Theory of Machines On-line Test - Set 25 - ObjectiveBooks
Theory of Machines On-line Test - Set 25

Theory of Machines On-line Test - Set 25

Practice Test: Question Set - 25

1. The inversion of a mechanism is
    (A) Changing of a higher pair to a lower pair
    (B) Turning its upside down
    (C) Obtained by fixing different links in a kinematic chain
    (D) Obtained by reversing the input and output motion
2. The static balancing is satisfactory for low speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because, the
    (A) Unbalanced couples are caused only at higher speeds
    (B) Unbalanced forces are not dangerous at higher speeds
    (C) Effects of unbalances are proportional to the square of the speed
    (D) Effects of unbalances are directly proportional to the speed
3. In gramophones for adjusting the speed of the turntable, the following type of governor is commonly employed
    (A) Hartung governor
    (B) Wilson Hartnell governor
    (C) Pickering governor
    (D) Inertia governor
4. For a kinematic chain to be considered as mechanism
    (A) Two links should be fixed
    (B) One link should be fixed
    (C) None of the links should be fixed
    (D) There is no such criterion
5. Which of the following would constitute a link?
    (A) Piston, piston rod and cross head
    (B) Piston and piston rod
    (C) Piston rod and cross head
    (D) Piston, crank pin and crank shaft
6. Which of the following is a spring controlled governor?
    (A) Hartnell governor
    (B) Hartung governor
    (C) Wilson-Hartnell governor
    (D) All of these
7. The frictional torque transmitted in a flat collar bearing, considering uniform wear, 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)]
8. The velocity of sliding __________ the distance of the point of contact from the pitch point.
    (A) Is directly proportional to
    (B) Is inversely proportional to
    (C) Is equal to cosφ multiplied by
    (D) Does not depend upon
9. A spring controlled governor is said to be isochronous when the controlling force
    (A) Increases as the radius of rotation decreases
    (B) Increases as the radius of rotation increases
    (C) Decreases as the radius of rotation increases
    (D) Remain constant for all radii of rotation
10. The factor which affects the critical speed of a shaft is
    (A) Diameter of disc
    (B) Span of shaft
    (C) Eccentricity
    (D) All of these
11. When the sleeve of a Porter governor moves upwards, the governor speed
    (A) Increases
    (B) Decreases
    (C) Remain unaffected
    (D) First increases and then decreases
12. It is required to connect two parallel shafts, the distance between whose axes is small and variable. The shafts are coupled by
    (A) Universal joint
    (B) Knuckle joint
    (C) Oldham's coupling
    (D) Flexible coupling
13. In S.H.M., acceleration is proportional to
    (A) Velocity
    (B) Displacement
    (C) Rate of change of velocity
    (D) All of the above
14. The velocity of a particle moving with simple harmonic motion, at any instant is given by (where ω = Displacement of the particle from mean position)
    (A) ω √(x² - r²)
    (B) ω √(r² - x²)
    (C) ω² √(x² - r²)
    (D) ω² √(r² - x²)
15. The lead screw of a lathe with nut forms a
    (A) Rolling pair
    (B) Sliding pair
    (C) Screw pair
    (D) Turning pair
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