Minimum Number of Teeth on a Pinion for Involute Rack in Order to Avoid Interference MCQ

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• When the axes of the shafts, over which the gears are mounted, move relative to a fixed axis, then the train is known as reverted gear train.
  ক

  True

  খ

  False
• When the axes of the first and the last wheels are co-axial, then the train is known as
  ক

  simple train of wheels

  খ

  compound train of wheels

  গ

  reverted gear train

  ঘ

  epicyclic gear train
• In a simple train of wheels, the velocity ratio _____________ the intermediate wheels.
  ক

  depends upon

  খ

  is independent of

  গ

  is equal to

  ঘ

  none of the mentioned
• In a simple train of wheels, if the number of intermediate wheels is odd, the motion of the follower will be same as that of the driver.
  ক

  True

  খ

  False
• The maximum efficiency of spiral gears is
  ক

  sin (ϴ + ɸ) + 1/cos(ϴ – ɸ) +1

  খ

  cos(ϴ – ɸ) +1/sin (ϴ + ɸ) + 1

  গ

  cos (ϴ + ɸ) + 1/cos(ϴ – ɸ) +1

  ঘ

  cos(ϴ – ɸ) +1/cos (ϴ + ɸ) + 1
• The interference may only be avoided if the addendum circles of the two mating gears cut the common tangent to the base circles between the points of tangency.
  ক

  True

  খ

  False
• Which of the following statement is correct for involute gears?
  ক

  The interference is inherently absent

  খ

  The variation in centre distance of shafts increases radial force

  গ

  A convex flank is always in contact with concave flank

  ঘ

  The pressure angle is constant throughout the teeth engagement
• An involute pinion and gear are in mesh. If both have the same size of addendum, then there will be an interference between the
  ক

  tip of the gear tooth and flank of pinion

  খ

  tip of the pinion and flank of gear

  গ

  flanks of both gear and pinion

  ঘ

  tip of both gear and pinion
• In gears, interference takes place when
  ক

  the tip of a tooth of a mating gear digs into the portion between base and root circles

  খ

  gears do not move smoothly in the absence of lubrication

  গ

  pitch of the gears is not same

  ঘ

  gear teeth are undercut
• The minimum number of teeth on the pinion which will mesh with any gear without interference for 200 full depth involute teeth will be
  ক

  12

  খ

  14

  গ

  18

  ঘ

  24