Machine Dynamics Questions and Answers – Controlling Force Diagram for a Spring-controlled Governor

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This set of Machine Dynamics Multiple Choice Questions & Answers (MCQs) focuses on “Controlling Force Diagram for a Spring-controlled Governor”.

1. Let r represent the radius of rotation, then for stability of a spring controlled governor, which of the following relation regarding controlling force is true? (a, b are constants)
a) Fc = ar-b
b) Fc = ar +b
c) Fc = ar
d) Fc = a
View Answer

Answer: a
Explanation: The relation between the controlling force (FC) and the radius of rotation (r) for the stability of spring controlled governors is given by the following equation:
Fc = ar-b.
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2. If the line intersects the Controlling force axis in positive direction in the controlling force diagram of the spring controlled governor, then it is stable.
a) True
b) False
View Answer

Answer: b
Explanation: If the line intersects the Controlling force axis in negative direction in the controlling force diagram of the spring controlled governor, then it is stable.
Fc = ar-b

3. Let r represent the radius of rotation, then for an unstable spring controlled governor, which of the following relation regarding controlling force is true? (a,b are constants)
a) Fc = ar-b
b) Fc = ar +b
c) Fc = ar
d) Fc = a
View Answer

Answer: b
Explanation: The relation between the controlling force (FC) and the radius of rotation (r) for the unstability of spring controlled governors is given by the following equation:
Fc = ar+b.

4. Let r represent the radius of rotation, then for an isochronous spring controlled governor, which of the following relation regarding controlling force is true? (a,b are constants)
a) Fc = ar-b
b) Fc = ar +b
c) Fc = ar
d) Fc = a
View Answer

Answer: c
Explanation: The relation between the controlling force (FC) and the radius of rotation (r) for the instability of spring controlled governors is given by the following equation:
Fc = ar.
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5. In the given figure x axis is the radius of rotation and y axis is the controlling force, identify the correct option.
machine-dynamics-questions-answers-controlling-force-diagram-spring-controlled-governor-q5
a) Curve represents isochronous governor
b) Curve represents stable governor
c) Curve represents unstable governor
d) Curve represents sensetive governor
View Answer

Answer: a
Explanation: In the given figure, the straight line is passing through the origin thus following a relation
Fc = ar. Since there are no constants it represents an isochronous governor.

6. In the given figure x axis is the radius of rotation and y axis is the controlling force, identify the correct option. (For a spring controlled governor)
machine-dynamics-questions-answers-controlling-force-diagram-spring-controlled-governor-q6
a) Curve represents isochronous governor
b) Curve represents stable governor
c) Curve represents unstable governor
d) Curve represents sensetive governor
View Answer

Answer: b
Explanation: In the given figure, the straight line is below the axis representing the controlling force thus following a relation
Fc = ar – b. Since there is a negative constant it represents a stable governor.

7. In the given figure x axis is the radius of rotation and y axis is the controlling force, identify the correct option. (For a spring controlled governor)
machine-dynamics-questions-answers-controlling-force-diagram-spring-controlled-governor-q7
a) Curve represents isochronous governor
b) Curve represents stable governor
c) Curve represents unstable governor
d) Curve represents sensetive governor
View Answer

Answer: c
Explanation: In the given figure, the straight line is above the axis representing the controlling force thus following a relation
Fc = ar + b. Since there is a negative constant it represents an unstable governor.
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8. It is possible that the equilibrium speed of the governor decreases with an increase of the radius of rotation of balls.
a) True
b) False
View Answer

Answer: b
Explanation: If the equilibrium speed of the governor decreases with an increase of the radius of rotation of balls then Fc/r decreases as r increases. This is impracticable.

Sanfoundry Global Education & Learning Series – Machine Dynamics.

To practice all areas of Machine Dynamics, here is complete set of 1000+ Multiple Choice Questions and Answers.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn