單項(xiàng)選擇題Air motion is induced in a four-stroke/cycle diesel engine cylinder to improve air fuel mixing, and is known as（）

A.supercharging
B.scavenging
C.turbulence
D.swept volume charging


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1.單項(xiàng)選擇題Which of the following statements is correct concerning diesel engine cooling water systems?（）

A.Each engine must have its own engine driven cooling water pump capable of providing cooling for all ranges of operation
B.propulsion engines with bores exceeding 200 mm are to be fitted with a means to display the cooling water temperature of each cylinder
C.At least two independent sea suctions are to be provided for supplying water to the engine jackets or to the heat exchangers
D.Suitable strain are to be fitted between the circulating pumps and heat exchangers when sea water is used for direct cooling

2.單項(xiàng)選擇題In a full flow type lube oil system, the bypass relief valve will lift due to （）

A.a clogged filter element
B.excessive lube oil pump discharge pressure
C.excessive lube oil flow
D.excessively hot lube oil

3.單項(xiàng)選擇題In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by （）

A.improper venting of the cooling system
B.carrying the expansion tank water level too high
C.a totally clogged impeller in the cooling water pump
D.an incorrectly set cooling system temperature control

4.單項(xiàng)選擇題A dirty lube oil strainer can result in（）

A.crankcase
B.low lube oil temperature
C.excessive oil consumption
D.low bearing oil pressure

5.單項(xiàng)選擇題Differential needle valves used in fuel injectors are directly closed by（）

A.cam action
B.spring force
C.fuel oil pressure
D.firing pressure