The factional torque for square thread at the mean radius r while raising load W is given by

  • AT = W.r tan(φ - α)
  • BT = W.r tan(φ + α)
  • CT = W.r tanα
  • DT = W.r tanφ
Correct Answer : (B)

T = W.r tan(φ + α)

Hints :

The lower pairs are _________ pairs



For an involute gear, the ratio of base circle radius and pitch circle radius is equal to

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