Worm Gears MCQ

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

• Calculate the maximum efficiency of the worm gears which have a friction angle of 0.06.
  ক

  88.71%

  খ

  83.23%

  গ

  89.91%

  ঘ

  86.49%
• Find the maximum efficiency if the lead angle is given to be 10° and the coefficient of friction is 0.07.
  ক

  79.82%

  খ

  72.23%

  গ

  76.29%

  ঘ

  70.72%
• Calculate the lead angle of the worm gear for maximum efficiency if θ = 90° and the coefficient of friction is 0.05.
  ক

  48.21°

  খ

  42.23°

  গ

  43.57°

  ঘ

  46.43°
• For a two start worm gear having a pitch of 20 mm and a lead angle 12°, find the centre distance if the larger gear has 25 teeth.
  ক

  148.22 mm

  খ

  124.93 mm

  গ

  121.19 mm

  ঘ

  109.53 mm
• Find the speed of the gear if the worm is a three start worm rotating at 500 rpm. The gear has 20 teeth.
  ক

  125 rpm

  খ

  100 rpm

  গ

  75 rpm

  ঘ

  50 rpm
• Find the helix angle of the worm if the pitch of the worm gear is 12 mm and the pitch diameter is 50 mm.
  ক

  8.687°

  খ

  11.231°

  গ

  9.212°

  ঘ

  10.319°
• What is the formula to calculate maximum efficiency of a worm gear?
  ক

  (1+sinø)/(1-sinø)

  খ

  (1-sinø)/(1+sinø)

  গ

  (tan(λ1-ø))/tan λ1

  ঘ

  (tan(λ1+ø))/tan λ1
• What is the centre distance for the worm gear?
  ক

  (mn/2)(T1 cotλ1 – T2)

  খ

  (mn/2)(T2 cotλ1 + T1)

  গ

  (mn/2)(T2 cotλ1 – T1)

  ঘ

  (mn/2)(T1 cotλ1 + T2)
• What is the velocity ratio of worm gears?
  ক

  (lπ)/d2

  খ

  (πd2)/l

  গ

  l/(πd2)

  ঘ

  d2/(lπ)
• The angle at which the teeth are inclined to the normal of the axis of rotation is called _______________
  ক

  pitch angle

  খ

  lead angle

  গ

  normal angle

  ঘ

  joint angle
• The distance between corresponding points on adjacent teeth measured along the direction of the axis is called ____________
  ক

  joint line

  খ

  normal link

  গ

  axial pitch

  ঘ

  lead
• Which is of these is an advantage of worm gear?
  ক

  It is expensive

  খ

  Has high power losses and low transmission efficiency

  গ

  Produce a lot of heat

  ঘ

  Used for reducing speed and increasing torque
• The driven gear in the worm gear is a helical gear. True or false?
  ক

  True

  খ

  False
• The axial thrust on the worm (WA) is given by
  ক

  WA = WT . tan φ

  খ

  WA = WT / tan φ

  গ

  WA = WT . tan λ

  ঘ

  WA = WT / tan λ
• The number of starts on the worm for a velocity ratio of 40 should be
  ক

  single

  খ

  double

  গ

  triple

  ঘ

  quadruple
• The normal lead, in a worm having multiple start threads, is given by
  ক

  lN = l / cos λ

  খ

  lN = l . cos λ

  গ

  lN = l

  ঘ

  lN = l tan
• In worm gears, the angle between the tangent to the thread helix on the pitch cylinder and the plane normal to the axis of worm is called
  ক

  pressure angle

  খ

  lead angle

  গ

  helix angle

  ঘ

  friction angle
• The worm gears are widely used for transmitting power at ______________ velocity ratios between non-intersecting shafts.
  ক

  high

  খ

  low

  গ

  medium

  ঘ

  none of the mentioned
• For a bevel gear having the pitch angle θ, the ratio of formative number of teeth (TE) to actual number of teeth (T) is
  ক

  1/sin θ

  খ

  1/cos θ

  গ

  1/tan θ

  ঘ

  sin θ cos θ
• If b denotes the face width and L denotes the cone distance, then the bevel factor is written as
  ক

  b / L

  খ

  b / 2L

  গ

  1 – 2 b.L

  ঘ

  1 – b / L
• The root angle of a bevel gear is equal to
  ক

  pitch angle – addendum angle

  খ

  pitch angle + addendum angle

  গ

  pitch angle – dedendum angle

  ঘ

  pitch angle + dedendum angle
• The face angle of a bevel gear is equal to
  ক

  pitch angle – addendum angle

  খ

  pitch angle + addendum angle

  গ

  pitch angle – dedendum angle

  ঘ

  pitch angle + dedendum angle
• When bevel gears having equal teeth and equal pitch angles connect two shafts whose axes intersect at right angle, then they are known as
  ক

  angular bevel gears

  খ

  crown bevel gears

  গ

  internal bevel gears

  ঘ

  mitre gears
• If tangential force on worm is 1500N, then axial force on worm wheel will be?
  ক

  1500N

  খ

  3000N

  গ

  1500√2 N

  ঘ

  750N
• A pair of worm gear is written as 2/40/12/6. Calculate the root diameter of the worm wheel.
  ক

  186.22mm

  খ

  250.4mm

  গ

  225.6mm

  ঘ

  250.44mm
• A pair of worm gear is written as 2/40/12/6. Calculate the throat diameter of the worm wheel.
  ক

  220.5mm

  খ

  246.4mm

  গ

  190.44mm

  ঘ

  251.7mm
• A pair of worm gear is written as 2/40/12/6. Calculate the pitch circle diameter of worm wheel.
  ক

  72mm

  খ

  240mm

  গ

  260mm

  ঘ

  320mm
• A pair of worm gear is written as 2/40/12/6. Calculate the speed reduction.
  ক

  2

  খ

  20

  গ

  15

  ঘ

  6
• A pair of worm gear is written as 2/40/12/6. Calculate the centre distance.
  ক

  40mm

  খ

  156mm

  গ

  200mm

  ঘ

  80mm
• If worm helix angle is 30⁰, then worm should have at least ___ threads.
  ক

  5

  খ

  6

  গ

  7

  ঘ

  8