單項選擇題

Continuous surging of turbocharger can be caused by（）
①crash stop of engine
②increased back pressure after T-Ch
③fouled or damaged turbine nozzle ring

A.all are correct
B.②and③are correct
C.none of the above is correct
D.①only is correct


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1.單項選擇題When occurring a fire in the scavenge air box, the following measures should be taken except for（）

A.reducing speed to SLOW and asking bridge for permission to stop
B.stopping the fuel oil supply
C.switching-on the auxiliary blowers
D.putting the scavenge air box fire extinguishing equipment into function

2.單項選擇題On what do you depend having the air cooler of main engine chemically washed?（）

A.increased air pressure differenced before and aft air cooler
B.reduced exhaust temperature in all cylinders
C.reduced temperature difference between water inlet and outlet
D.both A and C

3.單項選擇題In a four stroke engine, which process lasts the longest period?（）

A.exhaust and suction process
B.suction and compression process
C.combustion and exhaust process
D.working and exhaust process

4.單項選擇題In the two stroke diesel engine, it is designed so that the oil impingement is timed to proceed only on the piston ring belt during（）

A.compression stroke
B.suction stroke
C.expansion stroke
D.exhaust stroke

5.單項選擇題One advantage of a flash distilling plant when compared to a submerged tube distiller is（）

A.greater distillate purity through high temperature evaporation
B.cold shocking for scale removal is not required
C.less internal corrosion because of lower brine density
D.less feed-water is required for equal plant capacity