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Engineering Mechanics problems

  • 1. The efficiency of a screw jack is maximum, when(where ? = Helix angle, and ? = Angle of friction.)

  • Options
  • A. ? = 45° + ?/2
  • B. ? = 45° - ?/2
  • C. ? = 90° + ?
  • D. ? = 90° - ?
    • Discuss
  • 2. Mechanical Engineering Engineering Mechanics: The above figure s
    The above figure shows the three coplaner forces P, Q and R acting at a point O. If these forces are in equilibrium, then

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 3. The range of projectile(R) on an upward inclined plane is

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 4. In a wormed geared pulley block, if the number of teeth on the worm wheel is doubled, then its velocity ratio is also doubled.

  • Options
  • A. True
  • B. False
    • Discuss
  • 5. In a framed structure, as shown in the below figure, the force in the member CD is tensile in nature.
    Mechanical Engineering Engineering Mechanics: In a framed structure, as shown in the below figure, the force in the member CD is tensile in

  • Options
  • A. Agree
  • B. Disagree
    • Discuss
  • 6. The moment of inertia of a solid cylinder of mass m, radius r and length l about the longitudinal axis or polar axis is

  • Options
  • A. mr2/2
  • B. mr2/4
  • C. mr2/6
  • D. mr2/8
    • Discuss
  • 7. The acceleration of a particle moving with simple harmonic motion is __________ at themean position.

  • Options
  • A. zero
  • B. minimum
  • C. maximum
    • Discuss
  • 8. The velocity of a particle moving with simple harmonic motion is __________ at the mean position.

  • Options
  • A. zero
  • B. minimum
  • C. maximum
    • Discuss
  • 9. The centre of gravity of a hemisphere lies at a distance of 3r / 8 from its base measured along the vertical radius.

  • Options
  • A. Correct
  • B. Incorrect
    • Discuss
  • 10. In order to double the period of simple pendulum, the length of the string should be

  • Options
  • A. halved
  • B. doubled
  • C. quadrupled
    • Discuss

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