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  • Question

  • A load of 500 kg was lifted through a distance of 13 cm. by an effort of 25 kg which moved through a distance of 650 cm. The efficiency of the lifting machine is


  • Options
  • A. 50%
  • B. 40%
  • C. 55%
  • D. 30%.

  • Correct Answer
  • 40% 

    • Applied Mechanics problems

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    • 1. The locus of the instantaneous centre of a moving rigid body, is

    • Options
    • A. straight line
    • B. involute
    • C. centroid
    • D. spiral.
      • Discuss
    • 2. If the gravitational accelerational at any place is doubled, the weight of a body, will

    • Options
    • A. be reduced to half
    • B. be doubled
    • C. not be affected
    • D. none of these.
      • Discuss
    • 3. The equation of motion of a particle starting from rest along a straight line is x = t3 - 3t2 + 5. The ratio of the accelerations after 5 sec and 3 sec will be

    • Options
    • A. 2
    • B. 3
    • C. 4
    • D. 5
      • Discuss
    • 4. When a body in equilibrium undergoes an infinitely small displacement, work imagined to be done, is known as

    • Options
    • A. imaginary work
    • B. negative work
    • C. virtual work
    • D. none of these.
      • Discuss
    • 5. The c.g. of the shaded area of the below figure whose curve OM is a parabola from y-axis, is

    • Options
    • A.
    • B.
    • C.
    • D.
    • E.
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    • 6. Two forces act an angle of 120°. If the greater force is 50 kg and their resultant is perpendicular to the smaller force, the smaller force is

    • Options
    • A. 20 kg
    • B. 25 kg
    • C. 30 kg
    • D. 35 kg
    • E. 40 kg.
      • Discuss
    • 7. The vertical reaction at the support A of the structure shown in below figure, is

    • Options
    • A. 1 t
    • B. 2 t
    • C. 3 t
    • D. 2.5 t.
      • Discuss
    • 8. Parallelogram Law of Forces states, "if two forces acting simultaneously on a particle be represented in magnitude and direction by two adjacent sides of a parallelogram, their resultant may be represented in magnitude and direction by

    • Options
    • A. its longer side"
    • B. its shorter side"
    • C. the diagonal of the parallelogram which does not pass through the point of intersection of the forces"
    • D. the diagonal of the parallelogram which passes through the point of intersection of the forces"
    • E. half the sum of the diagonals".
      • Discuss
    • 9. Engineer's units of force, is

    • Options
    • A. Newton in absolute units
    • B. Dyne in absolute units
    • C. Newton and dyne in absolute units
    • D. All the above.
      • Discuss
    • 10. To attain the synchronous orbit, the launch of a satellite, is done from a place

    • Options
    • A. on equator
    • B. on 30° latitude
    • C. on 45° latitude
    • D. on 60° latitude
    • E. on the poles.
      • Discuss

    Comments

    Avatar
    Siddhi Rajendra ghuge
    Mechanical advantage (MA) = Load (W)/Effort (P). MA = W/P = 500/25 = 20. Velocity ratio (VR) = (Distance moved by the effort (Y))/(Distance moved by the load (X)). VR = Y/X = 650/13 = 50. Efficiency = MA/VR = 20/50 = 40%. 40 % is the correct ans
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