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MCQ Questions and Answers on Theory of Machines

Q.  
A body in motion will be subjected to Coriolis acceleration when that body is


Discuss

Answer :   Option:- D

Explanation :

A body in motion will be subjected to Coriolis acceleration when that body is restrained to rotate while sliding over another body.


Q.  
The instantaneous center of rotation of a rigid thin disc rolling on a plane rigid surface is located at


Discuss

Answer :   Option:- C

Explanation :

Discuss here! No Explaination Available for These Question.


Q.  
In order to draw the acceleration diagram, it is necessary to determine the Coriolis component of acceleration in the case of


Discuss

Answer :   Option:- A

Explanation :

In order to draw the acceleration diagram, it is necessary to determine the Coriolis component of acceleration in the case of crank and slotted lever quick return mechanism.


Q.  
When a slider moves with a velocity v on a link rotating at an angular speed of ω, the Coriolis component of acceleration is given by


Discuss

Answer :   Option:- D

Explanation :

Discuss here! No Explaination Available for These Question.


Q.  
The total number of instantaneous centers for a mechanism consisting of ‘n’ links is


Discuss

Answer :   Option:- D

Explanation :

The total number of instantaneous centers for a mechanism consisting of ‘n’ links is given by,\n n(n−1)/2


Q.  
What is the number of instantaneous centers of rotation for a 6-link mechanism?


Discuss

Answer :   Option:- D

Explanation :

Given :
no. of links n=6
Number of instantaneous centers:
N = n(n - 1)/2
N = 6(6 - 1)/2
N=15 (ans)


Q.  
Instantaneous center of a body rolling with sliding on a stationary curved surface lies


Discuss

Answer :   Option:- D

Explanation :

Discuss here! No Explaination Available for These Question.


Q.  
For a spring-loaded roller-follower driven with a disc cam


Discuss

Answer :   Option:- B

Explanation :

Pressure angle is the angle between normal to the pitch curve at a point and direction of motion of follower. Thus, for easy lift pressure angle should be minimum while for return it can be greater.


Q.  
The choice of displacement diagram during rise or return of a follower of a cam-follower mechanism is based on dynamic considerations. For high speed cam follower mechanism, the most suitable displacement for the follower is


Discuss

Answer :   Option:- A

Explanation :

There are no abrupt changes in velocity and acceleration, hence, cycloidal program is the most suitable one for high speed follower motion.


Q.  
In a plane cam mechanism with reciprocating roller follower, the follower has a constant acceleration in the case of


Discuss

Answer :   Option:- C

Explanation :

In parabolic motion of the follower the acceleration remains constant.