Theory of Machines MCQ Practice Test - Set 33 - ObjectiveBooks

# Practice Test: Question Set - 33

1. In gears, interference takes place when
(A) The tip of a tooth of a mating gear digs into the portion between base and root circles
(B) Gears do not move smoothly in the absence of lubrication
(C) Pitch of the gears is not same
(D) Gear teeth are undercut

2. In under damped vibrating system, the amplitude of vibration
(A) Decreases linearly with time
(B) Increases linearly with time
(C) Decreases exponentially with time
(D) Increases exponentially with time

3. A body is said to be under forced vibrations, when
(A) There is a reduction in amplitude after every cycle of vibration
(B) No external force acts on a body, after giving it an initial displacement
(C) A body vibrates under the influence of external force
(D) None of the above

4. Creep in belt drive is due to
(A) Weak material of the belt
(B) Weak material of the pulley
(C) Uneven extensions and contractions of the belt when it passes from tight side to slack side
(D) Expansion of the belt

5. Which of the following statements regarding laws governing the friction between dry surfaces are correct?
(A) The friction force is dependent on the materials of the contact surfaces.
(B) The friction force is directly proportional to the normal force.
(C) The friction force is independent of me area of contact.
(D) All of the above

6. The product of the diametral pitch and circular pitch is equal to
(A) 1
(B) 1/Ï€
(C) Ï€
(D) 2 Ï€

7. The partial balancing means
(A) Balancing partially revolving masses
(B) Balancing partially reciprocating masses
(C) Best balancing of engines
(D) All of these

8. In a four stroke I.C. engine, the turning moment during the compression stroke is
(A) Positive throughout
(B) Negative throughout
(C) Positive during major portion of the stroke
(D) Negative during major portion of the stroke

9. The displacement of a flat faced follower when it has contact with the flank of a circular arc cam, is given by (where R = Radius of flank, r₁ = Minimum radius of the cam, and Î¸ = Angle turned through by the cam)
(A) R (1 - cosÎ¸)
(B) (R - r₁) (1 - cosÎ¸)
(C) R (1 - sinÎ¸)
(D) (R - r₁) (1 - sinÎ¸)

10. A pulley and belt in a belt drive form a
(A) Cylindrical pair
(B) Turning pair
(C) Rolling pair
(D) Sliding pair

11. ________ is an inversion of Double slider crank chain.
(A) Coupling rod of a locomotive
(B) Scotch yoke mechanism
(C) Hand pump
(D) Reciprocating engine

12. The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be
(A) 12
(B) 14
(C) 18
(D) 24

13. The height of a Watt's governor (in meters) is equal to (where N = Speed of the arm and ball about the spindle axis)
(A) 8.95/
(B) 89.5/
(C) 895/
(D) 8950/

14. A mass of 1 kg is attached to the end of a spring with a stiffness of 0.7 N/mm. The critical damping coefficient of this system is
(A) 1.4 N-s/m
(B) 18.52 N-s/m
(C) 52.92 N-s/m
(D) 529.2 N-s/m

15. In vibration isolation system, the transmissibility will be equal to unity, for all values of damping factor, if Ï‰/Ï‰n is
(A) Equal to 1
(B) Equal to 2
(C) Less than 2
(D) Greater than 2

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