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

# Quiz Questions

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

02. 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.

03. A pair of friction discs is an example of rolling pair.

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

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

06. 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.

07. 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.

08. 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.

09. The controlling force diagram for a spring controlled governor is a curve passing through the origin.

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.

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

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.

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

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

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

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

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

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.

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.

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

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