On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.

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?（）

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

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

Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）

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

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

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

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

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