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单选题
For any piston ring to operate smoothly without scuffing ,the ring must be （）.
A
of a material harder than the cylinder liner
B
properly lubricated
C
prevented from compressing
D
prevented from rotating during engine operation
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单选题The clearance volume for a single stage compressor is defined as the space created between the （）.A
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piston and head, including the space around the piston to the top of the upper ring and under the valves, with the piston at TDCC
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单选题Which of the following statements concerning cylinder liner wear is true?（）A
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TBOB
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MCR
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单选题If the back clearance of a piston ring is excessive,（）A
compression pressure in the cylinder will be higherB
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combustion gases will penetrate beneath the ring landD
piston side thrust will be increased
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单选题Which of the following conditions would cause carbon deposits to form in the piston ring belt of a diesel engine?（）A
faulty combustionB
excessive ring temperatureC
over lubricationD
all of the above
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