Engineering Questions with Answers - Multiple Choice Questions
Machine Kinematics MCQ – Law of Gearing-1
1 - Question
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
View Answer
Answer: a
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 - Question
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
View Answer
Answer: a
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 - Question
When two non-intersecting and non-coplaner shafts are connected by gears,the arrangement is known as helical gearing.
a) True
b) False
View Answer
Answer: b
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 - Question
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
View Answer
Answer: b
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 - Question
An imaginary circle which by pure rolling action, gives the same motion as the actual gear, is called
a) addendum circle
b) dedendum circle
c) pitch circle
d) clearance circle
View Answer
Answer: c
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.
6 - Question
The size of a gear is usually specified by
a) pressure angle
b) circular pitch
c) diametral pitch
d) pitch circle diameter
View Answer
Answer: d
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 - Question
The radial distance of a tooth from the pitch circle to the bottom of the tooth is called
a) dedendum
b) addendum
c) clearance
d) working depth
View Answer
Answer: a
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 - Question
The addendum is the radial distance of tooth from the pitch circle to the top of the tooth.
a) True
b) False
View Answer
Answer: a
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 - Question
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
View Answer
Answer: d
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 - Question
The radial distance from the top of a tooth to the bottom of a tooth in a meshing gear, is called
a) dedendum
b) addendum
c) clearance
d) working depth
View Answer
Answer: c
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.