When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.

If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.

Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.

Which of the following statements is correct concerning heat transfer?（）

An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.

If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.

If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should （）.

A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.

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

The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.