Theory of Machine Objective Test - Set 07 - ObjectiveBooks

# Practice Test: Question Set - 07

1. The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the anticlockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)
(A) ω₁.ω₂.r
(B) (ω₁ - ω₂) r
(C) (ω₁ + ω₂) r
(D) (ω₁ - ω₂) 2r

2. If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then energy stored in the latter at the same speed will be
(A) Four times the first one
(B) Same as the first one
(C) One fourth of the first one
(D) One and a half times the first one

3. ABCD is a four bar mechanism in which AB = 310 mm and CD = 450 mm. AB and CD are both perpendicular to the fixed link AD, as shown in the below figure. If the velocity of B at this condition is v. Then the velocity of C is

(A) v
(B) (2/3). v
(C) (3/2). v
(D) (9/4). v

4. A spring controlled governor is said to be unstable when the controlling force
(A) Increases as the radius of rotation decreases
(B) Increases as the radius of rotation increases
(C) Decreases as the radius of rotation increases
(D) Remains constant for all radii of rotation

5. Which of the following governor is used to drive a gramophone?
(A) Watt governor
(B) Porter governor
(C) Pickering governor
(D) Hartnell governor

6. In higher pair, the relative motion is
(A) Purely turning
(B) Purely sliding
(C) Purely rotary
(D) Combination of sliding and turning

7. In automobiles the power is transmitted from gear box to differential through
(A) Bevel gear
(B) Universal joint
(C) Hooke's joint
(D) Knuckle joint

8. The equivalent length of a simple pendulum which gives the same frequency as a compound pendulum is
(A) h/(kG² + h²)
(B) (kG² + h²)/h
(C) h²/(kG² + h²)
(D) (kG² + h²)/h²

9. A flywheel is fitted to the crankshaft of an engine having W as the amount of indicated work per revolution and permissible limits of coefficient of fluctuation of energy and speed as CE and CS respectively. The kinetic energy of the flywheel is given by
(A) 2 W CE / CS
(B) W CE / 2CS
(C) W CE / CS
(D) W CS / 2CE

10. TJIE horse power transmitted by a belt is dependent upon
(A) Tension on tight side of belt
(B) Tension on slack side of belt
(D) All of the above

11. Kinematic pairs are those which have
(A) Two elements held together mechanically
(B) Two elements having relative motion
(C) Two elements having Coriolis component
(D) Minimum of two instantaneous centers

12. The pressure angle of a cam depends upon
(A) Offset between center lines of cam and follower
(B) Lift of follower
(C) Angle of ascent
(D) All of the above

13. When two pulleys are connected by means of a cross belt drive, then both the pulleys will rotate in _________ directions.
(A) Same
(B) Opposite
(C) Perpendicular
(D) None of these

14. The swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke (θ) is equal to
(A) 90° and 180°
(B) 45° and 225°
(C) 180° and 270°
(D) 270° and 360°

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

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