Theory of Machine Practice Exam - Set 08

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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Theory of Machines:
  Set 01      Set 02      Set 03      Set 04      Set 05      Set 06      Set 07      Set 08      Set 09
  Set 10      Set 11      Set 12      Set 13      Set 14      Set 15      Set 16      Set 17      Set 18
  Set 19      Set 20      Set 21      Set 22      Set 23      Set 24      Set 25      Set 26      Set 27
  Set 28      Set 29      Set 30      Set 31      Set 32      Set 33      Set 34      Set 35      Set 36
  Set 37      Set 38
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