单项选择题

As the designated rudder angle is being achieved, as a result of the original command input, the steering gear follow-up mechanism is（）

A.in motion, providing a null input
B.not in motion, thus providing a null input
C.in motion, providing an input to place the main pump on maximum stroke
D.in motion, providing an input to place the main pump at null stroke

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单项选择题

In a fixed displacement axial piston hydraulic motor, the speed is varied by（）

A.regulating the ratio between torque and speed via the torque limiter at the motor
B.directing the motor output flow through a bypass line
C.maintaining a constant flow and pressure input
D.controlling the input flow rate

单项选择题

In a shell-and-tube type hydraulic fluid cooler, the amount of heat transferred from the hydraulic fluid to the cooling water depends upon（）

A.the temperature of the hydraulic fluid
B.the flow rate of the hydraulic fluid
C.the temperature of the cooling water
D.all of the above

单项选择题

An orifice-check valve placed in a hydraulic system is used to（）

A.regulate the fluid flow in either direction
B.restrict movement of hydraulic fluid in one direction, but allow free movement in the other direction
C.allow free movement of hydraulic fluid in both directions
D.allow a restricted fluid flow in one direction only