Theory of Machines Mechanical Engineering Objective Questions with Answers - Set 11

Practice Test: Question Set - 11

1. The frictional torque transmitted in a flat collar bearing, considering uniform pressure, is (where r₁ and r₂ = External and internal radii of collar respectively)
    (A) (1/2). μ W (r₁ + r₂)
    (B) (2/3). μ W (r₁ + r₂)
    (C) (1/2). μ W  [(r₁³ - r₂³)/(r₁² - r₂²)]
    (D) (2/3). μ W [(r₁³ - r₂³)/(r₁² - r₂²)]

2. In a flat collar pivot bearing, the moment due to friction is proportional to
    (A) (r₁² - r₂²)/(r₁ - r₂)
    (B) (r₁² - r₂²)/(r₁ + r₂)
    (C) (r₁³ - r₂³)/(r₁² - r₂²)
    (D) (r₁³ - r₂³)/(r₁ - r₂)

3. The cam and follower is an example of
    (A) Sliding pair
    (B) Rolling pair
    (C) Lower pair
    (D) Higher pair

4. When a shaking force is transmitted through the springs, damping becomes detrimental when the ratio of its frequency to the natural frequency is greater than
    (A) 0.25
    (B) 0.5
    (C) 1
    (D) 2

5. Angle of dwell of cam is defined as the angle
    (A) During which the follower returns to its initial position
    (B) Of rotation of the cam for definite displacement of the follower
    (C) Through which the cam rotates during the period in which the follower remains in the highest position
    (D) Moved by the cam from the instant the follower begins to rise, till it reaches its highest position

6. Rectilinear motion of piston is converted into rotary by
    (A) Cross head
    (B) Slider crank
    (C) Connecting rod
    (D) Gudgeon pin

7. In an ideal machine, the output as compared to input is
    (A) Less
    (B) More
    (C) Equal
    (D) May be less or more depending on efficiency

8. In a mechanism, the fixed instantaneous centers are those centers which
    (A) Remain in the same place for all configurations of the mechanism
    (B) Vary with the configuration of the mechanism
    (C) Moves as the mechanism moves, but joints are of permanent nature
    (D) None of the above

9. At the nodal point in a shaft, the amplitude for torsional vibration will be
    (A) Minimum
    (B) Maximum
    (C) Zero
    (D) Infinity

10. In a Hartnell governor, if a spring of greater stiffness is used, then the governor will be
    (A) Less sensitive
    (B) More sensitive
    (C) Unaffected of sensitivity
    (D) Isochronous

11. The two elements of a pair are said to form a higher pair, when they
    (A) Have a surface contact when in motion
    (B) Have a line or point contact when in motion
    (C) Are kept in contact by the action of external forces, when in motion
    (D) Permit relative motion

12. Torsional 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

13. A point on a link connecting double slider crank chain traces a
    (A) Ellipse
    (B) Circle
    (C) Parabola
    (D) Hyperbola

14. In a mechanism, usually one link is fixed. If the fixed link is changed in a kinematic chain, then relative motion of other links
    (A) Will remain same
    (B) Will change
    (C) Could change or remain unaltered depending on which link is fixed
    (D) Will not occur

15. Two heavy rotating masses are connected by shafts of lengths l₁, l₂ and l₃ and the corresponding diameters are d₁, d₂ and d₃. This system is reduced to a torsionally equivalent system having uniform diameter d = d₁ of the shaft. The equivalent length of the shaft is
    (A) (l₁ + l₂ + l₃)/3
    (B) l = l₁ + l₂.(d₁/d₂)³ + l₂.(d₁/d₃)³
    (C) l = l₁ + l₂.(d₁/d₂)⁴ + l₃.(d₁/d₃)⁴
    (D) l₁ + l₂ + l₃

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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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Item Reviewed: Theory of Machines Mechanical Engineering Objective Questions with Answers - Set 11 Rating: 5 Reviewed By: Pranab Debnath
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