單項(xiàng)選擇題An increased differential between the inlet and outlet of a strainer usually indicates the strainer is （）

A.holed
B.fouled
C.clean
D.dry


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1.單項(xiàng)選擇題Trunk type diesel engine pistons are effectively cooled when heat is（）

A.radiated through the engine block
B.transferred to water cooled cylinder walls
C.conducted through the piston crown
D.transferred to escaping exhaust gases

2.單項(xiàng)選擇題Maintaining the proper fuel oil temperature will result in （）

A.the elimination of valve wear
B.improved atomization
C.a decrease in cylinder blow-by
D.an increase in cylinder blow-by

3.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

4.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

5.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