题目内容（请给出正确答案）

[主观题]

Excessive oil foaming in the crankcase of a refrigeration compressor at start up can cause

_____.

A.compressor damage from improper lubrication

B.refrigerant absorption by the lubricant

C.increased viscosity in the lubricant

D.carbon deposit on the compressor suction valves

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更多“Excessive oil foaming in the c…”相关的问题

第1题

Excessive lube oil consumption can result from worn or broken ______________.A.piston ring

Excessive lube oil consumption can result from worn or broken ______________.

A.piston rings

B.valve guides

C.valve seals

D.all of the above

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第2题

Excessive lube oil consumption by a reciprocating air compressor can be caused by _____.A.

Excessive lube oil consumption by a reciprocating air compressor can be caused by _____.

A.using a slightly dirty air filter

B.using oil having an excessive viscosity

C.intercooler or after-cooler leaks

D.carrying the oil level higher than normal

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第3题

If a used lube oil analysis indicates excessive chromate content, this meansA.air filtrati

If a used lube oil analysis indicates excessive chromate content, this means

A.air filtration is inadequate

B.engine coolant is leaking into the lube oil

C.fuel oil is leaking into the lube oil

D.the piston rings are excessive worn

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第4题

Excessive piston ring wear in a diesel engine will cause ____________.A.high lube oil visc

Excessive piston ring wear in a diesel engine will cause ____________.

A.high lube oil viscosity

B.increased lube oil consumption

C.low lube oil temperatures

D.high firing pressures

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第5题

The main function of piston compression rings is to _______.A.prevent excessive cylinder l

The main function of piston compression rings is to _______.

A.prevent excessive cylinder liner wear

B.reduce friction losses in the engine

C.seal the space between the piston and the liner

D.limit upward flow of lube oil into the combustion space

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第6题

When the steering gear is in operation, you should ______.A.check hydraulic oil levels eve

When the steering gear is in operation, you should ______.

A.check hydraulic oil levels every hour

B.check the rams for overheating

C.check for excessive oil leakage from rams

D.drain water from tele-motor cylinders each watch

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第7题

Which of the following conditions can cause excessive lube oil consumption in a diesel engine？

A.Low lube oil temperature

B.Dirty lube oil strainer

C.Low lube oil pressure

D.High lube oil temperature

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第8题

If a used lube oil analysis indicates an excessive chromate content, this means .A.air fil

If a used lube oil analysis indicates an excessive chromate content, this means .

A.air filtration is inadequate

B.engine coolant leaking into the lube oil

C.fuel oil is leaking into the lube oil

D.the piston rings are excessively worn

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第9题

Excessive lubricating oil consumption in a running diesel engine can be caused by ________

A.clogged lube oil piping

B.excessive valve-guide clearance

C.high lube oil viscosity

D.low lube oil temperature

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第10题

A diesel engine fails to start due to excessive water in the fuelBefore the engine can be started, the water should be removed from the__________.

A.fuel lines

B.lube oil filter

C.crank case pump

D.rocker arm reservoir

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第11题

What condition will result in the automatic shutdown of a diesel engine？（）

A. High jacket water pressure

B. High lube oil pressure

C. Low lube oil pressure

D. Excessive turbo charger speed

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