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 （）.

Low compressor head pressure in a refrigeration system can be caused by（）.

Which of the listed pumps is NOT a positive displacement pump?（）

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

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

Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）

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 （）.

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 （）.