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

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

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

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

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

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

Thermostatic expansion valves can be adjusted for （）.

A pressure drop through the refrigerant liquid line may cause （）.

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

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