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  • Question

  • The maximum efficiency of a screw jack is


  • Options
  • A. The maximum efficiency of a screw jack is
  • B. The maximum efficiency of a screw jack is
  • C. The maximum efficiency of a screw jack is
  • D. The maximum efficiency of a screw jack is

  • Correct Answer
  •  

    • Engineering Mechanics problems

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    • 1. A lift moves downwards with an acceleration of 9.8 m/s2. The pressure exerted by a man on the floor of the lift is zero.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. According to the law of moments, if a number of coplaner forces acting on a particle are in equilibrium, then

    • Options
    • A. their algebraic sum is zero
    • B. their lines of action are at equal distances
    • C. the algebraic sum of their moments about any point in their plane is zero
    • D. the algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point.
      • Discuss
    • 3. The moment of inertia of a square of side a about its diagonal is

    • Options
    • A. a2/8
    • B. a3/12
    • C. a4/12
    • D. a4/16
      • Discuss
    • 4. Tension in the cable supporting a lift is more when the lift is moving __________ with an acceleration.

    • Options
    • A. upwards
    • B. downwards
      • Discuss
    • 5. Two bodies of masses m1,and m2 are hung from the ends of a rope, passing oyer a frictionless pulley as shown in the figure below. The acceleration of the string will be

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 6. The resultant of two forces P and Q acting at an angle ? is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 7. The total momentum of a system of masses (i. e. moving bodies) in any one direction remains constant, unless acted upon by an external force in that direction. This statement is called

    • Options
    • A. Newton's first law of motion
    • B. Newton's second law of motion
    • C. principle of conservation of energy
    • D. principle of conservation of momentum
      • Discuss
    • 8. A newton is defined as the force while acting upon a mass of one kg, produces an acceleration of 1 m / s2 in the direction of which it acts.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 9. A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is

    • Options
    • A. reversible
    • B. non-reversible
    • C. ideal
      • Discuss
    • 10. Non-coplaner concurrent forces are those forces which

    • Options
    • A. meet at one point, but their lines of action do not lie on the same plane
    • B. do not meet at one point and their lines of action do not lie on the same plane
    • C. meet at one point and their lines of action also lie on the same plane
    • D. do not meet at one point, but their lines of action lie on the same plane
      • Discuss

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