Theory of Machine Practice Test - Set 02 - ObjectiveBooks

# Practice Test: Question Set - 02

1. The primary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the length of connecting rod to radius of crank)
(A) m.ω².r sinθ
(B) m.ω².r cosθ
(C) m.ω².r (sin 2θ/n)
(D) m.ω².r (cos 2θ/n)

2. The steering of a ship means
(A) Movement of a complete ship up and down in vertical plane about transverse axis
(B) Turning of a complete ship in a curve towards right or left, while it moves forward
(C) Rolling of a complete ship sideways
(D) None of the above

3. The height of a Watt's governor is
(A) Directly proportional to speed
(B) Directly proportional to (speed)²
(C) Inversely proportional to speed
(D) Inversely proportional to (speed)²

4. In a differential band brake as shown in the below figure, if the length OB is greater than OA, then the force P at C should act in the downward direction.

(A) Yes
(B) No
(C) Unpredictable
(D) None of these

5. A slider crank chain consists of following numbers of turning and sliding pairs
(A) 1, 3
(B) 2, 2
(C) 3, 1
(D) 4, 0

6. Kinematic pairs are those which have
(A) Point or line contact between the two elements when in motion
(B) Surface contact between the two elements when in motion
(C) Elements of pairs not held together mechanically
(D) Two elements that permit relative motion

7. The displacement of the reciprocating roller follower, when it has contact with the straight flanks of the tangent cam, is given by (where r₁ = Minimum radius of the cam, r₂ = Radius of the roller follower, and θ = Angle turned by the cam from the beginning of the follower displacement)
(A) (r₁ - r₂) (1 - cosθ)
(B) (r₁ + r₂) (1 + cosθ)
(C) (r₁ - r₂) [(1 - cosθ)/cosθ]
(D) (r₁ + r₂) [(1 - cosθ)/cosθ]

8. Longitudinal vibrations are said to occur when the particles of a body moves
(A) Perpendicular to its axis
(B) Parallel to its axis
(C) In a circle about its axis
(D) None of these

9. When brakes are applied to all the four wheels of a moving car, the distance traveled by the car before it is brought to rest, will be
(A) Maximum
(B) Minimum
(C) Zero
(D) None of these

10. In a drag link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is
(A) Equal to sum of other two
(B) Greater than sum of other two
(C) Less than sum of other two
(D) There is no such relationship

11. The frictional torque transmitted in a conical pivot bearing, considering uniform wear, is
(A) (1/2) μ W R cosecα
(B) (2/3) μ W R cosecα
(C) (3/4) μ W R cosecα
(D) μ W R cosecα

12. In vibration isolation system, if ω/ωn > 1, then the phase difference between the transmitted force and the disturbing force is
(A) 0°
(B) 90°
(C) 180°
(D) 270°

13. The ratio of height of Porter governor (when length of arms and links are equal) to the height of Watt's governor is (where m = Mass of the ball, and M = Mass on the sleeve)
(A) m/(m + M)
(B) M/(m + M)
(C) (m + M)/m
(D) (m + M)/M

14. In a shaper mechanism, the Coriolis component of acceleration will
(A) Not exist
(B) Exist
(C) Depend on position of crank
(D) None of the above

15. In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. This method will
(A) Cause withdrawing or throttling of steam
(B) Reduce length of effective stroke of piston
(C) Reduce maximum opening of port to steam
(D) All of these

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