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

The usual symptoms of cavitation in a centrifugal pump is （）.

On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.

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 （）.

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 （）.

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?（）

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

Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）

If the head pressure of a reciprocating refrigeration compressor is excessive, （）.