题目内容

The total efficiency of a hydraulic motor is usually equal to ().

A. volumetric efficiency × mechanical efficiency
B. volumetric efficiency × hydraulic efficiency
C. hydraulic efficiency × mechanical efficiency
D. volumetric efficiency × mechanical efficiency × hydraulic efficiency

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What is the function of hydraulic motor?1. hydraulic motor converts hydraulic oil under pressure into torque and angular displacement2. hydraulic motor converts hydraulic oil under pressure into force and linear displacement3. hydraulic motor converts hydraulic energy into mechanical energy4. hydraulic motor converts mechanical energy into hydraulic energy

A. 1 and 4
B. 1 and 3
C. 2 and 3
D. 2 and 4

Low-torque high-speed motors are used in

A. cranes
B. winches
C. fans
D. all the above

Which motor causes heavy loads due to its usage in order to move at constant lower speeds?

A. Low-torque high-speed motors
B. High-torque low-speed motors
C. both a and b
D. none of the above

Match the following group 1 items with group 2 items and select the correct option.1. Radial piston motor ------------------- A. Swash plate2. Axial piston motor -------------------- B. Crank shaft3. Gerotor motor------------------------ C.Low torque4. Vane motor--------------------------- D.Orbit

A. 1-B, 2-A, 3-D, 4-C
B. 1-A, 2-C, 3-B, 4-D
C. 1-C, 2- A, 3-B, 4-D
D. 1-B, 2-D, 3-A, 4-C