Machine Kinematics

Systems of Gear Teeth

Question 1
Marks : +2 | -2
Pass Ratio : 100%
The dedendum circle diameter is equal to
pitch circle dia. x cosɸ
addendum circle dia. x cosɸ
clearance circle dia. x cosɸ
pitch circle dia. x sinɸ
Explanation:
It is the circle drawn through the bottom of the teeth. It is also called root circle.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
The ratio of the number of teeth to the pitch circle diameter in millimeters, is called
circular pitch
diametral pitch
module
none of the mentioned
Explanation:
Diametral pitch is the ratio of number of teeth to the pitch circle diameter in millimetres.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
The ratio of the pitch circle diameter in millimeters to the number of teeth, is called circular pitch.
True
False
Explanation:
Diametral pitch is the ratio of number of teeth to the pitch circle diameter in millimetres.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
The product of the diametral pitch and circular pitch is equal to
1
1/п
п
2п
Explanation:
None.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
The module is the reciprocal of diametral pitch.
True
False
Explanation:
Diametral pitch is the ratio of number of teeth to the pitch circle diameter in millimetres.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
The face of the tooth is the
surface of the top of tooth
surface of tooth above the pitch surface
width of tooth below the pitch surface
width of tooth measured along the pitch circle
Explanation:
Face of tooth is the surface of the gear tooth above the pitch surface.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
The contact ratio is the ratio of
length of pair of contact to the circular pitch
length of arc of contact to the circular pitch
length of arc of approach to the circular pitch
length of arc of recess to the circular pitch
Explanation:
The ratio of the length of arc of contact to the circular pitch is known as contact ratio i.e. number of pairs of teeth in contact.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
The product of the diametral pitch and module is equal to one.
True
False
Explanation:
None.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
According to law of gearing, the common normal at the point of contact between a pair of teeth must always pass through the pitch point.
True
False
Explanation:
None.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
The flank of the tooth is the surface of the tooth _____________ the pitch surface.
above
below
on
none of the mentioned
Explanation:
Face of tooth is the surface of the gear tooth above the pitch surface.