海船船员考试
单选题Foaming of the oil in a refrigeration compressor crankcase is caused by （）.A refrigerant boiling out of solution from the lube oilB liquid refrigerant flooding the compressor and systemC lube oil viscosity being reduced by refrigerant dilutionD compres
题目
refrigerant boiling out of solution from the lube oil
liquid refrigerant flooding the compressor and system
lube oil viscosity being reduced by refrigerant dilution
compressor suction pressure suddenly increasing
参考答案和解析
相似问题和答案
第1题：
Sweating of the refrigeration system compressor crankcase is caused by_______ .
A.too much superheat
B.insufficient superheat
C.suction pressure too low
D.excessive refrigerant returning to the compressor
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：
insufficient lube oil circulating through the system
excessive circulation of lube oil through the system
insufficient refrigerant in the system
an overworked compressor
第5题：
sudden evaporation of wax crystals in the lubricant
sudden evaporation of entrapped air in the lubricant
release of refrigerant from the oil/refrigerant mixture
release of dissolved lubricant from the refrigerant
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
第7题：
damage to the un-loader operating diaphragm
an increase in current flow to the motor
high pressure in the receiver and filter
an excessive consumption of crankcase oil
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：
a shortage of refrigerant in the system
air in the system
an accumulation of liquid refrigerant in the crankcase
a shortage of oil in the crankcase
第10题：
add refrigerant to the system
adjust the thermal expansion valve to the proper setting
adjust the float valve to the proper holding pressure
open the hand expansion valve