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  • Question

  • 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

  • Correct Answer
  • pitch curve 

    • Theory of machines problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. A pair of friction discs is an example of rolling pair.

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

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. The two elements of a pair are said to form a __________ when they permit relative motion between them.

    • Options
    • A. open pair
    • B. kinematic pair
      • Discuss
    • 9. The electrodes used in spot welding have a tip of

    • Options
    • A. stainless steel
    • B. aluminium
    • C. copper
    • D. brass
      • Discuss
    • 10. The blank diameter used in thread rolling will be

    • Options
    • A. equal to minor diameter of the thread
    • B. equal to pitch diameter of the thread
    • C. a little larger than the minor diameter of the thread
    • D. a little larger than the pitch diameter of the thread
      • Discuss

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