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

The major source of chemical contaminants in hydraulic fluid is （）.

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

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

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

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

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

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

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 （）.

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?（）