Inerference, Undercutting & Backlash MCQ

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• A planetary gear train is shown in the figure. Number of teeth on the sun gear A, planet gear B and fixed ring gear D are given by 30, 70 and 140 respectively. Module is taken as 5mm. Calculate the shaft angle for opposite hand of helix if helix angle of two gears are 20⁰ and 17⁰.
  ক

  17⁰

  খ

  20⁰

  গ

  37⁰

  ঘ

  3⁰
• A planetary gear train is shown in the figure. Number of teeth on the sun gear A, planet gear B and fixed ring gear D are given by 30, 70 and 140 respectively. Module is taken as 5mm. A pair of spur gears consist of 25 teeth pinion meshing with a 115 teeth gear. The module is 5mm. Calculate the gear ratio.
  ক

  5

  খ

  4.6

  গ

  5.2

  ঘ

  4
• A planetary gear train is shown in the figure. Number of teeth on the sun gear A, planet gear B and fixed ring gear D are given by 30, 70 and 140 respectively. Module is taken as 5mm. Calculate the tangential component of gear tooth force.
  ক

  220.6N

  খ

  303.2N

  গ

  454.7N

  ঘ

  633.2N
• A planetary gear train is shown in the figure. Number of teeth on the sun gear A, planet gear B and fixed ring gear D are given by 30, 70 and 140 respectively. Module is taken as 5mm. Calculate the length of the arm C.
  ক

  Missing data

  খ

  250mm

  গ

  330mm

  ঘ

  240mm
• A gear train consist of spur gear as shown. Gear A receives 4kW of power at 750rpm through its shaft and rotates in CW direction. Calculate the tangential gear tooth force. Module of the gear is 5mm.
  ক

  510N

  খ

  526N

  গ

  544N

  ঘ

  None of the listed
• A gear train consist of spur gear as shown. Gear A receives 4kW of power at 750rpm through its shaft and rotates in CW direction. A gear train consist of spur gear as shown. Gear A receives 4kW of power at 750rpm through its shaft and rotates in CW direction. Calculate the torque on the gear C if number of teeth on gear A, B and C are 40, 70 and 30.
  ক

  66N-m

  খ

  68N-m

  গ

  53N-m

  ঘ

  45N-m
• A gear train consist of spur gear as shown. Gear A receives 4kW of power at 750rpm through its shaft and rotates in CW direction. Calculate the torque on the gear B.
  ক

  47N-m

  খ

  51N-m

  গ

  0

  ঘ

  Infinity
• A gear train consist of spur gear as shown. Gear A receives 4kW of power at 750rpm through its shaft and rotates in CW direction. Calculate the torque on the gear A.
  ক

  51N-m

  খ

  48N-m

  গ

  46N-m

  ঘ

  44N-m
• The two teeth have thickness t₁ and t₂. If backlash of t₁ is greater than that of t₂, than
  ক

  t₁ > t₂

  খ

  t₁ < t₂

  গ

  t₁ = t₂

  ঘ

  None of the mentioned
• The amount of backlash depends on
  ক

  Diameteral pitch

  খ

  Module

  গ

  Centre distance

  ঘ

  All of the mentioned
• Backlash is defined as
  ক

  Difference in the width of tooth space and engaging tooth thickness

  খ

  Amount by which engaging tooth thickness exceeds the tooth space

  গ

  Other name for interference

  ঘ

  None of the listed
• Undercutting is consider healthy for the tooth as it eliminates undercutting.
  ক

  True

  খ

  False
• Interference is maximum when the largest pinion is in mesh with the smallest gear.
  ক

  True

  খ

  False
• Interference can be removed by under cutting.
  ক

  True

  খ

  False
• Interference is caused by?
  ক

  Overlapping of tooth profiles

  খ

  Large size of dedendum

  গ

  Meshing of involute and no-involute profiles

  ঘ

  All of the mentioned