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Mechanical Engineering :: Theory of Machine

  1. In a Hartnell governor, the stiffness of the spring is given by (where S1 and S2 = Spring forces exerted on the sleeve at max. and min. radii of rotation, and h = Compression of the spring)

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  3. The relation between the controlling force (Fc) and radius of rotation (r) for a stable spring controlled governor is

  4. A.
    Fc = ar + b
    B.
    Fc = ar - b
    C.
    Fc = ar
    D.
    Fc = a/r + b

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  5. ABCD is a four bar mechanism in which AB = 310 mm and CD = 450 mm. AB and CD are both perpendicular to the fixed link AD, as shown in the below figure. If the velocity of B at this condition is v. Then the velocity of C is

  6. A.
    v
    B.
    v
    C.
    v
    D.
    v

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  7. A rotary internal combustion engine has __________ cylinders.

  8. A.
    four
    B.
    five
    C.
    six
    D.
    seven

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  9. The power transmitted by a belt is maximum when the maximum tension in the belt is __________ of centrifugal tension.

  10. A.
    one-third
    B.
    two-third
    C.
    double
    D.
    three times

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  11. The equivalent length of a simple pendulum which gives the same frequency as a compound pendulum is

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  13. The component of the acceleration, perpendicular to the velocity of the particle, at the given instant is called

  14. A.
    radial component
    B.
    tangential component
    C.
    coriolis component
    D.
    none of these

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  15. The interference may only be avoided if the addendum circles of the two mating gears cut the common tangent to the base circles between the points of tangency.

  16. A.
    True
    B.
    False

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  17. The maximum efficiency of spiral gears is (where θ = Shaft angle, and φ = Friction angle)

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  19. When the crank is at the inner dead centre, in a reciprocating steam engine, then the acceleration of the piston will be

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