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

The usual symptoms of cavitation in a centrifugal pump is （）.

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

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

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

Thermostatic expansion valves can be adjusted for （）.

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

The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?（）

A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.

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