Machine Kinematics

Bevel Gears-1

Question 1
Marks : +2 | -2
Pass Ratio : 7%
Pitch cone angle of pinion of straight tooth bevel gear pair with ratio 1.732 is
250
300
600
none of the mentioned
Explanation:
None.
Question 2
Marks : +2 | -2
Pass Ratio : 6%
The face width of the bevel gear is 0.3 times the radius of pitch cone. Here the bevel factor must be
1.3
3
0.7
1.7
Explanation:
Face width = Pitch cone radius/3
Question 3
Marks : +2 | -2
Pass Ratio : 7%
Bevel gears with shafts angle of 900 are termed as
zerol gears
angular bevel gears
mitre gears
hypoid gears
Explanation:
The bevel gears with shaft angle 900 are termed as Mitre gears. The bevel gears with any other shaft angle are termed as angular bevel gears.
Question 4
Marks : +2 | -2
Pass Ratio : 1%
Face width of the bevel gear is usually equal to
10 modules
pitch cone radius/3
pitch cone radius/2
none of the mentioned
Explanation:
For correctly designed gears the face width should not be more than 1/3 the slant length, i.e. pitch cone radius.
Question 5
Marks : +2 | -2
Pass Ratio : 1%
Formative number of teeth on bevel gears is equal to
2 x actual number of teeth
actual number of teeth/ cosɸ
actual number of teeth/cosα
actual number of teeth/cosÏ´
Explanation:
None.
Question 6
Marks : +2 | -2
Pass Ratio : 12%
Lewis Equation for bevel gear is corrected for
variation in p.c.d.
variation in tooth thickness
taking care of axial thrust
variation in torque acting on the tooth
Explanation:
As radius of bevel gear varies along the width, the torque does not produce the same tangential force.
Question 7
Marks : +2 | -2
Pass Ratio : 3%
The bevel gears are used to connect
two parallel shafts
two intersecting shafts
two non intersecting shafts
none of the mentioned
Explanation:
Two intersecting shafts are connected by bevel gears and pitch cylinders in spur gears.
Question 8
Marks : +2 | -2
Pass Ratio : 22%
Bevel factor should not be less than
0.75
0.8
0.67
0.76
Explanation:
None.
Question 9
Marks : +2 | -2
Pass Ratio : 6%
Ratio factor Q in wear load equation of bevel gear is given by
2gear ratio G/G + 1
2ratio of formative number of teeth of gear and pinion G
G + 1/G‘ +1
2G‘/G
Explanation:
None.
Question 10
Marks : +2 | -2
Pass Ratio : 6%
The bevel gears used for connecting non intersecting shafts are
mitre gears
hypoid gears
spiral bevel gears
zerol gears
Explanation:
The bevel gears used for connecting non intersecting shafts are hypoid gears. The bevel gears with shaft angle 900 are termed as Mitre gears.