海船船员考试

单选题A reciprocating air compressor is running roughly and vibrating excessively, indicating that the （）.A compressor is overloadedB motor is overloadedC foundation bolts are looseD belts are too tight

题目
单选题
A reciprocating air compressor is running roughly and vibrating excessively, indicating that the （）.
A

compressor is overloaded

B

motor is overloaded

C

foundation bolts are loose

D

belts are too tight

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相似问题和答案

第1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2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
（）are supplied by main switchboard directly.
A

Suez Canal searchlight, air compressor and air conditioning compressor

B

Air compressor, boiler blower and refrigeration plant

C

Boiler blower, Suez Canal searchlight and refrigeration plant

D

Suez canal searchlight, air compressor and boiler blower


正确答案： C
解析： 暂无解析

第5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6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7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8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9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

第10题：

单选题
Broken valve strips in an operating low pressure, air compressor will cause （）.
A

an immediate crankcase explosion

B

oil contamination in the compressed air

C

a decrease in compressor capacity

D

no immediate loss of the compressed air capacity


正确答案： A
解析： 暂无解析

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