HIGH GEAR RATIO A B C D A B C D (A) 5 4 3 1 (B) 2 3 4 5 (C) 5 3 4 1...

5.

High

gear

ratio

A B C D A B

C

D

(a) 5

4

3

1

(b)

2

3

4

5

(c) 5

3

4

1

(d)

2

4

3

5

IES-10Ans. (a)

IES-11. Which type of gear is used for shaft axes having an offset? [IES-2004]

(a) Mitre gears

(b) Spiral bevel gears

(c) Hypoid gears

(d) Zerol gears

IES-11.Ans. (c)

IES-12. The gears employed for connecting two non-intersecting and non-parallel,

i.e., non-coplanar shafts are

[IES-2003; 2005]

(a) Bevel gears (b) Spiral gears

(c) Helical gears

(d) Mitre gears

IES-12.Ans. (b)

IES-13. When two shafts are neither parallel nor intersecting, power can be

transmitted by using

[IES-1998]

(a) A pair of spur gears

(b) a pair of helical gears

(c) An Oldham's coupling

(d) a pair of spiral gears

IES-13Ans. (d)

IES-14. In a single reduction, a large velocity ratio is required. The best

transmission is

[IES-1999]

(a) Spur gear drive

(b) helical gear drive

(c) Bevel gear drive

(d) worm gear drive

IES-14Ans. (a)

IES-15. Which one of the following pairs is not correctly matched? [IES-1995]

(a) Positive drive .... Belt drive

(b) High velocity ratio .... Worm gearing

(c) To connect non-parallel and non- intersecting shafts .... Spiral gearing.

Design of Power Transmission System

S K Mondal’s

Chapter 3

(d) Diminished noise and smooth operation .... Helical gears.

IES-15Ans. (a)

Mitres gear

IES-16. Mitre gears

[IES-1992]

(a) spur-gears with gear ratio 1: 1

(b) Skew gears connecting non-parallel and nonintersecting shafts

(c) Bevel gears transmitting power at more than or less than 90°

(d) Bevel gears in which the angle between the axes is 90° and the speed ratio of

the gears is 1: 1

IES-16Ans. (d)

IES-17. Match List-I (Gears) with List-II (Configurations) and select the correct

answer using the codes given below the Lists:

[IES-2003]

List-I

List-II

(Gears)

(Configurations)

A Spur

1. Connecting two non-parallel or intersecting but coplanar

shafts

B. Bevel

2. Connecting two parallel and coplanar shafts with teeth

parallel to the axis of the gear wheel

C. Helical

3. Connecting two parallel and coplanar shafts with teeth

inclined to the axis of the gear wheel

D. Mitre

4. Connecting two shafts whose axes are mutually

perpendicular

to

each

other

Codes:

A

B

C

D

A

B

C

D

(a)

2

4

3

1

(b)

3

1

2

4

(c)

2

1

3

4

(d)

3

4

2

1

IES-17Ans. (c)

Pitch point

IES-18. Gearing contact is which one of the following?

[IES 2007]

(a) Sliding contact

(b) Sliding contact, only rolling at pitch point

(c) Rolling contact

(d) Rolling and sliding at each point of

contact

IES-18Ans. (b)

When pair of teeth touch at the pitch point ,they have for the instant pure rolling

action. At any other position they have the slidingaction.

IES-19. When two spur gears having involute profiles on, their teeth engage, the

line of action is tangential to the

[IES-2003]

(a) Pitch circles

(b) Dedendum circles

(c) Addendum circles

(d) Base circles

IES-19Ans. (d)

Pressure angle

IES-20. What is the value of pressure angle generally used for involute gears?

[IES-2006]

(a) 35°

(b) 30°

(c) 25 °

(d) 20°

IES-20Ans. (d)

IES-21. Consider the following, modifications regarding avoiding the interference

between gears:

[IES-2003]