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  • Question

  • 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

  • Correct Answer
  • m1r1 = m2r2 

    • Theory of machines problems

    Search Results

    • 1. 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
    • 2. 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
      • Discuss
    • 3. The frictional torque transmitted in a multi-collared shaft is same as that of a single collared shaft.

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

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 5. 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
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. A pair of friction discs is an example of rolling pair.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. The sliding pairs, turning pairs and screw pairs form lower pairs.

    • Options
    • A. True
    • B. False
      • Discuss

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