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

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

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

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

Low compressor head pressure in a refrigeration system can be caused by（）.

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 （）.

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?（）

When the steering gear is in operation, you should （）.

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

The major source of chemical contaminants in hydraulic fluid is （）.