單項(xiàng)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


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1.單項(xiàng)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

2.單項(xiàng)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

3.單項(xiàng)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

4.單項(xiàng)選擇題A distorted spray pattern from a fuel injector can cause a diesel engine to have （）

A.higher firing pressure
B.more power output
C.lower fuel pressure
D.less power output

5.單項(xiàng)選擇題Why are some diesel engine cylinder liners plated on the wearing surface with porous chromium?（）

A.The chromium will not wear out the piston rings
B.The chromium strengthens the liners in the way of the scavenging air ports
C.Chromium eliminates the need for oil scraper rings
D.Pores in the plating aid in maintaining the lube oil film