# Theory of Machines - Mechanical Engineering online quiz - Set 01

## Theory of Machines Online quiz - Set 01

1. When the connection between the two elements is such that only required kind of relative motion occurs, it is known as self-closed pair.
Right
Wrong

2. When the axes of the shafts, over which the gears are mounted, move relative to a fixed axis, then the train is known as reverted gear train.
Right
Wrong

3. A pair of friction discs is an example of rolling pair.
True
False

4. When a particle moves round the circumference of a circle of radius 'r' with Ï‰ rad/s, then its maximum acceleration is Ï‰²r.
Right
Wrong

5. For static balancing of a shaft, the net dynamic force acting on the shaft is equal to zero.
Agree
Disagree

6. A spring controlled governor is said to be unstable, if the relation between the controlling force (Fc) and radius of rotation (r) is Fc = ar.
Agree
Disagree

7. When the nature of contact between the elements of a pair is such that it can turn or revolve about a fixed axis, the pair is known as a rolling pair.
Correct
Incorrect

8. The natural frequency of free transverse vibrations of a shaft fixed at both ends and carrying a uniformly distributed load is 0.571/Î´S  , where Î´S is the static deflection of a shaft fixed at both ends and carrying a uniformly distributed load.
True
False

9. The controlling force diagram for a spring controlled governor is a curve passing through the origin.
Yes
No

10. The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the right. The effect of gyroscopic couple on the aeroplane will be to dip the nose and raise the tail.
Correct
Incorrect

11. In a multiple V-belt drive, all the belts should stretch at the same rate.
Agree
Disagree

12. The effect of swaying couple in a locomotive is resisted by the side pressure between the flanges of the tyres of the wheel and the inside of the rails.
Agree
Disagree

13. The maximum gyroscopic couple acting on the ship tends to shear the holding down bolts.
Correct
Incorrect

14. In a steam engine, the distance by which the inner edge of the D-slide valve overlaps the steam port is called lead.
Agree
Disagree

15. The inertia force is equal to the accelerating force in magnitude, but opposite in direction.
Right
Wrong

16. A slider moving on a fixed link having constant radius of curvature will have its instantaneous centre at the centre of the circle.
Agree
Disagree

17. The ball and socket joint is an example of screw pair.
Agree
Disagree

18. The interference may only be avoided if the addendum circles of the two mating gears cut the common tangent to the base circles between the points of tangency.
True
False

19. The equation of motion for a vibrating system with viscous damping is (d²x/dt²) + (c/m)(dx/dt) + (s/m).x = 0, if the roots of the equation are complex conjugate, then the system will be critically damped.
Yes
No

20. An over-damped system, when disturbed from the equilibrium position, will not cross the equilibrium position.
Right
Wrong

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