单项选择题
Which bearing will carry the load on two small points diametrically opposite to each other?（）
A.Needle
B.Tapered roller
C.Roller
D.Ball
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相关考题
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单项选择题
Refrigeration system compressor crankcase sweating is an indication of （）.
A.insufficient lube oil circulating through the system
B.excessive circulation of lube oil through the system
C.insufficient refrigerant in the system
D.an overworked compressor -
单项选择题
Operating a rotary pump at speeds in excess of design requirements could cause（）.
A.decreased clearances between rotating parts
B.decreased slippage to the suction side of the pump
C.air binding in the discharge ports
D.erosion and excessive wear -
单项选择题
A refrigeration system compressor crankcase is sweating or unusually coldThis is an indication of（）.
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
