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Mechanical Engineering :: Theory of Machine

  1. Pitch point of a cam is

  2. A.
    a point on the pitch curve having minimum pressure angle
    B.
    a point on the pitch curve having maximum pressure angle
    C.
    any point on the pitch curve
    D.
    any point on the pitch circle

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  3. A torsional system with discs of moment of inertia I1 and I2 as shown in the below figure, is gear driven such that the ratio of speed of shaft B to shaft A is 'G'. Neglecting the inertia of gears, the equivalent inertia of disc on shaft B at the speed of shaft A is equal to

  4. A.
    G.I2
    B.
    G2.I2
    C.
    I2/G
    D.
    I2/G2

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  5. A spring controlled governor is said to be isochronous when the controlling force

  6. A.
    increases as the radius of rotation decreases
    B.
    increases as the radius of rotation increases
    C.
    decreases as the radius of rotation increases
    D.
    remains constant for all radii of rotation

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  7. In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. This method will

  8. 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

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  9. The equation of motion for a vibrating system with viscous damping is
    ,
    if the roots of the equation are complex conjugate, then the system will be critically damped.

  10. A.
    Yes
    B.
    No

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  11. The critical speed of a shaft depends upon its

  12. A.
    mass
    B.
    stiffness
    C.
    mass and stiffness
    D.
    stiffness and eccentricity

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  13. Which of the following mechanism is an approximate straight line motion mechanism?

  14. A.
    Watt's mechanism
    B.
    Grasshopper mechanism
    C.
    Robert's mechanism
    D.
    all of these

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  15. A shaft carrying two rotors at its ends will have

  16. A.
    no node
    B.
    one node
    C.
    two nodes
    D.
    three nodes

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  17. When a mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, then it will

  18. A.
    return to equilibriumposition without oscillation
    B.
    oscillate with increasing time period
    C.
    oscillate with decreasing amplitude
    D.
    oscillate with constant amplitude

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  19. The friction experienced by a body, when at rest, is known as static friction.

  20. A.
    Yes
    B.
    No

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