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

An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.

Thermostatic expansion valves can be adjusted for （）.

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

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

The output volume of a positive fixed displacement pump can be changed only by （）.

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

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