單項(xiàng)選擇題

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

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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

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

你可能感興趣的試題

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

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