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  • Question
  • In under damped vibrating system, the amplitude of vibration


  • Options
  • A. decreases linearly with time
  • B. increases linearly with time
  • C. decreases exponentially with time
  • D. increases exponentially with time

  • Correct Answer
  • decreases exponentially with time 


  • Theory of machines problems


    Search Results


    • 1. The frictional torque transmitted in a multi-collared shaft is same as that of a single collared shaft.

    • Options
    • A. Right
    • B. Wrong
    • Discuss
    • 2. The centre distance between two meshing involute gears is equal to

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 3. When a particle moves round the circumference of a circle of radius r with ? rad/s, then its maximum acceleration is ?2r.

    • Options
    • A. Right
    • B. Wrong
    • Discuss
    • 4. In order to give the primary balance of the reciprocating parts of a multi-cylinder in-line engines,

    • Options
    • A. the algebraic sum of the primary forces must be equal to zero
    • B. the algebraic sum of the couples about any point in the plane of the primary forces must be equal to zero
    • C. both (a) and (b)
    • D. none of these
    • Discuss
    • 5. In railway axle boxes, the bearing used is

    • Options
    • A. deep groove ball bearing
    • B. double row self-aligning ball bearing
    • C. double row spherical roller bearing
    • D. cylindrical roller bearing
    • Discuss
    • 6. A mass of 1 kg is attached to the end of a spring with a stiffness of 0.7 N/mm. The critical damping coefficient of this system is

    • Options
    • A. 1.4 N-s/m
    • B. 18.52 N-s/m
    • C. 52.92 N-s/m
    • D. 529.2 N-s/m
    • Discuss
    • 7. A disturbing mass m1 attached to the rotating shaft may be balanced by a single mass m2 attached in the same plane of rotation as that of m1, such that (where r1 and r2 are the radii of rotation of m1 and m2 respectively)

    • Options
    • A. m1r2 = m2r1
    • B. m1r1 = m2r2
    • C. m1m2 = r1r2
    • D. none of these
    • Discuss
    • 8. The primary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is

    • Options
    • A. 0° and 90°
    • B. 0° and 180°
    • C. 90° and 180°
    • D. 180° and 360°
    • Discuss
    • 9. A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of

    • Options
    • A. 2 mm
    • B. 2.22 mm
    • C. 2.50 mm
    • D. 3.0 mm
    • Discuss
    • 10. The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the

    • Options
    • A. pitch circle
    • B. base circle
    • C. pitch curve
    • D. prime circle
    • Discuss


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