# Machine Dynamics Questions and Answers – Controlling Force Diagram for a Porter Governor

This set of Machine Dynamics Multiple Choice Questions & Answers focuses on “Controlling Force Diagram for a Porter Governor”.

1. The graph plotted between the controlling force of the governor and Radius of rotation is known as _______
a) Controlling force diagram
b) Radius of rotation diagram
c) Governor diagram
d) Sensitivity diagram
View Answer

Answer: a
Explanation: When the graph between the controlling force (FC) as ordinate and radius of rotation of the balls (r) as abscissa is drawn, then the graph obtained is known as controlling force diagram of the governor.

2. Controlling force is provided by spring and weight in the porter governor.
a) True
b) False
View Answer

Answer: b
Explanation: Controlling force is provided by the weight of the sleeve and ball in the porter governor and by the spring and the weight in Hartnell governor.

3. In the given figure, the x – axis represents radius of rotation and the y axis represents the controlling force. This graph is known as _________

a) Controlling force diagram of Porter governor
b) Controlling force diagram of Hartnell governor
c) Controlling force diagram of isochronous governor
d) Controlling force diagram of a general governor
View Answer

Answer: a
Explanation: The given figure is a plot between the controlling force and the radius of rotation, from the curve it is factually known that it represents the controlling force diagram of a porter governor.
advertisement
advertisement

4. What should be the stability condition for the angle made by OA and the x axis? (the x – axis represents radius of rotation and the y axis represents the controlling force.)

a) Angle must increase
b) Angle must decrease
c) Angle must remain constant
d) Stability is independent of this angle
View Answer

Answer: a
Explanation: In case the governor satisfies the condition for stability, the angle between OA and the x-axis must increase with the radius of rotation of the governor balls.

5. How should the equilibrium speed vary with the increase of radius of rotation of the governor balls for stability?
a) Must increase
b) Must decrease
c) Must remain constant
d) Equilibrium speed independent of radius of rotation
View Answer

Answer: a
Explanation: In order to achieve stability in a porter governor, the equilibrium speed must increase with the increase of radius of rotation of the governor balls.
Sanfoundry Certification Contest of the Month is Live. 100+ Subjects. Participate Now!

6. For a more sensitive governor, the change in angle between OA and the x axis with change in radius of rotation should be? (the x – axis represents radius of rotation and the y axis represents the controlling force.)

a) Small
b) Large
c) Remain same
d) Is independent of this angle
View Answer

Answer: a
Explanation: For the governor to be more sensitive, the change in the value of angle between OA and the x-axis over the change of radius of rotation should be as small as possible.

7. In the given figure, the straight line OA represents _________ (the x – axis represents radius of rotation and the y axis represents the controlling force.)

a) Isochronous governor
b) Hartnell governor
c) Non – Isochronous governor
d) Stable governor
View Answer

Answer: a
Explanation: For the isochronous governor, the controlling force curve is a straight line passing through the origin, thus in the above figure, AO is passing through the origin.
advertisement

8. In the given figure if the angle between OA and x-axis is made 90 degrees, the rotation speed will become 0. (the x – axis represents radius of rotation and the y axis represents the controlling force.)

a) True
b) False
View Answer

Answer: b
Explanation: In the given figure if the angle between OA and x-axis is made 90 degrees, the rotation speed will become infinite, as the speed is directly proportional to the root of tangent of that angle.

Sanfoundry Global Education & Learning Series – Machine Dynamics.

advertisement

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

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

advertisement
advertisement
Subscribe to our Newsletters (Subject-wise). Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs!

Youtube | Telegram | LinkedIn | Instagram | Facebook | Twitter | Pinterest
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

Subscribe to his free Masterclasses at Youtube & discussions at Telegram SanfoundryClasses.