MCQs on Terminology of Spur Gears
1 - Question
In cycloidal gears contact area is
a) Comparatively smaller
b) Comparatively larger
c) Can’t be determined
d) None of the listed
View Answer
Answer: b
Explanation: Convex flank on one tooth meets with concave on the other thus increasing the contact area.
2 - Question
Involute gears have greater contact area as compared to cycloidal gears.
a) True
b) False
View Answer
Answer: b
Explanation: There is mating of two convex surfaces and hence lesser contact area.
3 - Question
Cycloidal teeth consist of
a) Hypocycloid curve
b) Epicycloid gear
c) Both hypocycloid curve and epicycloid curve
d) None of the mentioned
View Answer
Answer: c
Explanation: It consist of both and thus are hard to manufacture.
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4 - Question
Pressure angle remains constant in case of involute profile.
a) True
b) False
View Answer
Answer: a
Explanation: The common normal always passes through the pitch point and thus maintain the constant inclination.
5 - Question
Pressure angle is _____ in case of cycloidal teeth.
a) Constant
b) Variable
c) zero
d) None of the listed
View Answer
Answer: b
Explanation: Cycloidal teeth consist of two profiles.
6 - Question
Velocity ratio is the ratio angular velocity of driving gear to that of driven gear.
a) True
b) False
View Answer
Answer: a
Explanation: Velocity ratio is simply the angular velocities ratio
7 - Question
Velocity ratio and transmission ratio are the same thing.
a) True
b) False
View Answer
Answer: b
Explanation: Transmission ratio is measured between first and last gear.
8 - Question
Contact ratio is always
a) =1
b) >1
c) <1
d) Can’t be determined
View Answer
Answer: b
Explanation: Some overlapping is essential for continuous transfer of power.
9 - Question
Product of diametric pitch and circular pitch is?
a) π
b) 1/π
c) None of the listed
d) 2
View Answer
Answer: a
Explanation: CP=πd/z and circular pitch=z/d.
10 - Question
Diameteral pitch is 5, then calculate module of the gear.
a) 0.2
b) 0.4
c) 5
d) 10
View Answer
Answer: a
Explanation: Module is the inverse of diameteral pitch.