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

If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.

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

If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.

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

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

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

A salinity indicator is used to determine the （）.

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?（）