單項選擇題If a single cylinder relief valve on a main propulsion diesel engine begins to lift, but it is not possible to secure the engine, which of the following actions should be taken?（）

A.Increase the cooling water flow to the engine
B.Secure or reduce fuel to that cylinder
C.Screw down on the pressure adjusting spring to decrease to decrease popping pressure
D.Readjust the injection timing


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1.單項選擇題Which of the following statements concerning fuel atomization in a diesel engine cylinder is correct?（）

A.The greater the atomization, the greater the penetration
B.The greater the atomization, the less the penetration
C.The degree of atomization has nothing to do with the degree of penetration
D.Atomization and penetration are one and the same

2.單項選擇題If a tow-stroke/diesel engine is over-speeding due to leakage of lube oil into the cylinders, what should you do to stop the engine?（）

A.Move the fuel control mechanism to the no fuel position
B.Block the fuel supply by closing the master fuel valve
C.Shut off the fuel supply and block the flow of intake air
D.Relieve all pressure in the fuel system

3.單項選擇題The breaking-up of fuel as it enters a diesel engine cylinder is known as（）

A.airification
B.vaporization
C.atomization
D.gasification

4.單項選擇題The exhaust ports of a diesel engine using the cross-flow scavenging method are opened and closed by the （）

A.reciprocating motion of exhaust valves
B.rotary motion of the camshaft
C.reciprocating motion of the piston
D.developed differential

5.單項選擇題When fuel enters the crankcase of a diesel engine, it （）

A.dilutes the lube oil and reduces its viscosity
B.forms sulfuric acid in the lube oil
C.causes pitting and failure of the bearings
D.causes sludge deposits on valve stems