Helical Gears MCQ

Test your knowledge with important Helical Gears MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Helical Gears MCQs at Bissoy

• For two gears having shaft angle 90° and friction angle 6°, find the maximum efficiency of the helical gears.
  ক

  89.23%

  খ

  85.64%

  গ

  79.02%

  ঘ

  81.07%
• The normal circular pitch of two helical gears in a mesh is 7 mm. If the number of teeth on the smaller gear is 22 and the gear ratio is 2, find the pitch diameters of the gears. Ψ1 = 40° and Ψ2 = 25°.
  ক

  83.01 mm, 109.93 mm

  খ

  63.99 mm, 108.17 mm

  গ

  85.34 mm, 96.32 mm

  ঘ

  79.12 mm, 100.13 mm
• Find the normal circular pitch as well as the normal module if the larger gear has 40 teeth and the gear ratio is 4. The helix angle is 20° and the shaft angle is 50°. Assume the centre distance between the gears to be 200 mm.
  ক

  22.12 mm, 7.04 mm

  খ

  21.31 mm, 6.78 mm

  গ

  20.37 mm, 6.48 mm

  ঘ

  21.98 mm, 6.996 mm
• Find the spiral angles of the two helical gears for maximum efficiency if the shaft angle is 100° and the friction angle is 10°.
  ক

  55°,55°

  খ

  50°,50°

  গ

  55°,45°

  ঘ

  65°,45°
• The shaft angle of two helical gears is 60°. The normal module is 6 mm. The larger gear has 50 teeth and the gear ratio is 2. The centre distance is 300 mm. Find the helix angles of the two gears.
  ক

  Ψ1 = 11.68°, Ψ2 = 48.32°

  খ

  Ψ1 = 13.02°, Ψ2 = 46.98°

  গ

  Ψ1 = 10.11°, Ψ2 = 49.89°

  ঘ

  Ψ1 = 12.21°, Ψ2 = 47.79°
• The centre distance between two meshing gears is 250 mm and the angle between the shafts is 60°. The normal circular pitch is 10 mm and the gear ratio is 2. Ψ1 = 35°.Find the efficiency if the friction angle is 6°.
  ক

  89.23 %

  খ

  91.02 %

  গ

  88.58 %

  ঘ

  85.69 %
• The centre distance between two meshing gears is 250 mm and the angle between the shafts is 60°. The normal circular pitch is 10 mm and the gear ratio is 2. Ψ1 = 35°. Find the exact centre distance.
  ক

  248.992 mm

  খ

  250.934 mm

  গ

  251.831 mm

  ঘ

  251.029 mm
• The centre distance between two meshing gears is 250 mm and the angle between the shafts is 60°. The normal circular pitch is 10 mm and the gear ratio is 2. Ψ1 = 35°. Find the value of number of teeth on both the wheels.
  ক

  46,92

  খ

  45, 90

  গ

  54,108

  ঘ

  62, 124
• Two spiral gears have a normal module of 10 mm and the angle between the skew shaft axes is 50°. The driver has 20 teeth and the helix angle of it is 30°. If the velocity ratio is 1/3 and the driver as well as the follower are both left handed, find the centre distance between the shafts.
  ক

  434.72 mm

  খ

  452.83 mm

  গ

  582.19 mm

  ঘ

  523.39 mm
• The shortest distance measured along the normal to the helix between corresponding points on the adjacent teeth is called ____________
  ক

  gear pitch

  খ

  helical pitch

  গ

  circular pitch

  ঘ

  normal circular pitch
• The distance between the corresponding points on adjacent teeth measured on the pitch circle is called ______________
  ক

  helical pitch

  খ

  normal pitch

  গ

  gear pitch

  ঘ

  circular pitch
• The angle at which the teeth of the gear are inclined to the axis of a gear is called as __________
  ক

  pitch angle

  খ

  normal angle

  গ

  helix angle

  ঘ

  gear angle
• Identify the given gear.
  ক

  Spur gear

  খ

  Helical gear

  গ

  Worm and worm gear

  ঘ

  Bevel gear
• If tangential component of force on tooth is 200N and helix angle is 25⁰, calculate the axial component of the force.
  ক

