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Mechanical Engineering :: Theory of Machine

  1. Which of the following statement is correct?

  2. A.
    The primary unbalanced force is less than the secondary unbalanced force.
    B.
    The primary unbalanced force is maximum twice in one revolution of the crank.
    C.
    The unbalanced force due to reciprocating masses varies in magnitude and direction both.
    D.
    The magnitude of swaying couple in locomotives is inversely proportional to the distance between the two cylinder centre lines

  3. The magnitude of velocities of the points on a rigid link is

  4. A.
    directly proportional to the distance from the points to the instantaneous centre and is parallel to the line joining the point to the instantaneous centre
    B.
    directly proportional to the distance from the points to the instantaneous centre and is perpendicular to the line joining the point to the instantaneous centre
    C.
    inversely proportional to the distance from the points to the instantaneous centre and is parallel to the line joining the point to the instantaneous centre
    D.
    inversely proportional to the distance from the points to the instantaneous centre and is perpendicular to the line joining the point to the instantaneous centre

  5. A pendulum type governor is a Watt governor.

  6. A.
    Agree
    B.
    Disagree

  7. In a single slider crank chain

  8. A.
    each of the four pairs is a turning pair
    B.
    one is a turning pair and three are sliding pairs
    C.
    two are turning pairs and two are sliding pairs
    D.
    three are turning pairs and one is a sliding pair

  9. The mechanism consisting of three turning pairs and one sliding pair, is called a

  10. A.
    single slider crank chain
    B.
    Whitworth quick return motion mechanism
    C.
    crank and slotted lever quick return motion mechanism
    D.
    all of the above

  11. A system of masses rotating in different parallel planes is in dynamic balance if the

  12. A.
    resultance force is equal to zero
    B.
    resultant couple is equal to zero
    C.
    resultant force and resultant couple are both equal to zero
    D.
    resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero

  13. The velocity of sliding __________ the distance of the point of contact from the pitch point.

  14. A.
    is directly proportional to
    B.
    is inversely proportional to
    C.
    is equal to cos φ multiplied by
    D.
    does not depend upon

  15. The radial distance from the top of a tooth to the bottom of a tooth in a meshing gear, is called

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

  17. A simple spring-mass vibrating system has a natural frequency of fn. If the spring stiffness is halved and the mass is doubled, then the natural frequency will become

  18. A.
    fn/2
    B.
    2 fn
    C.
    4 fn
    D.
    8 fn

  19. The frictional torque transmitted in a truncated conical pivot bearing, considering uniform pressure, is

  20. A.
    μ W cosec α (r1 + r2)
    B.
    μ W cosec α (r1 + r2)
    C.
    μ W cosec α
    D.
    μ W cosec α