If a refrigeration compressor were short cycling on the low

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

If a refrigeration system were short of refrigerant, the condition would result in

A.continuous running of the compressor

B.high suction pressure

C.high discharge pressure

D.short cycling of the compressor on the water failure switch

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

The sensing line for the low pressure cutout switch to a refrigeration system is located ______.

A.in the chill box(冰箱)

B.before the receiver

C.on the suction side of the compressor

D.on the discharge side of the compressor

In the refrigeration system, a shortage of refrigerant is indicated by

A.the compressor short cycling on high pressure cut out switch

B.high suction pressure

C.high head pressure

D.bubbles in the sight glass

If the suction pressure at the refrigeration compressor is below normal, the cause can be

A.refrigerant overcharge

B.overfeeding by the expansion valve

C.a restricted suction strainer

D.due to short cycling of the compress

If a refrigeration compressor is short cycling on high head pressure, you should

A.purge the condenser if the waterside is dirty

B.check for proper water flow through the condenser

C.increase the high pressure cutout setting

D.reduce the cooling water flow

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