單項選擇題Which of the following conditions will develop if the flow of ‘raw’ cooling water to diesel engine is obstructed?（）

A.Air will enter the cooling system
B.Carbon will plug the water cooled exhaust manifolds
C.The jacket water temperature will rise
D.The lube oil viscosity will increase


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1.單項選擇題Aburned exhaust valve may be detected by a higher than normal （）

A.firing pressure
B.exhaust temperature from a particular cylinder
C.cooling water temperature
D.compression pressure

2.單項選擇題

In a diesel engine, excessive cylinder liner wear will cause （）
Ⅰ.increased blow-by
Ⅱ.wear between the piston ring and groove

A.Ⅰonly is correct
B.Ⅱ only is correct
C.both Ⅰ and Ⅱ are correct
D.neither Ⅰ or Ⅱ are correct

3.單項選擇題If the operating element of a thermostatic valve installed in a diesel engine cooling system malfunctions, it may result in （）

A.a low level in the engine expansion tank
B.excessively high coolant pressure
C.improper temperatures
D.malfunctioning of the jacket water heater

4.單項選擇題Why is the ring belt narrower in diameter than the skirt of a piston designed for a diesel engine?（）

A.To allow for greater expansion due to higher operating temperature
B.To seal the cylinder against leakage of combustion gases
C.To provide an additional surface for oil cooling
D.To provide an additional strength for the crown and lower structure

5.單項選擇題The effective pump stroke of an individual port-and-helix fuel injection pump is determined by the （）

A.fuel delivery pressure
B.pump plunger diameter
C.plunger control rack position
D.total pump stroke