单项选择题

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

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单项选择题

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

单项选择题

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

单项选择题

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