Toothed Gearing MCQ

Test your knowledge with important Toothed Gearing MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30+ more Toothed Gearing MCQs on Bissoy. Bissoy App

• For a speed ratio of 100, smallest gear box is obtained by using
  ক

  a pair of spur gears

  খ

  a pair of helical and a pair of spur gear compounded

  গ

  a pair of bevel and a pair of spur gear compounded

  ঘ

  a pair of helical and a pair of worm gear compounded
• The maximum efficiency for spiral gears is
  ক

  sin (θ + φ ) + 1/ cos (θ − φ ) + 1

  খ

  cos (θ − φ) + 1/sin (θ + φ ) + 1

  গ

  cos (θ + φ ) + 1/ cos (θ − φ ) + 1

  ঘ

  cos (θ − φ) + 1/cos (θ + φ ) + 1
• The ratio of face width to transverse pitch of a helical gear with α as the helix angle is normally
  ক

  more than 1.15/tan α

  খ

  more than 1.05/tan α

  গ

  more than 1/tan α

  ঘ

  none of the mentioned
• Interference can be avoided in involute gears with 20° pressure angle by
  ক

  cutting involute correctly

  খ

  using as small number of teeth as possible

  গ

  using more than 20 teeth

  ঘ

  using more than 8 teeth
• When the addenda on pinion and wheel is such that the path of approach and path of recess are half of their maximum possible values, then the length of the path of contact is given by
  ক

  (r + R) sin φ/2

  খ

  (r + R) cos φ/2

  গ

  (r + R) tan φ/2

  ঘ

  (r + R) cot φ/2
• The maximum length of arc of contact for two mating gears, in order to avoid interference, is
  ক

  (r + R) sin φ

  খ

  (r + R) cos φ

  গ

  (r + R) tan φ

  ঘ

  none of the mentioned
• The contact ratio for gears is
  ক

  zero

  খ

  less than one

  গ

  greater than one

  ঘ

  none of the mentioned
• Involute profile is preferred to cyloidal because
  ক

  the profile is easy to cut

  খ

  only one curve is required to cut

  গ

  the rack has straight line profile and hence can be cut accurately

  ঘ

  none of the mentioned
• Law of gearing is satisfied if
  ক

  two surfaces slide smoothly

  খ

  common normal at the point of contact passes through the pitch point on the line joining the centres of rotation

  গ

  number of teeth = P.C.D. / module

  ঘ

  addendum is greater than dedendum
• The condition of correct gearing is
  ক

  pitch line velocities of teeth be same

  খ

  radius of curvature of two profiles be same

  গ

  common normal to the pitch surface cuts the line of centres at a fixed point

  ঘ

  none of the mentioned
• Mitre gears are used for
  ক

  great speed reduction

  খ

  equal speed

  গ

  minimum axial thrust

  ঘ

  minimum backlash
• If the module of a gear be m, the number of teeth T and pitch circle diameter D, then
  ক

  m = D/T

  খ

  D = T/m

  গ

  m = D/2T

  ঘ

  none of the mentioned
• Which is the incorrect relationship of gears?
  ক

  Circular pitch × Diametral pitch = π

  খ

  Module = P.C.D/No.of teeth

  গ

  Dedendum = 1.157 module

  ঘ

  Addendum = 2.157 module
• The module is the reciprocal of
  ক

  diametral pitch

  খ

  circular pitch

  গ

  pitch diameter

  ঘ

  none of the mentioned
• The product of the diametral pitch and circular pitch is equal to
  ক

  1

  খ

  1/π

  গ

  π

  ঘ

  2π
• The radial distance of a tooth from the pitch circle to the bottom of the tooth, is called
  ক

  dedendum

  খ

  addendum

  গ

  clearance

  ঘ

  working depth
• The size of a gear is usually specified by
  ক

  pressure angle

  খ

  circular pitch

  গ

  diametral pitch

  ঘ

  pitch circle diameter
• An imaginary circle which by pure rolling action, gives the same motion as the actual gear, is called
  ক

  addendum circle

  খ

  dedendum circle

  গ

  pitch circle

  ঘ

  clearance circle
• The type of gears used to connect two non-parallel non-intersecting shafts are
  ক

  spur gears

  খ

  helical gears

  গ

  spiral gears

  ঘ

  none of the mentioned
• The two parallel and coplanar shafts are connected by gears having teeth parallel to the axis of the shaft. This arrangement is called
  ক

  spur gearing

  খ

  helical gearing

  গ

  bevel gearing

  ঘ

  spiral gearing