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 （）.

The rate of heat transfer from a hot region to a cold region is affected most by the （）.

The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?（）

A pressure drop through the refrigerant liquid line may cause （）.

An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.

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

Thermostatic expansion valves can be adjusted for （）.

The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.

A grease gun is generally used to lubricate a （）.