單項選擇題Higher than normal temperature air passing through the intake of a diesel engine will result in（）

A.greater overall efficiency
B.greater fuel economy
C.lower horsepower
D.lower compression ratio


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1.單項選擇題Air scavenging of a diesel engine cylinder（）

A.blows out the exhaust gases
B.supplies oxygen for combustion
C.cools the valves and cylinder walls
D.all of the above

2.單項選擇題The term diesel engine scavenging means（）

A.delivering more air into the cylinder than it would normally receive during an ordinary charging process
B.forcing the products of combustion out of the cylinder with the fresh air charge
C.collecting the air charge at the cleaner
D.combustion and expansion of hot gas

3.單項選擇題A diesel generator has just been paralleled with an AC turbo-generator, but the load can not be properly divided.This could be caused by（）

A.an incorrect diesel generator governor speed droop adjustment
B.a faulty reverse power relay within the main circuit breaker assembly
C.unsynchronized isochronous load distribution adjustments
D.a different speed setting on each unit

4.單項選擇題The process of scavenging a two-stroke/cycle diesel engine serves to（）

A.improve fuel flow volume
B.cool the exhaust valves
C.reduce the intake air charge density
D.increase the temperature of exhaust gases

5.單項選擇題Which of the listed bearing types is an example of a solid bearing?（）

A.Piston wrist pin bushing
B.turbine bearing
C.Spring bearing
D.Diesel engine main bearing