Q.1
Interference is caused by?
  • a) Overlapping of tooth profiles
  • b) Large size of dedendum
  • c) Meshing of involute and no-involute profiles
  • d) All of the mentioned
Q.2
Interference can be removed by under cutting.
  • a) True
  • b) False
Q.3
Interference is maximum when the largest pinion is in mesh with the smallest gear.
  • a) True
  • b) False
Q.4
Undercutting is consider healthy for the tooth as it eliminates undercutting.
  • a) True
  • b) False
Q.5
Backlash is defined as
  • a) Difference in the width of tooth space and engaging tooth thickness
  • b) Amount by which engaging tooth thickness exceeds the tooth space
  • c) Other name for interference
  • d) None of the listed
Q.6
The amount of backlash depends on
  • a) Diameteral pitch
  • b) Module
  • c) Centre distance
  • d) All of the mentioned
Q.7
The two teeth have thickness t₁ and t₂. If backlash of t₁ is greater than that of t₂, than
  • a) t₁ > t₂
  • b) t₁ < t₂
  • c) t₁ = t₂
  • d) None of the mentioned
Q.8
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.
Questionmachine-design-questions-answers8.jpg
  • a) 51N-m
  • b) 48N-m
  • c) 46N-m
  • d) 44N-m
Q.9
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.
Questionmachine-design-questions-answers9.jpg
  • a) 47N-m
  • b) 51N-m
  • c) 0
  • d) Infinity
Q.10
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 areand 30.
Questionmachine-design-questions-answers10.jpg
  • a) 66N-m
  • b) 68N-m
  • c) 53N-m
  • d) 45N-m
Q.11
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.
Questionmachine-design-questions-answers11.jpg
  • a) 510N
  • b) 526N
  • c) 544N
  • d) None of the listed
Q.12
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 byandrespectively. Module is taken as 5mm. Calculate the length of the arm C.
Questionmachine-design-questions-answers12.jpg
  • a) Missing data
  • b) 250mm
  • c) 330mm
  • d) 240mm
Q.13
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 byandrespectively. Module is taken as 5mm. Calculate the tangential component of gear tooth force.
Questionmachine-design-questions-answers13.jpg
  • a) 220.6N
  • b) 303.2N
  • c) 454.7N
  • d) 633.2N
Q.14
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 byandrespectively. Module is taken as 5mm. A pair of spur gears consist ofteeth pinion meshing with ateeth gear. The module is 5mm. Calculate the gear ratio.
Questionmachine-design-questions-answers14.jpg
  • a) 5
  • b) 4.6
  • c) 5.2
  • d) 4
Q.15
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 byandrespectively. Module is taken as 5mm. Calculate the shaft angle for opposite hand of helix if helix angle of two gears areand 17⁰.
Questionmachine-design-questions-answers15.jpg
  • a) 17⁰
  • b) 20⁰
  • c) 37⁰
  • d) 3⁰
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