A.low water level
B.low oil pressure
C.excessively high fuel pressure
D.an improper air/fuel ratio
您可能感興趣的試卷
你可能感興趣的試題
A.Condenser leakage
B.A shortage of liquid refrigerant
C.Excessive frost on the evaporator
D.Not enough condenser cooling water
A.high discharge pressure
B.frosting of the crankcase
C.high temperature of the overboard water
D.low suction pressure of compressor
A.upper part of the receiver
B.upper part of the condenser
C.down stream end of the cooling coil
D.outlet end of the condenser
A.icing of the automatic controls
B.embrittlement of some parts of the automatic controls
C.sludge in the lubricating oil
D.all of the above
A.low water level
B.high water level
C.excessively high fuel pressure
D.low oil temperature
最新試題
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
A pressure drop through the refrigerant liquid line may cause （）.
The major source of chemical contaminants in hydraulic fluid is （）.
If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
The usual symptoms of cavitation in a centrifugal pump is （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）