Theory of Machines Model Quiz Practice Questions Test2

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1. An eccentric sheave pivoted at one point rotates and transmits oscillatory motion to a link whose one end is pivoted and other end is connected to it. This mechanism has
2 links	3 links
4 links	5 links

2. Whitworth quick return mechanism is obtained by inversion of _____.
slider crank mechanism	kinematic chain
five link mechanism	roller cam mechanism

3. In its simplest form, a cam mechanism consists of following number of links _____.
1	2
3	4

4. Which of the following mechanisms produces mathematically an exact straight line motion
Grasshopper mechanism	Watt mechanism
Peaucellier's mechanism	Tchabichiff mechanism

5. In a mechanism, usually one link is fixed. If the fixed link is changed in a kinematic chain, then relative motion of other links
will remain same	will change
could change or remain unaltered depending oh which link is fixed	will not occur

6. A kinematic chain requires at least _____.
2 links and 3 turning pairs	3 links and 4 turning pairs
4 links and 4 turning pairs	5 links and 4 turning pairs

7. In a darg link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is _____.
equal to sum of other two	greater than sum of other two
less than sum of other two	there is no such relationship

8. The following is the inversion of slider crank chain mechanism
Whitworth quick return mechanism	hand pump
oscillating cylinder engine	all of the above

9. Kinematic pairs are those which have
two elements held together mechanically	two elements having relative motion
two elements having Coroili's component	minimum of two instantaneous centres

10. A typewriter mechanism has 7 number of binary joints, six links and none of higher pairs. The mechanism is ____.
kinematically sound	not sound
soundness would depend upon which link is kept fixed	data is not sufficient to determine same

11. 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
95 mm	slightly less than 95 mm
slightly more than 95 mm	45 mm

12. In S.H.M., acceleration is proportional to
velocity	displacement
rate of change of velocity	all of the above

13. For simple harmonic motion of the of follower, a cosine curve represents
displacement diagram	velocity diagram
acceleration diagram	all of the above

14. In S.H.M., the velocity vector w.r.t. displacement vector
leads by 90°	lags by 90°
leads by 180°	could be anywhere

15. A body having moment of inertia o:m2 is rotating at 210 RPM and r with another body at rest having I 40 kg m2. The resultant speed after ing will be
90 RPM	100 RPM
80 RPM	data are insufficient

16. Inertia force acts _____.
perpendicular to the accel force	along the direction of accel force
opposite to the direction of ace ing force	in any direction w.r.t. accel* force depending on the magnit two

17. The frequency of oscillation at compared to earth will be_____.
6 times more	6 times less
2.44 times more	2.44 times,less

18. If the radius of gyration of a compound pendulum about an axis through e.g. is more, then its frequency of oscillation will be
less	more
same	data are insufficient to determine same

19. The Bifilar suspension method is used to determine _____.
natural frequency of vibration	position of balancing weights
moment of inertia	centripetal acceleration

20. Which is the false statement about the properties of instantaneous centre
at the instantaneous centre of rotation, one rigid link rotates instantaneously relative to another for the configuration of mechanism considered	the two rigid links have no linear velocities relative to each other at the instantaneous centre
the two rigid links which have no linear velocity relative to each other at this centre have the same linear velocity to the third rigid link	the double centre can be denoted either by 02\ or Ol2, but proper selec¬tion should be made