Machine Kinematics Questions and Answers – Law of Gearing – 2

This set of Machine Kinematics Questions and Answers for Campus interviews focuses on ” Law of Gearing – 2″.

1. A side and face cutter 125 mm diameter has 10 teeth. It operates at a cutting speed of 14 m/min with a table traverse 100 mm/min. The feed per tooth of the cutter is
a) 10 mm
b) 2.86 mm
c) 0.286 mm
d) 0.8 mm
View Answer

Answer: c
Explanation: пDN = 14,
N = 14000/3.14 x 125 = 35.65
Feed for tooth = table traverse/ N x no. of teeth = 100/35.65 x 10 = 0.286 mm.

2. Consider the following statements in case of reverted gear train:
1. The direction of rotation of the first and the last gear is the same.
2. the direction of rotation of the first and the last gear is opposite.
3. The first and the last gears are on the same shaft.
4. The first and the last gears are on separate but co-axial shafts.
Which of these statements is/are correct?
a) 1 and 3
b) 2 and 3
c) 2 and 4
d) 4 alone
View Answer

Answer: d
Explanation: Only fourth statement is correct.

3. The dynamic load on a gear is due to
1. inaccurancies of tooth spacing
2. irregularities in tooth profile
3. deflection of the teeth under load
4. type of service
Which of the above statements are correct?
a) 1,2 and 3
b) 2,3 and 4
c) 1,3 and 4
d) 1,2 and 4
View Answer

Answer: a
Explanation: The dynamic load on a gear is due to
1. inaccurancies of tooth spacing
2. irregularities in tooth profile
3. deflection of the teeth under load.
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4. Consider the following statements:
A 200 stub tooth system is generally preferred in spur gears as it results in
1. stronger teeth
2. lesser number of teeth on the pinion
3. lesser chances of surface fatigue failure
4. reduction of interference
Which of the above statements are correct?
a) 1,2 and 4
b) 3 and 4
c) 1 and 3
d) 1,2,3 and 4
View Answer

Answer: a
Explanation: A 200 stub tooth system is generally preferred in spur gears as it results in
1. stronger teeth
2. lesser number of teeth on the pinion
3. reduction of interference.

5. An involute rack with 200 pressure angle meshes with a pinion of 14.50 pressure angle.
a) True
b) False
View Answer

Answer: b
Explanation: Such a matching is impossible.

6. When a pair of spur gears of the same material is in mesh, the design is based on pinion.
a) True
b) False
View Answer

Answer: a
Explanation: For a pair of gears of the same material in mesh, the strength factor of the pinion is less than that of the gear.

7. Consider the following modifications regarding avoiding the interference between gears:
1. The centre distance between meshing gears be increased
2. Addendum of the gear be modified
3. Teeth should be undercut slightly at the root
4. Pressure angle should be increased
5. Circular pitch be increased
Which of these are effective in avoiding interference?
a) 1,2 and 3
b) 2,3,4 and 5
c) 1,4 and 5
d) 3,4 and 5
View Answer

Answer: a
Explanation: None.
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8. In a reverted gear train, two gears P and Q are meshing, Q-R is a compound gear, and R and S are meshing. The modules of P and R are 4 mm and 5 mm respectively. The numbers of teeth in P, Q and r are 20, 40 and 25 respectively. The number of teeth in S is
a) 23
b) 35
c) 50
d) 53
View Answer

Answer: a
Explanation: C = 1/2m1(zp + zq) = 1/2m2(zr + zs)
4(20 + 40) = 5(25 + zs)
zs = 23.

9. When two spur gears having involute profiles on their teeth engage, the line of action is tangential to the
a) pitch circles
b) dedendum circles
c) addendum circles
d) base circles
View Answer

Answer: a
Explanation: None.
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10. If the annular wheel of an epicyclic gear train has 100 teeth and the planet wheel has 20 teeth, the number of teeth on sun wheel is
a) 80
b) 60
c) 40
d) 20
View Answer

Answer: b
Explanation: 2dp + ds = da
2zp + zs = za
2 x 20 + zs = 100
zs = 60.

Sanfoundry Global Education & Learning Series – Machine Kinematics.
To practice all areas of Machine Kinematics for Campus Interviews, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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