單項選擇題The reason why more and more of the large merchant vessels are being powered by medium-speed diesel engines is （）.

A.they operate between 150 and 450 rpm
B.they are connected to the propeller by gearing
C.their smaller size and weight
D.they can be connected directly to the propeller without gearing


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1.單項選擇題The diesel engine is similar to the gasoline engine in that （）.

A.both of them are ignited by compressed air
B.both of them are the forms of external combustion engines
C.both of them have spark plugs
D.the power is developed by the piston in the cylinder

3.單項選擇題If （） are taken at regular intervals, any unequal distribution of load will be easily found out.

A.indicator diagrams
B.nomo-gram
C.temperature readings
D.pressure readings

4.單項選擇題If the action of the engine indicates that some of the cylinders are not firing, the ones affected may be determined by watching （）.

A.the bad smoke
B.the smoky exhaust
C.the exhaust temperature
D.the peak pressure