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

Thermostatic expansion valves can be adjusted for （）.

Which of the following statements is correct concerning heat transfer?（）

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

Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.

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（）.

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