Home / Mechanical Engineering / Theory of Machine :: Section 3

Mechanical Engineering :: Theory of Machine

  1. When a rigid body is suspended vertically and it oscillates with a small amplitude under the action of the force of gravity, the body is known as

  2. A.
    simple pendulum
    B.
    compound pendulum
    C.
    torsional pendulum
    D.
    second's pendulum

  3. Longitudinal vibrations are said to occur when the particles of a body moves

  4. A.
    perpendicular to its axis
    B.
    parallel to its axis
    C.
    in a circle about its axis
    D.
    none of these

  5. The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ω = Angular velocity of the cam shaft)

  6. A.
    ω(r1 - r2)sin θ
    B.
    ω(r1 + r2)sinθ sec2θ
    C.
    ω(r1 - r2)cos θ
    D.
    ω(r1 + r2)cos θ cosec2 θ

  7. The sensitiveness of the governor __________ as the speed range decreases.

  8. A.
    remains unaffected
    B.
    decreases
    C.
    increases

  9. In Meyer's expansion valve, the expansion valve is driven by an eccentric having an angle of advance from

  10. A.
    50° - 60°
    B.
    60° - 70°
    C.
    70° - 80°
    D.
    80° - 90°

  11. The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)

  12. A.
    μ W R
    B.
    μ W R
    C.
    μ W R
    D.
    μ W R

  13. If the damping factor for a vibrating system is unity, then the system will be

  14. A.
    over damped
    B.
    under damped
    C.
    critically damped
    D.
    without vibrations

  15. In vibration isolation system, if ω/ωn < 2, then for all values of damping factor, the trans-missibility will be (where ω = Angular speed of the system, ωn = Natural frequency of vibration of the system)

  16. A.
    less than unity
    B.
    equal to unity
    C.
    greater than unity
    D.
    zero

  17. When a point at the end of a link moves with constant angular velocity, its acceleration will have

  18. A.
    radial component only
    B.
    tangential component only
    C.
    coriolis component only
    D.
    radial and tangential components both

  19. The time taken by a particle for one complete oscillationis known as periodic time.

  20. A.
    Agree
    B.
    Disagree