MCQs on Bevel Gears
1 - Question
There are ____ common types of bevel gears.
a) 1
b) 2
c) 3
d) 4
View Answer
Answer: b
Explanation: Spiral and straight.
2 - Question
Straight bevel gears are easy to design and manufacture and give reasonably good service with quieter operation.
a) True
b) No, noise problem
c) No, vibration problem
d) None of the listed
View Answer
Answer: b
Explanation: They produce a lot of noise while working.
3 - Question
Which of the following creates smoother motion?
a) Straight bevel gears
b) Spiral bevel gears
c) Equal for straight and spiral
d) None of the mentioned
View Answer
Answer: b
Explanation: Spiral bevel gear has smooth engagement which results in quieter operation.
4 - Question
When the pitch angle is greater than 90⁰, it is called external bevel gear.
a) True
b) Internal
c) Helical
d) Herringbone
View Answer
Answer: b
Explanation: For external bevel gear, pitch angle is less than 90⁰.
5 - Question
For crown bevel gear, pitch angle is
a) <90 b) =90 c) >90
d) None of the listed
View Answer
Answer: b
Explanation: Crown gears are characterised by pitch angle of 90⁰.
6 - Question
If pitch angle is >90, the bevel gear is?
a) Internal
b) External
c) Crown
d) Static
View Answer
Answer: a
Explanation: Nomenclature.
7 - Question
Miter gears are the bevel gears mounted on shaft which are intersecting at angle greater than 90.
a) True
b) False
View Answer
Answer: b
Explanation: The shafts which are intersecting at 90.
8 - Question
Crown gears having a pitch angle of 90⁰ are mounted on shafts intersecting at an angle
a) =90
b) <90 c) >90
d) None of the listed
View Answer
Answer: c
Explanation: Application of crown gear according to its structure.
9 - Question
Which of the following are characteristics of skew bevel gears?
a) Straight teeth
b) Mounted on parallel shafts
c) Mounted on intersecting shafts
d) All of the mentioned
View Answer
Answer: a
Explanation: They are used in non-parallel and non-intersecting shafts.
10 - Question
Hypoid gears are based on surfaces that are paraboloids of revolution.
a) True
b) False
View Answer
Answer: b
Explanation: They are hyperboloids of revolution.
11 - Question
When two hyperboloids are rotated, the resulting motion is
a) Sliding
b) Turning
c) Combination of turning and sliding
d) Rotary
View Answer
Answer: c
Explanation: There is turning as well as sliding motion.
12 - Question
In hypoid bevel gears, shafts may continue past each other.
a) True
b) False
View Answer
Answer: a
Explanation: Offset of the shaft is quite considerable in case of hypoid gears.
13 - Question
Hypoid gears have the following characteristics.
a) Curved teeth
b) Mounted on non -parallel non intersecting shafts
c) Efficiency of 97%
d) All of the mentioned
View Answer
Answer: d
Explanation: It has curved teeth and are mounted on non-parallel non intersecting shafts with efficiency of 96-98%.
14 - Question
Zerol gears are straight bevel gears with zero spiral angle.
a) True
b) False
View Answer
Answer: b
Explanation: They happen to fall in the category of spiral bevel gears.
15 - Question
Zerol gears give lesser contact ratio.
a) True
b) No, larger contact ratio
c) Zero contact
d) None of the listed
View Answer
Answer: b
Explanation: Zerol gears have more gradual contact and slighter larger contact ratio.