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

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

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

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

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

One cause of high head pressure occurring in a refrigeration system can be （）.

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 （）.

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

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

The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.