单项选择题
A.refrigerant overcharge B.overfeeding by the expansion valve C.a restricted suction strainer D.due to short cycling of the compressor
If the viscosity of the liquid being transferred remain...
单项选择题If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
A.capacity will increase B.capacity will decrease C.suction pressure will increase D.suction pressure will decrease
On tank vessels equipped with power operated cargo tank...
单项选择题On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
A.hydraulic B.electric C.steam D.diesel
When a refrigeration compressor has developed a high he...
单项选择题When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
A.increase the amount of cooling water to the condenser B.decrease the amount of cooling water to the condenser C.add more refrigerant to the system D.remove some refrigerant from the system
