# Practice Test: Question Set - 12

1. The axis of precession is __________ to the plane in which the axis of spin is going to rotate.
(A) Parallel
(B) Perpendicular
(C) Both A and B
(D) None of these

2. The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as
(A) Damping factor
(B) Damping coefficient
(C) Logarithmic decrement
(D) Magnification factor

3. If the radius of gyration of a compound pendulum about an axis through e.g. is more, then its frequency of oscillation will be
(A) Less
(B) More
(C) Same
(D) Data are insufficient to determine same

4. Klein's construction is useful to determine
(A) Velocity of various parts
(B) Acceleration of various parts
(C) Displacement of various parts
(D) Angular acceleration of various parts

5. 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 P with respect to the crank-pin C is given by

(A) Ï‰² × NO
(B) Ï‰² × CO
(C) Ï‰² × CN
(D) Ï‰² × QN

6. When the crank is at the inner dead center, in a reciprocating steam engine, then the acceleration of the piston will be
(A) Ï‰²r. (n + 1)/n
(B) Ï‰²r. (n - 1)/n
(C) Ï‰²r. n/(n + 1)
(D) Ï‰²r. n/(n - 1)

7. Under logarithmic decrement, the amplitude of successive vibrations are
(A) Constant
(B) In arithmetic progression
(C) In geometric progression
(D) In logarithmic progression

8. A spring controlled governor is said to be stable if the controlling force line when produced intersects the Y-axis
(A) At the origin
(B) Below the origin
(C) Above the origin
(D) Any one of these

9. Which of the following disciplines provides study of relative motion between the parts of a machine?
(A) Theory of machines
(B) Applied mechanics
(C) Mechanisms
(D) Kinematics

10. Cross head and guides form a
(A) Lower pair
(B) Higher pair
(C) Turning pair
(D) Sliding pair

11. In a coupling rod of a locomotive, each of the four pairs is a ________ pair.
(A) Sliding
(B) Turning
(C) Rolling
(D) Screw

12. The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity Ï‰₁ rad/s in the clockwise direction and the link OB turns with angular velocity Ï‰₂ rad/s in the clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)
(A) Ï‰₁.Ï‰₂.r
(B) (Ï‰₁ - Ï‰₂)r
(C) (Ï‰₁ + Ï‰₂)r
(D) (Ï‰₁ - Ï‰₂)2r

13. The dynamic friction is the friction experienced by a body, when the body
(A) Is in motion
(B) Is at rest
(C) Just begins to slide over the surface of the other body
(D) None of the above

14. The frictional torque transmitted in a flat pivot bearing with assumption of uniform pressure is _________ as compared to uniform wear.
(A) Less
(B) More
(C) Same
(D) None of these

15. A foot step bearing and rotor of a vertical turbine form examples of
(A) Incompletely constrained motion
(B) Partially constrained motion
(C) Completely constrained motion
(D) Successfully constrained motion

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