A.Shortage of refrigerant oil
B.Slight shortage of refrigerant
C.Excessive condenser cooling water flow
D.Faulty expansion valve
第1题
In discussing oil pollution, one important fact to remember is that the problem remains the same( )heavy( )light oil is spilled into the water.
A.both/and
B.whether/or
C.neither/nor
D.because/so
第2题
High firing pressures and low exhaust temperature in a diesel engine may resultfrom( ).
A.decreased piston to cylinder head clearance
B.increased exhaust system back pressure
C.early fuel injection timing
D.low scavenge air temperature
第3题
Any increase in the exhaust back pressure of a four-stroke/cycle diesel enginewill( ).
A.reduce engine horsepower output
B.aid in silencing the exhaust noise
C.increase the mean effective pressure
D.contribute to effective cylinder scavenging
第4题
An indication of an overloaded main propulsion diesel engine is( ).
A.white smoke in the exhaust
B.high exhaust gas pyrometer readings
C.sparks in the exhaust
D.blue smoke in the exhaust
为了保护您的账号安全,请在“上学吧”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!