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Mechanical Engineering :: Theory of Machine

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


  2. The size of a gear is usually specified by

  3. A.
    pressure angle
    B.
    circular pitch
    C.
    diametral pitch
    D.
    pitch circle diameter

  4. The example of successfully constrained motion is a

  5. A.
    motion of an I.C. engine valve
    B.
    motion of the shaft between a foot-step bearing
    C.
    piston reciprocating inside an engine cylinder
    D.
    all of the above

  6. The angle which the normal reaction makes with the resultant reaction is called angle of friction.

  7. A.
    Agree
    B.
    Disagree

  8. Which one of the following can completely balance several masses revolving in different planes on a shaft?

  9. A.
    A single mass in different planes
    B.
    Two masses in any two planes
    C.
    A single mass in one of the planes of the revolving masses
    D.
    Two equal masses in any two planes

  10. When a shaking force is transmitted through the springs, damping becomes detrimental when the ratio of its frequency to the natural frequency is greater than

  11. A.
    0.25
    B.
    0.5
    C.
    1
    D.
    2

  12. When the nature of contact between the elements of a pair is such that it can turn or revolve about a fixed axis, the pair is known as a rolling pair.

  13. A.
    Correct
    B.
    Incorrect

  14. Creep in belt drive is due to

  15. A.
    weak material of the belt
    B.
    weak material of the pulley
    C.
    uneven extensions and contractions of the belt when it passes from tight side to slack side
    D.
    expansion of the belt

  16. Which of the following statement is wrong?

  17. A.
    A round bar in a round hole form a turning pair
    B.
    A square bar in a square hole form a sliding pair
    C.
    A vertical shaft in a foot step bearing forms a successful constraint
    D.
    all of the above

  18. A watt's governor can work satisfactorily at speeds from

  19. A.
    60 to 80 r.p.m.
    B.
    80 to 100 r.p.m.
    C.
    100 to 200 r.p.m.
    D.
    200 to 300 r.p.m.