MET230: Hydraulics and Pneumatics Unit 2 Review Assignment 1 Solution

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This document provides a comprehensive solution to a Hydraulics and Pneumatics assignment, specifically Unit 2 Review Assignment 1 for the MET230 course. The assignment covers a range of topics, including hydraulic motors (limited rotation, gear, volumetric efficiency), hydraulic valves (directional control, pressure relief), and related calculations. The solution includes detailed answers to multiple-choice questions testing understanding of key concepts and principles. Furthermore, it provides step-by-step solutions to several problems involving rotary actuators, hydraulic motor performance, and hydraulic transmissions. These problems require calculations for speed, torque, horsepower, and flow rates. Additionally, the document addresses the functionality of pressure relief valves, orifice flow measurements, and the analysis of hydraulic cylinder systems. The solution demonstrates the application of relevant formulas and principles to solve practical engineering problems within hydraulic systems. The document concludes with references, supporting the validity of the solution.
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MET230: Hydraulics and Pneumatics
Unit 2 Review Assignment 1
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Question 1
Which of the following statements is true about limited rotation hydraulic motors?
A. They are also called non-oscillating motors
B. They can’t rotate in the counter clockwise direction
C. They are classified as linear actuators
D. They rotate through less than one complete cycle
E. None of the above
Question 2
Which of the following statements lists the main advantages of gear motors?
A. Long expected life and zero maintenance
B. Highest volumetric and mechanical efficiencies
C. Simple design and subsequent low cost
D. High speed and high torque
E. None of the above
Question 3
Which of the following statements define the volumetric efficiency of a hydraulic motor?
A. Volumetric efficiency is the theoretical flow rate the motor should consume, divided by the
actual flow rate consumed by the motor.
B. Volumetric efficiency is the actual torque delivered by the motor, divided by the torque the
motor should theoretically deliver.
C. Volumetric efficiency is the actual power delivered by the motor, divided by the actual power
delivered to the motor.
D. There is no such thing as volumetric efficiency for a motor. This concept applies to pumps only
E. None of the above
Question 4
Which of the following is NOT true about hydraulic motors?
A. A motor uses more flow than it theoretically should
B. A hydraulic motor delivers less torque than it theoretically should
C. Hydraulic motors extract energy from a fluid and convert it to mechanical energy
D. In vane motors, vanes are held in contact with the cam ring by springs or by being pressure-
loaded
E. None of the above
Question 5
Which of the following is NOT true about hydraulic valves?
A. Directional control valves determine the path of a fluid in a given circuit
B. Pilot check valves can permit flow in the normally blocked opposite direction
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C. A pressure relief valve is used to limits the maximum pressure in a hydraulic system
D. Pressure reducing valve is another name for pressure relief valve
E. All of the above
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Problem 1
A rotary actuator has the following physical data:
Outer radius of rotor = 0.75 in
Outer radius of vane = 1.5 in
Width of vane = 0.75 in
If the torque load is 1000 inlb, what pressure must be developed to overcome the load?
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Problem 2
A hydraulic motor has 5.5-in3 volumetric displacement. If it has a pressure rating of 1500 psi and
receives oil from a 12.5-gpm theoretical flow-rate pump, find the motor
a. Speed
b. Theoretical torque
c. Theoretical horsepower
Solution
Speed
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Theoretical torque
Theoretical horsepower
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Problem 3
A hydraulic motor has a displacement of 140 cm3 and operates with a pressure of 110 bars and a speed
of 1800 rpm. If the actual flow rate consumed by the motor is 0.0048 m3/s and the actual torque
delivered by the motor is 210 Nm, find
a. ηv
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b. ηm
c. ηo
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d. kW power delivered by the motor
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Problem 4
A hydraulic transmission operating at 110-bars pressure has the following characteristics
__________________________________________
Pump motor____
VD = 95 cm3 VD = ?
ηv = 82% ηv = 95%
ηm = 88% ηm = 93%
N = 900 rpm N = 550 rpm__
Find the
a. Displacement of the motor
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