# Machine Kinematics Questions and Answers – Law of Gearing-1

This set of Machine Kinematics Multiple Choice Questions & Answers (MCQs) focuses on “Law of Gearing – 1”.

1. The two parallel and coplaner shafts are connected by gears having teeth parallel to the axis of the shaft. This arrangement is known as
a) spur gearing
b) helical gearing
c) bevel gearing
d) spiral gearing

Explanation: The two parallel and co-planar shafts connected by the gears. These gears are called spur gears and the arrangement is known as spur gearing.

2. The arrangement is called bevel gearing, when two __________ are connected by gears.
a) tension in the tight side of the belt
b) tension in the slack side of the belt
c) sum of the tensions on the tight side and slack side of the belt
d) average tension of the tight side and slack side of the belt

Explanation: The two non-parallel or intersecting, but coplanar shafts connected by gears. These gears are called bevel gears and the arrangement is known as bevel gearing.

3. When two non-intersecting and non-coplaner shafts are connected by gears,the arrangement is known as helical gearing.
a) True
b) False

Explanation: The two parallel and co-planar shafts connected by the gears. These gears are called spur gears and the arrangement is known as spur gearing. These gears have teeth parallel to the axis of the wheel. Another name given to the spur gearing is helical gearing.

4. The gears are termed as medium velocity gears, if their peripheral velocity is
a) 1-3 m/s
b) 3-15 m/s
c) 15-30 m/s
d) 30-50 m/s

Explanation: The gears having velocity less than 3 m/s are termed as low velocity gears and gears having velocity between 3 and 15 m/s are known as medium velocity gears.

5. An imaginary circle which by pure rolling action, gives the same motion as the actual gear, is called
b) dedendum circle
c) pitch circle
d) clearance circle

Explanation: Addendum circle is the circle drawn through the top of the teeth and is concentric with the pitch circle.
Dedendum circle is the circle drawn through the bottom of the teeth. It is also called root circle.
Pitch circle is an imaginary circle which by pure rolling action, would give the same motion as the actual gear.
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6. The size of a gear is usually specified by
a) pressure angle
b) circular pitch
c) diametral pitch
d) pitch circle diameter

Explanation: Pitch circle diameter is the diameter of the pitch circle. The size of the gear is usually specified by the pitch circle diameter. It is also known as pitch diameter.

7. The radial distance of a tooth from the pitch circle to the bottom of the tooth is called
a) dedendum
c) clearance
d) working depth

Explanation: Dedendum is the radial distance of a tooth from the pitch circle to the bottom of the tooth.
Addendum is the radial distance of a tooth from the pitch circle to the top of the tooth.

8. The addendum is the radial distance of tooth from the pitch circle to the top of the tooth.
a) True
b) False

Explanation: Dedendum is the radial distance of a tooth from the pitch circle to the bottom of the tooth.
Addendum is the radial distance of a tooth from the pitch circle to the top of the tooth.

9. The working depth of a gear is radical distance from the
a) pitch circle to the bottom of a tooth
b) pitch circle to the top of a tooth
c) top of a tooth to the bottom of a tooth
d) addendum circle to the clearance circle

Explanation: Working depth is the radial distance from the addendum circle to the clearance circle. It is equal to the sum of the addendum of the two meshing gears.

10. The radial distance from the top of a tooth to the bottom of a tooth in a meshing gear, is called
a) dedendum
c) clearance
d) working depth

Explanation: Clearance is the radial distance from the top of the tooth to the bottom of the tooth, in a meshing gear. A circle passing through the top of the meshing gear is known as clearance circle.

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