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.Management Sciences
Category: Theory of Machines
In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The distance between fixed pivots of crank and followers is________________________?
A. 95 mm
B. slightly less than 95 mm
C. slightly more than 95 mm
D. 45 mm
E. none of the above
For simple harmonic motion of the of follower, a cosine curve represents___________________?
A. displacement diagram
B. velocity diagram
C. acceleration diagram
D. all of the above
E. none of the above
Davis steering gear consists of__________________?
A. sliding pairs
B. turning pairs
C. rolling pairs
D. higher pairs
E. lower pairs
Ackermann steering gear consists of_______________?
A. sliding pairs
B. turning pairs
C. rolling pairs
D. higher pairs
E. lower pairs
The example of spherical pair is_____________________?
A. bolt and nut
B. lead screw of a lathe
C. ball and socket joint
D. ball bearing and roller bearing
E. none of the above
If some links are connected such that motion between them can take place in more than one direction, it is called_______________?
A. incompletely constrained motion
B. partially constrained motion
C. completely constrained motion
D. successfully constrained motion
E. none of the above
The type of coupling used to join two shafts whose axes are neither in same straight line nor parallel, but intersect is______________________?
A. flexible coupling
B. universal coupling
C. chain coupling
D. Oldham’s coupling
E. American coupling
In a rigid link OA, velocity of A w.r.t. will be___________________?
A. parallel to OA
B. perpendicular to OA
C. at 45° to OA
D. along AO
E. along OA
The absolute acceleration of any point P in a link about center of rotation 0 is___________________?
A. along PO
B. perpendicular to PO
C. at 45° to PO
D. along OP
E. none of the above
In a shaper mechanism, the Corioli’s component of acceleration will_______________?
A. not exist
B. exist
C. depend on position of crank
D. unpredictable
E. none of the above
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