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Mechanical Engineering :: Theory of Machine

  1. The displacement of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by (where R = Radius of flank, r1 = Minimum radius of the cam, and θ = Angle turned through by the cam)

  2. A.
    R(1 - cos θ)
    B.
    (R - r1)(1 - cos θ)
    C.
    R(1 - sin θ)
    D.
    (R - r1)(1 - sin θ)

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  3. In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral C Q NO, the acceleration of the piston is zero when the crank OC and connecting rod PC are at right angles to each other.

  4. A.
    Correct
    B.
    Incorrect

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  5. The contact ratio is the ratio of

  6. A.
    length of pair of contact to the circular pitch
    B.
    length of arc of contact to the circular pitch
    C.
    length of arc of approach to the circular pitch
    D.
    length of arc of recess to the circular pitch

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  7. An exact straight line motion mechanism is a

  8. A.
    Scott-Russell's mechanism
    B.
    Hart's mechanism
    C.
    Peaucellier's mechanism
    D.
    all of these

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  9. A body of weight W is required to move up the rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by (where μ = tan φ = Coefficient of friction between the plane and the body)

  10. A.
    P = W tan α
    B.
    P = W tan (α + φ)
    C.
    P = W (sin α + μ cos α)
    D.
    P = W (cos α + μ sin α)

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  11. When the sleeve of a Porter governor moves downwards, the governor speed

  12. A.
    increases
    B.
    decreases
    C.
    remains unaffected
    D.
    first increases and then decreases

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  13. When one of the links of a kinematic chain is fixed, the chain is known as a

  14. A.
    structure
    B.
    mechanism
    C.
    inversion
    D.
    machine

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  15. The natural frequency of free transverse vibrations of a shaft fixed at both ends and carrying a uniformly distributed load is 0.571/δS , where δS is the static deflection of a shaft fixed at both ends and carrying a uniformly distributed load.

  16. A.
    True
    B.
    False

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  17. When brakes are applied to all the four wheels of a moving car, the distance travelled by the car before it is brought to rest, will be

  18. A.
    maximum
    B.
    minimum
    C.
    zero

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  19. In a steam engine, the distance by which the outer edge of the D-slide valve overlaps the steam port is called

  20. A.
    lead
    B.
    steam lap
    C.
    exhaust lap
    D.
    none of these

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