Theory of Machines Objective Questions with Answers pdf - Set 21 - ObjectiveBooks

# Practice Test: Question Set - 21

1. A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of
(A) 2 mm
(B) 2.22 mm
(C) 2.50 mm
(D) 3.0 mm

2. When the speed of the engine fluctuates continuously above and below the mean speed, the governor is said to be
(A) Stable
(B) Unstable
(C) Isochronous
(D) Hunt

3. Klein's construction can be used to determine acceleration of various parts when the crank is at
(C) Right angles to the link of the stroke
(D) All of the above

4. Sense of tangential acceleration of a link
(A) Is same as that of velocity
(B) Is opposite to that of velocity
(C) Could be either same or opposite to velocity
(D) Is perpendicular to that of velocity

5. 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

6. In a Hartnell governor, the compression of the spring is __________ the lift of the sleeve.
(A) Equal to
(B) Less than
(C) Greater than
(D) None of these

7. The method of obtaining different mechanisms by fixing in turn different links in a kinematic chain, is known as
(A) Structure
(B) Machine
(C) Inversion
(D) Compound mechanism

8. The Coriolis component of acceleration exists whenever a point moves along a path that has
(A) Linear displacement
(B) Rotational motion
(C) Gravitational acceleration
(D) Tangential acceleration

9. In a reciprocating steam engine, which of the following forms a kinematic link?
(A) Cylinder and piston
(B) Piston rod and connecting rod
(C) Crankshaft and flywheel
(D) Flywheel and engine frame

10. Coriolis component acts
(A) Perpendicular to sliding surfaces
(B) Along sliding surfaces
(C) Somewhere in between above two
(D) None of the above

11. 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

12. The centre of percussion is below the centre of gravity of the body and is at a distance equal to
(A) h/kG
(B) /kG
(C) kG²/h
(D) h × kG

13. Maximum fluctuation of energy in a flywheel is equal to [where I = Mass moment of inertia of the flywheel, E = Maximum fluctuation of energy, CS = Coefficient of fluctuation of speed, and Ï‰ = Mean angular speed = (Ï‰₁ + Ï‰₂)/2]
(A) I.Ï‰.(Ï‰₁ - Ï‰₂)
(B) I.Ï‰².CS
(C) 2.E.CS
(D) All of these

14. The arrangement is called bevel gearing, when two __________ are connected by gears.
(A) Intersecting and coplanar shafts
(B) Non-intersecting and non-coplanar shafts
(C) Parallel and coplanar shafts
(D) Parallel and non-coplanar shafts

15. The stress induced in a body will be shear stress, when it is subjected to
(A) Longitudinal vibrations
(B) Transverse vibrations
(C) Torsional vibrations
(D) None of these

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