Friction in Journal Bearing- Friction Circle MCQ

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• The efficiency of the a screw jack is maximum, when
  ক

  α = 450 + ɸ/2

  খ

  α = 450 – ɸ/2

  গ

  α = 900 + ɸ

  ঘ

  α = 900 – ɸ
• Efficiency of a screw jack is given by
  ক

  tan(α + ɸ)/tanα

  খ

  tanα/ tan(α + ɸ)

  গ

  tan(α – ɸ)/tanα

  ঘ

  tanα/tan(α – ɸ)
• The frictional torque for square thread at the mean radius r while raising load W is given by
  ক

  T = W.rtan(α – ɸ)

  খ

  T = W.rtan(α + ɸ)

  গ

  T = W.rtanα

  ঘ

  T = W.rtanɸ
• In a screw jack, the effort required to lower the load W is given by
  ক

  P = W tan (α – ɸ)

  খ

  P = W tan (α + ɸ)

  গ

  P = W tan (ɸ – α)

  ঘ

  P = W cos (α + ɸ)
• The coefficient of friction is the ratio of the limiting friction to the normal reaction between the two bodies.
  ক

  True

  খ

  False
• A body of weight W is required to move up the rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by
  ক

  P = W tanα

  খ

  P = W tan (α + ɸ)

  গ

  P = W (sinα + μ cosα)

  ঘ

  P = W (cosα + μ sinα)
• A body will begin to move down an inclined plane, if the angle of inclination of the plane is ____________ the angle of friction.
  ক

  equal to

  খ

  less than

  গ

  greater than

  ঘ

  none of the mentioned
• The minimum force required to slide a body of weight W on a rough horizontal plane is
  ক

  W sinϴ

  খ

  W cosϴ

  গ

  W tanϴ

  ঘ

  W cosecϴ