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Tough Machine Design
Quiz 1
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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.
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.
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.
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.
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.
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.
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.
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.
a) 17⁰
b) 20⁰
c) 37⁰
d) 3⁰
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