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

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

If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.

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

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

A salinity indicator is used to determine the （）.

Thermostatic expansion valves can be adjusted for （）.

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

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

The rate of heat transfer from a hot region to a cold region is affected most by the （）.