Mechanical Theory of Machines Online Practice Test - Set 10 - ObjectiveBooks

# Practice Test: Question Set - 10

1. The cam follower generally used in aircraft engines is
(A) Knife edge follower
(B) Flat faced follower
(C) Spherical faced follower
(D) Roller follower

2. The lower pair is a
(A) Open pair
(B) Closed pair
(C) Sliding pair
(D) Point contact pair

3. Which of the following is an inversion of a double slider crank chain?
(A) Oldham's coupling
(B) Elliptical trammel
(C) Scotch yoke mechanism
(D) All of these

4. The direction of linear velocity of any point on a link with respect to another point on the same link is
(A) Parallel to the link joining the points
(B) Perpendicular to the link joining the points
(C) At 45° to the link joining the points
(D) None of the above

5. The example of higher pair is
(A) Belt, rope and chain drives
(B) Gears, cams
(C) Ball and roller bearings
(D) All of the above

6. The Hooke's joint consists of:
(A) Two forks
(B) One fork
(C) Three forks
(D) Four forks

7. For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimed stroke respectively, is
(A) Maximum and zero
(B) Zero and maximum
(C) Minimum and maximum
(D) Zero and minimum

8. A disc is a spinning with an angular velocity Ï‰ rad/s about the axis of spin. The couple applied to the disc causing precession will be (where I = Mass moment of inertia of the disc, and Ï‰P = Angular velocity of precession of the axis of spin)
(A) (1/2).IÏ‰²
(B) IÏ‰²
(C) (1/2). I Ï‰ Ï‰P
(D) I Ï‰ Ï‰P

9. A system of masses rotating in different parallel planes is in dynamic balance if the
(A) Resultant force is equal to zero
(B) Resultant couple is equal to zero
(C) Resultant force and resultant couple are both equal to zero
(D) Resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero

10. A machine mounted on a single coil spring has a period of free vibration of tp . If the spring is cut into four equal parts and placed in parallel and the machine is mounted on them, then the period of free vibration of the new system will become
(A) tp /16
(B) tp /4
(C) 4 tp
(D) 16 tp

11. The critical speed of a shaft depends upon its
(A) Mass
(B) Stiffness
(C) Mass and stiffness
(D) Stiffness and eccentricity

12. The main disadvantage of the sliding pair is that it is
(A) Bulky
(B) Wears rapidly
(C) Difficult to manufacture
(D) Both (A) and (B) above

13. In the below figure, PC is the connecting rod and OC is the crank making an angle Î¸ with the line of stroke PO and rotates with uniform angular velocity at Ï‰ rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO, the acceleration of the piston is _________ when the crank OC and connecting rod PC are at right angles to each other.

(A) Infinity
(B) Zero
(C) Any +ve value
(D) Any -ve value

14. Inertia force acts
(A) Perpendicular to the acceleration force
(B) Along the direction of acceleration force
(C) Opposite to the direction of acceleration force
(D) None of the above

15. A circle passing through the pitch point with its center at the center of cam axis is known as
(A) Pitch circle
(B) Base circle
(C) Prime circle
(D) Outer circle

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