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  • Question

  • A machine having an efficiency less than 50%, is known as


  • Options
  • A. reversible machine
  • B. non-reversible machine
  • C. neither reversible nor non-reversible machine
  • D. ideal machine

  • Correct Answer
  • non-reversible machine 

    • Engineering Mechanics problems

    Search Results

    • 1. If three forces acting at a point are represented in magnitude and direction by the three sides of a triangle, taken in order, then the forces are in equilibrium.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 2. The potential energy of a vertically raised body is __________ the kinetic energy of a vertically falling body.

    • Options
    • A. equal to
    • B. less than
    • C. greater than
      • Discuss
    • 3. The acceleration of a particle moving with simple harmonic motion, at any instant is given by

    • Options
    • A. ?.y
    • B. ?2.y
    • C. ?2 /y
    • D. ?3.y
      • Discuss
    • 4. The minimum force required to slide a body of weight W on a rough horizontal plane is

    • Options
    • A. W sin ?
    • B. W cos ?
    • C. W tan ?
    • D. none of these
      • Discuss
    • 5. The motion of a particle round a fixed axis is

    • Options
    • A. translatory
    • B. rotary
    • C. circular
    • D. translatory as well as rotatry
      • Discuss
    • 6. The loss of kinetic energy during elastic impact is zero.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 7. Newton's second law motion __________ a relation between force and mass of a moving body.

    • Options
    • A. gives
    • B. does not give
      • Discuss
    • 8. Moment of inertia of a triangular section of base (b) and height (h) about an axis through its base, is

    • Options
    • A. bh3/4
    • B. bh3/8
    • C. bh3/ 12
    • D. bh3/ 36
      • Discuss
    • 9. If a given force (or a given system of forces) acting on a body __________ the position of the body, but keeps it in equilibrium, then its effect is to produce internal stress in the body.

    • Options
    • A. change
    • B. does not change
      • Discuss
    • 10. If u1 and u2 are the velocities of two moving bodies in the same direction before impact and v1 and v2 are their velocities after impact, then coefficient of restitution is given by

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss

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