Which of the listed pumps is NOT a positive displacement pump?（）

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

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

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

The general purpose of a heat exchanger is to （）.

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 （）.

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

If the head pressure of a reciprocating refrigeration compressor is excessive, （）.

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