單項(xiàng)選擇題Which of the following procedures should be carried out to permit the use of a crosshead engine with an inoperable after-cooler?（）

A.Bypass the after-cooler to operate at speed
B.Run at reduced speed until the cooler can be repaired or renewed
C.Switch to diesel fuel and run at full speed
D.Nothing need to be done due to the low heating value of heavy fuel


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1.單項(xiàng)選擇題If cooling water flow through the after-cooler is interrupted,the power output of a turbocharged diesel engine will drop because the （）

A.turbocharger will stall
B.density of the air charge will decrease
C.scavenge effect will increase
D.exhaust pressure will increase

2.單項(xiàng)選擇題The amount of fuel injection into a diesel engine cylinder by a unit injector, is controlled by（）

A.the firing pressure in the cylinder
B.a metering helix inside the pump
C.varying the physical length of the plunger stroke
D.varying the clearance between the injector cam and the injector rocker arm

3.單項(xiàng)選擇題Which of the following should always be checked prior to starting a diesel engine?（）

A.Air filters
B.Fuel oil strainers
C.Crank case oil level
D.Pyrometer readings

4.單項(xiàng)選擇題An after-cooler installed between the turbocharger and the cylinder air inlet （）

A.increases the density of the air
B.decrease the density of the air
C.increases the specific heat of the air
D.decreases the specific heat of the exhaust

5.單項(xiàng)選擇題Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because（）.

A.The direction of pressure on the journal in four-stroke engine is continuously
B.positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine
C.four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines
D.Low-stroke engines usually consume less lube oil than four-stroke engines