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Mechanical Engineering :: Theory of Machine

  1. The pitching of a ship produces forces on the bearings which act __________ to the motion of the ship.

  2. A.
    vertically and parallel
    B.
    vertically and perpendicular
    C.
    horizontally and parallel
    D.
    horizontally and perpendicular

  3. The contact ratio is given by


  4. At the node, the shaft remains unaffected by the vibration.

  5. A.
    Agree
    B.
    Disagree

  6. The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω1 rad/s in the clockwise direction and the link OB turns with angular velocity ω2 rad/s in the anti-clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

  7. A.
    ω12.r
    B.
    ( ω1 - ω2)r
    C.
    ( ω1 + ω2)r
    D.
    ( ω1 - ω2)2r

  8. When the two elements of a pair have __________ when in motion, it is said to a lower pair.

  9. A.
    line or point contact
    B.
    surface contact

  10. The sensitiveness of a governor depends upon the lift of the sleeve.

  11. A.
    Right
    B.
    Wrong

  12. The ratio of maximum fluctuation of energy to the workdone per cycle is called

  13. A.
    fluctuation of energy
    B.
    maximum fluctuation of energy
    C.
    coefficient of fluctuation of energy
    D.
    none of these

  14. In a steam engine, the earlier cut-off with a simple slide valve may be obtained by increasing the steam lap and the angle of advance of the eccentric but keeping constant the travel and lead of the valve, This method will

  15. A.
    cause withdrawing or throttling of steam
    B.
    reduce length of effective stroke of piston
    C.
    reduce maximum opening of port to steam
    D.
    all of these

  16. The centre of suspension and centre of percussion are not interchangeable.

  17. A.
    Correct
    B.
    Incorrect

  18. The size of cam depends upon

  19. A.
    base circle
    B.
    pitch circle
    C.
    prime circle
    D.
    pitch curve