Applied Mechanics MCQs with answers Page - 2

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Q. M.I. of sphere of 0.5 m radius about a mutually perpendicular axis (Z-axis) when its M.I. about X-axis and Y-axis are 50 kgm2 and 50 kgm2 is

  • (A) 50 Kgm2
  • (B) Tapered bearing
  • (C) 100 Kgm2
  • (D) 25 Kgm2

A

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Q. A 100 kg flywheel having a radius of gyration of 1 m is rotating at 1000 rpm. The angular momentum of the flywheel about its axis of rotation, in kg m2/s is

  • (A) 1000
  • (B) 107 dynes
  • (C) 10,000
  • (D) 10,470

A

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Q. When a train is rounding a curve to prevent side thrust on the wheel flanges of cars

  • (A) Opposite thrust is created to counter balance this thrust
  • (B) Guide rail sections are provided to take care of thrust
  • (C) Thrust eliminators are provided in the train
  • (D) Outside rails are realised

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Q. The resultant of coplaner parallel forces is found by load line diagram, while the position is found by

  • (A) link polygen
  • (B) funicular polygon
  • (C) string polygon
  • (D) any of the above

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Q. Two forces of 6 and 8 kg act at right angles to each other, the resultant force will be

  • (A) 100
  • (B) 28
  • (C) 41
  • (D) 10

A

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Q. A weight of 4.9 N rests on a rough horizontal floor that has a coefficient of friction of 0.5. If g = 9.8 m/s2, the smallest horizontal force that gives the weight an acceleration of 4m/s2 is most nearly

  • (A) 2.5 N
  • (B) 3 N
  • (C) 2 N
  • (D) 4.5 N

A

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Q. A bob of simple pendulum oscillating in air is made to oscillate in oil. The time period will

  • (A) Increase
  • (B) Decrease
  • (C) Not change
  • (D) Decrease but reduction depends on viscosity of oil

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Q. Minimum horsepower of pump required for filling 50m3 water tank, 20 metres high from ground in 30 minutes by lifting water from a well 5 metres below the ground level is

  • (A) 5.45 KW
  • (B) 7.5 KW
  • (C) 6.81 KW
  • (D) Tapered bearing

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