  200N

  খ

  302.5N

  গ

  93.26N

  ঘ

  215.6N
• The direction of tangential component for a driving gear is same to the direction of rotation.
  ক

  True

  খ

  False
• A pair of parallel helical gears consist of 15 teeth pinion meshing with a 40 teeth gear. The helix angle is 22⁰ and normal pressure angle 19⁰. The normal module is taken as 4mm. Calculate the dedendum circle diameter of the pinion.
  ক

  64.5mm

  খ

  54.7mm

  গ

  59.2mm

  ঘ

  None of the listed
• A pair of parallel helical gears consist of 15 teeth pinion meshing with a 40 teeth gear. The helix angle is 22⁰ and normal pressure angle 19⁰. The normal module is taken as 4mm. Calculate addendum circle diameter of the pinion.
  ক

  59.2mm

  খ

  72.7mm

  গ

  65.4mm

  ঘ

  None of the listed
• A pair of parallel helical gears consist of 15 teeth pinion meshing with a 40 teeth gear. The helix angle is 22⁰ and normal pressure angle 19⁰. The normal module is taken as 4mm. Calculate the centre distance.
  ক

  125.4mm

  খ

  132.6mm

  গ

  118.65mm

  ঘ

  145.4mm
• A pair of parallel helical gears consist of 15 teeth pinion meshing with a 40 teeth gear. The helix angle is 22⁰ and normal pressure angle 19⁰. The normal module is taken as 4mm. Calculate the pitch circle diameter of the gear.
  ক

  172.6mm

  খ

  142.6mm

  গ

  180.3mm

  ঘ

  202.4mm
• A pair of parallel helical gears consist of 15 teeth pinion meshing with a 40 teeth gear. The helix angle is 22⁰ and normal pressure angle 19⁰. The normal module is taken as 4mm. Calculate the pitch circle diameter of pinion.
  ক

  64.7mm

  খ

  52.6mm

  গ

  56.6mm

  ঘ

  68.8mm
• A pair of parallel helical gears consist of 15 teeth pinion meshing with a 40 teeth gear. The helix angle is 22⁰ and normal pressure angle 19⁰. The normal module is taken as 4mm. Calculate the axial pitch.
  ক

  None of the listed

  খ

  34.2mm

  গ

  33.4mm

  ঘ

  29.6mm
• A pair of parallel helical gears consist of 15 teeth pinion meshing with a 40 teeth gear. The helix angle is 22⁰ and normal pressure angle 19⁰. The normal module is taken as 4mm. Calculate the transverse pressure angle in degrees.
  ক

  17.9

  খ

  20.4

  গ

  19.6

  ঘ

  18.4
• A pair of parallel helical gears consist of 15 teeth pinion meshing with a 40 teeth gear. The helix angle is 22⁰ and normal pressure angle 19⁰. The normal module is taken as 4mm. Calculate the transverse module.
  ক

  4.3mm

  খ

  4.1mm

  গ

  3.9mm

  ঘ

  3.7mm
• Below is a representation of a helical gear. Blue lines in the figure signify?
  ক

  Pinion right handed helical teeth

  খ

  Pinion left handed helical teeth

  গ

  Both right and left handed

  ঘ

  Symmetric helical teeth
• Among the normal module and transverse module, which one has greater value?
  ক

  Normal Module

  খ

  Transverse Module

  গ

  Both have equal module

  ঘ

  Insufficient information
• There is same type of tooth meshing in helical and spur gear.
  ক

  True

  খ

  False
• Among spur gear and helical gear, which has smooth engagement and thus lesser noise?
  ক

  Helical Gears

  খ

  Spur Gears

  গ

  Both have equal noises

  ঘ

  Can’t be determined