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

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?（）

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

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

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

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

A salinity indicator is used to determine the （）.

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

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