Theory of Machine Practice Exam - Set 08 - ObjectiveBooks
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# Practice Test: Question Set - 08

1. The velocity of piston in a reciprocating steam engine is given by (where ω = Angular velocity of crank, r = Radius of crank pin circle, θ = Angle turned by crank from inner dead center, and n = Ratio of length of connecting rod to the radius of crank)
(A) ωr [sin θ + (sin 2θ/n)]
(B) ωr [cos θ + (cos 2θ/n)]
(C) ω²r [sin θ + (sin 2θ/n)]
(D) ω²r [cos θ + (cos 2θ/n)]

2. Which of the following statement is wrong?
(A) A round bar in a round hole form a turning pair
(B) A square bar in a square hole form a sliding pair
(C) A vertical shaft in a foot step bearing forms a successful constraint
(D) All of the above

3. In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction)
(A) P = W tan(α - φ)
(B) P = W tan(α + φ)
(C) P = W tan(φ - α)
(D) P = W cos(α + φ)

4. When two links are connected by a pin joint, their instantaneous center lies
(A) On their point of contact
(B) At the center of curvature
(C) At the center of circle
(D) At the pin joint

5. A kinematic chain is known as a mechanism when
(A) None of the links is fixed
(B) One of the links is fixed
(C) Two of the links are fixed
(D) None of these

6. A circular bar moving in a round hole is an example of
(A) Incompletely constrained motion
(B) Partially constrained motion
(C) Completely constrained motion
(D) Successfully constrained motion

7. The number of links in pantograph mechanism is equal to
(A) 2
(B) 3
(C) 4
(D) 5

8. A mechanism _________ for transmitting or transforming motion.
(A) Can be used
(B) Can not be used
(C) Unpredictable
(D) None of these

9. Which of the following disciplines provides study of inertia forces arising from the combined effect of the mass and the motion of the parts?
(A) Theory of machines
(B) Applied mechanics
(C) Mechanisms
(D) Kinetics

10. Shaft revolving in a bearing is the following type of pair
(A) Lower pair
(B) Higher pair
(C) Spherical pair
(D) Cylindrical pair

11. In a differential band brake as shown in the below figure, the drum rotates anticlockwise and the greater tension T₁ acts at A and smaller tension T₂ at B. Length OA is greater than length OB. In order to apply the brake, the force P at C should

(A) Be zero
(B) Act in upward direction
(C) Act in downward direction
(D) None of the above

12. Throw of a cam is the maximum distance of the follower from
(A) Base circle
(B) Pitch circle
(C) Root circle
(D) Prime circle

13. The ratio of maximum fluctuation of speed to the mean speed is called
(A) Fluctuation of speed
(B) Maximum fluctuation of speed
(C) Coefficient of fluctuation of speed
(D) None of these

14. The sense of Coriolis component 2 ωv is same as that of the relative velocity vector v rotated at
(A) 45° in the direction of rotation of the link containing the path
(B) 45° in the direction opposite to the rotation of the link containing the path
(C) 90° in the direction of rotation of the link containing the path
(D) 180° in the direction opposite to the rotation of the link containing the path

15. The coefficient of fluctuation of speed is __________ of maximum fluctuation of speed and the mean speed.
(A) Sum
(B) Difference
(C) Product
(D) Ratio

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