Theory of Machines Practice Test - Set 18 - ObjectiveBooks

# Practice Test: Question Set - 18

1. The Coriolis component of acceleration acts
(A) Along the sliding surface
(B) Perpendicular to the sliding surface
(C) At 45° to the sliding surface
(D) Parallel to the sliding surface

2. When a slider moves on a fixed link having curved surface, their instantaneous centre lies
(A) On their point of contact
(B) At the centre of curvature
(C) At the centre of circle
(D) At the pin joint

3. A kinematic chain requires at least
(A) 2 links and 3 turning pairs
(B) 3 links and 4 turning pairs
(C) 4 links and 4 turning pairs
(D) 5 links and 4 turning pairs

4. The maximum value of the pressure angle in case of cam is kept as
(A) 10°
(B) 14°
(C) 20°
(D) 30°

5. In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done
(A) Because of difficulty in manufacturing cam profile
(B) Because of loose contact of follower with cam surface
(C) In order to have acceleration in beginning and retardation at the end of stroke within the finite limits
(D) Because the uniform velocity motion is a partial parabolic motion

6. In a disc clutch, if there are n₁ number of discs on the driving shaft and n₂ number of discs on the driven shaft, then the number of pairs of contact surfaces will be
(A) n₁ + n₂
(B) n₁ + n₂ + 1
(C) n₁ + n₂ - 1
(D) n₁ + n₂ - 2

7. The unbalanced force due to reciprocating masses
(A) Varies in magnitude but constant in direction
(B) Varies in direction but constant in magnitude
(C) Varies in magnitude and direction both
(D) Constant in magnitude and direction both

8. The motion between a pair when limited to a definite direction, irrespective of the direction of force applied, is known as
(A) Completely constrained motion
(B) Incompletely constrained motion
(C) Successfully constrained motion
(D) None of these

9. The mechanism forms a structure, when the number of degrees of freedom (n) is equal to
(A) 0
(B) 1
(C) 2
(D) -1

10. Kinematic pairs are those which have two elements that
(A) Have line contact
(B) Have surface contact
(C) Permit relative motion
(D) Are held together

11. A cam mechanism imparts following motion
(A) Rotating
(B) Oscillating
(C) Reciprocating
(D) All of the above

12. Coriolis component is encountered in
(A) Quick return mechanism of shaper
(B) Four bar chain mechanism
(C) Slider crank mechanism
(D) Both (A) and (C) above

13. Which of the following is a lower pair?
(A) Ball and socket i
(B) Piston and cylinder
(C) Cam and follower
(D) Both (A) and (B) above

14. Davis steering gear consists of
(A) Sliding pairs
(B) Turning pairs
(C) Rolling pairs
(D) Higher pairs

15. Two pulleys of radii r₁ and r₂ and at distance x apart are connected by means of an open belt drive. The length of the belt is
(A) Ï€ (r₁ + r₂) + (r₁ + r₂)²/x + 2x
(B) Ï€ (r₁ + r₂) + (r₁ - r₂)²/x + 2x
(C) Ï€ (r₁ - r₂) + (r₁ - r₂)²/x + 2x
(D) Ï€ (r₁ - r₂) + (r₁ + r₂)²/x + 2x

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