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  • Question

  • For lifting a load of 50 kg through a distance of 2.5 cm, an effort of 12.5 kg is moved through a distance of 40 cm. The efficiency of the lifting machine, is


  • Options
  • A. 60%
  • B. 65%
  • C. 70%
  • D. 75%.

  • Correct Answer
  • 75%. 

    • Applied Mechanics problems

    Search Results

    • 1. The velocity of a moving body, is

    • Options
    • A. a vector quantity
    • B. a scalar quantity
    • C. a scalar as well as a vector quantity
    • D. none of these.
      • Discuss
    • 2. A projectile is fired with a velocity of 100.3 m/sec. at an elevation of 60°. The velocity attained by the projectile when it is moving at a height of 100 m, is

    • Options
    • A. 70 m/sec.
    • B. 75 m/sec.
    • C. 80 m/sec.
    • D. 85 m/sec.
    • E. 90 m/sec.
      • Discuss
    • 3. The following statement is one of the laws of Dynamic friction

    • Options
    • A. The force of friction always acts in a direction opposite to that in which a body is moving
    • B. The magnitude of the kinetic friction bears a constant ratio to the normal reaction between two surfaces. The ratio being slightly less than that in the case of limiting friction
    • C. For moderate speeds the force of friction remains constant but decreases slightly with the increase of speed
    • D. all the above.
      • Discuss
    • 4. A 50 kg boy climbs up a 8 m rope in gymnasiam in 10 sec. The average power developed by the boy is approximately

    • Options
    • A. 400 watts
    • B. 500 watts
    • C. 4000 watts
    • D. none of these.
      • Discuss
    • 5. The ratio of the reactions RA and RB of a simply supported beam shown in below figure is

    • Options
    • A. 0.50
    • B. 0.40
    • C. 0.67
    • D. 1.00
    • E. 1.50
      • Discuss
    • 6. For maximum range of a projectile, the angle of projection should be

    • Options
    • A. 30°
    • B. 45°
    • C. 60°
    • D. none of these.
      • Discuss
    • 7. The velocity ratio of the differential wheel and axle is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 8. The ratio of the ranges on the inclined plane with motion upward and with motion downward for a given velocity, angle of projection will be

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 9. The inherent property of a body which offers reluctance to change its state of rest or uniform motion, is

    • Options
    • A. weight
    • B. mass
    • C. interia
    • D. momentum.
      • Discuss
    • 10. A pilot flies a small plane in a vertical loop of radius r. At the top of its trajectory he experiences weightlessness. If the acceleration due to gravity is g, the speed of the plane at the top of its trajectory would be

    • Options
    • A. zero
    • B. infinite
    • C. gr
    • D. 2gr.
      • Discuss

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