超星 - Chapter_4_Actuators

单选题

A cylinder displaces a 14 kN load at 0.85 m/s. If hydraulic fluid enters the cylinder at a rate of 45 mL/min and at a pressure of 40 MPa, what is the total efficiency of the system?()

A. 22%
B. 40%
C. 35%
D. 63%

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单选题

A cylinder displaces a 13 kN load at 0.85 m/s. If hydraulic fluid enters the cylinder at a rate of 45 L/min and at a pressure of 40 MPa, what is the total efficiency of the system?()

A. 25%
B. 42%
C. 63%
D. 37%

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单选题

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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单选题

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

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单选题

Low-torque high-speed motors are used in

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

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单选题

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

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单选题

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

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单选题

Motors used in high speed applications have

A. high torque with high speed
B. low torque with high speed
C. high torque with low speed
D. none of the above

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单选题

Which of the following is a type of low-torque high-speed motor?

A. radial piston motors
B. axial piston motors
C. bent axis motor
D. gear motor

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单选题

Which type of motion is transmitted by hydraulic actuators?

A. linear motion
B. rotary motion
C. both a and b
D. none of the above

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