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Mechanical Engineering :: Theory of Machine

  1. When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a

  2. A.
    lower pair
    B.
    higher pair
    C.
    self-closed pair
    D.
    force-closed pair

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  3. The centre distance between two meshing involute gears is equal to

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  5. The two elements of a pair are said to form a __________ when they permit relative motion between them.

  6. A.
    open pair
    B.
    kinematic pair

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  7. When the axes of the shafts, over which the gears are mounted, move relative to a fixed axis, then the train is known as reverted gear train.

  8. A.
    Right
    B.
    Wrong

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  9. In under damped vibrating system, the amplitude of vibration

  10. A.
    decreases linearly with time
    B.
    increases linearly with time
    C.
    decreases exponentially with time
    D.
    increases exponentially with time

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  11. The dynamic friction is the friction experienced by a body, when the body

  12. A.
    is in motion
    B.
    is at rest
    C.
    just begins to slide over the surface of the other body
    D.
    none of the above

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  13. The steering of a ship means

  14. A.
    movement of a complete ship up and down in vertical plane about transverse axis
    B.
    turning of a complete ship in a curve towards right or left, while it moves forward
    C.
    rolling of a complete ship side-ways
    D.
    none of the above

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  15. The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, and θ = Angle of inclination of crank to the line of stroke)

  16. A.
    m2.r cos θ
    B.
    c.m2.r sin θ
    C.
    (1 - c)m2.r(cos θ - sin θ)
    D.
    m2.r(cos θ - sin θ)

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  17. The radial distance of a tooth from the pitch circle to the bottom of the tooth is called

  18. A.
    dedendum
    B.
    addendum
    C.
    clearance
    D.
    working depth

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

  20. A.
    minimum
    B.
    zero
    C.
    maximum
    D.
    none of these

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