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

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

相关考题

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