An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.

If the head pressure of a reciprocating refrigeration compressor is excessive, （）.

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

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

Which of the following statements is correct concerning heat transfer?（）

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

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

When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.

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

The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.