海船船员考试
单选题If a compressor runs continuously, the cause might be a（）A defective thermal bulbB clogged scale trapC stuck high-pressure switchD stuck low-pressure switch
题目
defective thermal bulb
clogged scale trap
stuck high-pressure switch
stuck low-pressure switch
相似问题和答案
第1题：
Badly leaking refrigeration compressor discharge valves will cause ______.
A.overfeeding of the expansion valve
B.damage to the condenser
C.constant running of the compressor
D.flooding of the receiver
第2题：
Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause______.
A.carbon deposits on the compressor suction valves
B.the evaporator temperature to increase
C.rapid corrosion of the thermal expansion valve
D.no operating problems
第3题：
If the refrigeration compressor crankcase is sweating, the cause may be due to
A.a shortage of refrigerant
B.the compressor running continuously
C.liquid refrigerant returning to the compressor
D.the compressor short cycling on the high pressure cutout
第4题：
system was overcharged with refrigerant
high pressure switch was improperly adjusted
expansion valve strainers were fouled
suction valves were leaking slightly
第5题：
Shortage of refrigerant oil
Slight shortage of refrigerant
Excessive condenser cooling water flow
Faulty expansion valve
第6题：
If the suction pressure for an operating refrigeration compressor is below normal, the cause may be ______.
A.an excess of liquid refrigerant
B.the expansion valve overfeeding
C.a fouled compressor suction strainer
D.the compressor short cycling
第7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
第8题：
Excessive oil foaming in the crankcase of a refrigeration compressor is most likely to occur when the compressor
A.has run continuously for a long period
B.suction pressure is below normal
C.oil level is below normal
D.starts after a long idle period
第9题：
Closing of the solenoid valve
Closing of the expansion valve
An increase in the suction pressure
Decreasing the suction pressure
第10题：
system was overcharged with refrigerant
system was low on refrigerant
suction valves were leaking slightly
relief valve was leaking slightly