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

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 （）.

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

Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）

If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should （）.

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

The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.

Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.

Thermostatic expansion valves can be adjusted for （）.