A.使用无线网络设备的默认设置
B.禁止SSID广播
C.进行安全认证设置,如设置密钥
D.启用“防Ping功能”
E.设置IP地址过滤和MAC地址过滤
第1题
A.a shortage of refrigerant in the system
B.air in the system
C.an accumulation of liquid refrigerant in the crankcase
D.a shortage of oil in the crankcase
第2题
Crankcase sweating in a refrigeration system is caused by _____.
A.a stuck solenoid valve
B.a shortage of refrigerant
C.too much oil in circulation
D.too much superheat
第4题
Low compressor head pressure in a refrigeration system can be caused by ___.
A.insufficient condenser cooling water
B.excessive condenser cooling water
C.air in the refrigeration system
D.excessive refrigerant in the system
第5题
A.A shortage of liquid refrigerant.
B.Excessive frost on the evaporator.
C.Excessive condenser cooling water.
D.Insufficient condenser cooling water flow.
第6题
Refrigerant is circulated through a refrigeration system by the _____.
A.compressor
B.condenser
C.expansion valve
D.evaporator
第7题
Moisture in a refrigeration system can cause _____.
A.freezing the expansion valve closed
B.corrosion of system piping
C.improper temperature regulation
D.all of the above
第8题
Zinc rods are installed in the refrigeration system .
A.liquid strainer
B.liquid receiver
C.saltwater condenser
D.evaporator
第9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10题
The refrigerant leaves the evaporator of a refrigeration system as a low pressure _____.
A.sub-cooled liquid
B.high temperature liquid
C.oil saturated liquid
D.superheated vapor
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