Gears MCQ

51. The profile of gears having module of 12 mm and length of are of contact is 60 mm. What is the contact ratio of the gear profile?

  1. 1.2
  2. 2
  3. 5
  4. 1.6
Answer. d

52. In gears, the term pressure angle refers to the angle

  1. between normal to the point of contact and the shaft axis
  2. between normal to the dedendum at the contact point and tangent to the dedendum at the same point
  3. between the line of action and common tangent to pitch surface in the plane of rotation of obliquity
  4. between the tangent drawn at the contact point of mating gears
Answer. c

53. Traveling distance made by one revolution of a pinion is obtained from the calculation

  1. Module × No. of teeth
  2. Module × No. of teeth × π
  3. Module × π
  4. Length × module × No. of teeth
Answer. b

54. Axial thrust is minimum in case of

  1. Spur gear
  2. Bevel gear
  3. Mitre gear
  4. Double helical gear
Answer. d

55. Which of the following statement is TRUE about the length of arc of contact?

  1. Inversely proportional to the module
  2. Varies directly to the length of the path of contact
  3. Inversely proportional to the circular pitch
  4. All options are correct
Answer. b

56. The product of circular pitch and diametral pitch is equal to

  1. 1
  2. 1.57
  3. π
  4. infinite
Answer. c

57. The profile of the gears is involutes with 200. If the length of path of approach and length of path of recess are 28 mm and 15 mm respectively. What is the length of arc of contact? (cos 20°= 0.94)

  1. 54
  2. 54.4
  3. 56
  4. 56.4
Answer. d

58. In spur gears

  1. Both shafts are parallel
  2. Teeth are straight
  3. Teeth are parallel to axis
  4. All of these
Answer. d

59. The point of contact which is common between the two pitch circles is known as

  1. base line
  2. addendum
  3. dedendum
  4. pitch point
Answer. d

60. The path of contact in cycloidal gear is

  1. straight line
  2. curved line
  3. circle
  4. none of the above
Answer. c

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