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If a reciprocating air compressor has a knock occurring in f

题目
单选题
If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably （）.
A

misalignment or worn main bearings

B

insufficient cylinder lubrication

C

defective or poorly fitted valves

D

all of the above

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相似问题和答案

第1题：

In a chilled(冷的) water air conditioning unit using a reciprocating compressor, the refrigerating effect of the primary refrigerant can be increased by ______.

A.increasing refrigerant pressure in the coil

B.increasing chilled water flow through the cooler

C.sub-cooling the refrigerant in the condenser

D.superheating the refrigerant in the compressor


正确答案：C

第2题：

What is the most probable cause of reduced capacity in a reciprocating air compressor ________．

A.Carbon on cylinder heads

B.Faulty unloader

C.Leaking air valves

D.Plugged air cooler


正确答案：C

第3题：

what is the use of “unloader “on main air compressor ?


正确答案：The unloader on air compressor is used to reduce the high starting torqueduring starting and also provide a means of draining out the accumulating oil water .

第4题：

单选题
The unloading system on an air compressor will （）.
A

increase compressor discharge pressure on demand

B

increase compressor operating speed as necessary

C

allow the motor to turn the compressor opposed only by friction

D

reduce the compressor frictional load when starting


正确答案： C
解析： 暂无解析

第5题：

单选题
The sudden reduction of pressure occurring within the crankcase of a refrigeration compressor during starting causes the （）.
A

sudden evaporation of wax crystals in the lubricant

B

sudden evaporation of entrapped air in the lubricant

C

release of refrigerant from the oil/refrigerant mixture

D

release of dissolved lubricant from the refrigerant


正确答案： B
解析： 暂无解析

第6题：

Sludge may be formed in the oil in the crankcase of a reciprocating air conditioning compressor as a result of ______.

A.refrigerant bubbles in the lube oil

B.refrigerant reducing the lube oil viscosity

C.oxidation(氧化) of the lube oil from overheating

D.reducing the floc or cloud point of the oil


正确答案：C

第7题：

单选题
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


正确答案： B
解析： 暂无解析

第8题：

If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably _____.

A.misalignment or worn main bearings

B.insufficient cylinder lubrication

C.defective or poorly fitted valves

D.All of the above


正确答案：A

第9题：

单选题
Air blowing from the intake air filter of an operating air compressor indicates （）.
A

broken inlet valves

B

broken discharge valves

C

pulsations in the air distribution system

D

overloading of the air distribution system


正确答案： A
解析： 暂无解析

第10题：

单选题
In an air conditioning system, low head pressure associated with a reciprocating compressor can be the result of （）
A

broken valve springs

B

tight drive belts

C

high line voltage

D

air in the system


正确答案： A
解析： 暂无解析

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