valve?（）
A.Carbon build up in the piston ring belt
B.Faulty operation of a cylinder un-loader
C.Compressor operation in an area of high relative humidity
D.Lifting of intercooler rebel valve
