Theory of Machine Objective Type Questions - Set 06 - ObjectiveBooks

Practice Test: Question Set - 06

1. The ratio of maximum fluctuation of energy to the work-done per cycle is called
(A) Fluctuation of energy
(B) Maximum fluctuation of energy
(C) Coefficient of fluctuation of energy
(D) None of these

2. A rigid body, under the action of external forces, can be replaced by two masses placed at a fixed distance apart. The two masses form an equivalent dynamical system, if
(A) The sum of the two masses is equal to the total mass of body
(B) The center of gravity of the two masses coincides with that of the body
(C) The sum of mass moment of inertia of the masses about their center of gravity is equal to the mass moment of inertia of the body
(D) All of the above

3. The Whitworth quick return motion mechanism is formed in a slider crank chain when the
(C) Slider is a fixed link

4. Angle of ascent of cam is defined as the angle
(A) During which the follower returns to its initial position
(B) Of rotation of the cam for a definite displacement of the follower
(C) Through which the cam rotates during the period in which the follower remains in highest position
(D) Moved by the cam from the instant the follower begins to rise, till it reaches its highest position

5. A completely constrained motion can be transmitted with.
(A) 1 link with pin joints
(B) 2 links with pin joints
(C) 3 links with pin joints
(D) 4 links with pin joints

6. When a body moves with simple harmonic motion, the product of its periodic time and frequency is equal to
(A) Zero
(B) One
(C) Ï€/2
(D) Ï€

7. The centrifugal tension in belts
(A) Increases power transmitted
(B) Decreases power transmitted
(C) Have no effect on power transmitted
(D) Increases power transmitted upto a certain speed and then decreases

8. In a spring controlled governor, when the controlling force ________ as the radius of rotation increases, it is said to be a stable governor.
(A) Remains constant
(B) Decreases
(C) Increases
(D) None of these

9. The mechanism in which two are turning pairs and two are sliding pairs, is called a
(A) Double slider crank chain
(B) Elliptical trammel
(C) Scotch yoke mechanism
(D) All of these

10. A rotor supported at A and B carries two masses as shown in the below figure. The rotor is

(A) Dynamically balanced
(B) Statically balanced
(C) Statically and dynamically balanced
(D) Not balanced

11. The minimum periodic time of a compound pendulum is
(A) (1/2Ï€). (kG/g)
(B) (1/2Ï€). (2kG/g)
(C) 2Ï€. (kG/g)
(D) 2Ï€. (2kG/g)

12. Idler pulley is used
(A) For changing the direction of motion of the belt
(B) For applying tension
(C) For increasing velocity ratio
(D) All of the above

13. For simple harmonic motion of the of follower, a cosine curve represents
(A) Displacement diagram
(B) Velocity diagram
(C) Acceleration diagram
(D) All of the above

14. For the same lift and same angle of ascent, a smaller base circle will give
(A) A small value of pressure angle
(B) A large value of pressure angle
(C) There is no such relation with pressure angle
(D) Something else

15. The acceleration of the particle moving with simple harmonic motion is _________ at the mean position.
(A) Zero
(B) Minimum
(C) Maximum
(D) None of these

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