Standard Spur Gears-1 MCQ

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• The load on a gear tooth is 50 kN. If the gear is transmitting a torque of 6000 Nm, the diameter of the gear is approximately
  ক

  0.5 m

  খ

  0.75 m

  গ

  1 m

  ঘ

  0.25 m
• A planetary gear train is gear train having
  ক

  a relative motion of axes and the axis of at least one of the gears also moves relative to the frame

  খ

  no relative motion of axes and no relative motion of axes with respect to the frame

  গ

  no relative motion of axes and the axis of at least one of the gears also moves relative to the frame

  ঘ

  a relative motion of axes and none of the axes of gears has relative motion with the frame
• The use of straight or curved external gear teeth in mesh with internal teeth in gear and spline couplings is specifically employed accommodate
  ক

  torsional misalignment

  খ

  parallel misalignment

  গ

  angular misalignment

  ঘ

  substantial axial movements between shafts
• A worm gear set is designed to have pressure angle of 300 which is equal to the helix angle. The efficiency of the worm gear set at an interface friction of 0.05 is
  ক

  87.9%

  খ

  77.9%

  গ

  67.9%

  ঘ

  57.9%
• In case the number of teeth on two bevel gears in mesh is 30 and 60 respectively, then the pitch cone angle of the gear will be
  ক

  tan-12

  খ

  п/2 + tan-12

  গ

  п/2 – tan-10.5

  ঘ

  tan-10.5
• In skew bevel gears, the axes are
  ক

  non-parallel and non-intersecting, and teeth are curved

  খ

  non-parallel and non-intersecting, and teeth are straight

  গ

  intersecting, and teeth are curved and oblique

  ঘ

  intersecting, and teeth are curved and can be ground
• For a pair of gears in mesh, pressure angle and module must be different to satisfy the condition of interchangeability and correct gearing.
  ক

  True

  খ

  False
• Lewis equation for design of involute gear tooth predicts the dynamic load capacity of a cantilever beam of uniform strength.
  ক

  True

  খ

  False