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

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

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 （）.

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

When the steering gear is in operation, you should （）.

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

An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.

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

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