If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.

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 （）.

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

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 （）.

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 （）.

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

A salinity indicator is used to determine the （）.