DIFFERENCE BETWEEN THE RADII OF THE BASE CIRCLE AND THE DEDENDUM CI...

4. Difference between the radii of the base circle and the dedendum circle.

Which of these statements are correct?

(a) 1, 2 and 3

(b) 2, 3 and 4

(c) 1, 3 and 4

(d) 1, 2 and 4

IES-2. Ans. (a)

IES-3.

The working surface above the pitch surface of the gear tooth is termed as

[IES-1998]

(a) Addendum (b) dedendum

(c) flank

(d) face

IES-3. Ans. (d)

o

14

2

IES-4.

Match the following

1

composite system gears

[IES-1992]

List

I

List

II

A.

Dedendum

1.

2

pd

B.

Clearance

2.

0.157

C. Working depth

3.

1.157

D.

Addendum

4.

1

Code: A B C D A B C D

(a)

1 2 3 4 (b)

4 3 2 1

(c) 3 2 1 4 (d)

3 1 2 4

Design of Power Transmission System

S K Mondal’s

Chapter 3

IES-4. Ans. (c)

IES-5. Match List I with List II and select the correct answer using the codes given

below the lists:

[IES-1993]

List I (Standard tooth/arms)

List II (Advantages or disadvantages)

A. 20° and 25° systems

1. Results in lower loads on bearing

B.

14.5

^o

stub-tooth system

2. Broadest at the base and strongest in

bending

C. 25° Full depth system

3. Obsolete

D. 20° Full depth system

4. Standards for new applications

(a)

4 3 2 1 (b)

3 1 2 4

(c) 3 2 1 4 (d)

4 2 3 1

IES-5. Ans. (a)

IES-6. Assertion

(A): When one body drives another by direct contact, their contact

points must have equal components of velocity normal to the surfaces at the point of

contact.

Reason

(R): Two points in the same body must have the same component of

velocity relative to the third body, in the direction of the line joining the two points.

[IES-1993]

(a) Both A and R are individually true and R is the correct explanation of A

(b) Both A and R are individually true but R is not the correct explanation of A

(c) A is true but R is false

(d) A is false but R is true

IES-6Ans. (a)

Classification of Gears

IES-7.

Match List I with List II and select the correct answer

[IES-1996]

List I

List II

A. Helical gears

1. Non-interchangeable

B. Herring bone gears

2. Zero axial thrust

C. Worm gears

3. Quiet motion

D. Hypoid Gears

4. Extreme speed reduction

Codes:

A

B

C

D

A

B

C

D

(a)

1

2

3

4

(b)

3

2

1

4

(c)

3

1

4

2

(d)

3

2

4

1

IES-7Ans. (d)

IES-8.

Match List-l (Type of Gears) with List-II (Characteristics) and select the

correct answer using the code given below the Lists:

[IES-2006]

List-I

List

-II

A. Helical gearing

1. Zero axial thrust

B. Herringbone gearing

2. Non-inter-changeable

C. Worm gearing

3. Skew shafts

D. Hypoid gearing

4. Parallel shafts

A

B

C

D

A

B

C

D

(a) 4

1

3

2

(b)

3

2

4

1

(c) 4

2

3

1

(d)

3

1

4

2

IES-8Ans. (a)

IES-9.

Match List I with List II and select the correct answer using the code given

below the Lists:

[IES 2007]

A. Worm gear

1. Imposes no thrust load on the shaft

B. Spur gear

2. To transmit power between two non-

intersecting

shafts which are perpendicular to

each

other

C. Herringbone gear

3. To transmit power when the shafts are

parallel

D. Spring level gear

4. To transmit power when the shafts are at

right

angles to one another

Code:

A B C D A B C D

(a) 1

2

3

4

(b)

2

3

1

4

(c) 1 2 4 3 (d)

2 3 4 1

IES-9Ans. (b)

IES-10. Match List I (Type of Gear/Gear Train) with List II (Different Usage and

Drive) and select the correct answer using the code given below the Lists:

List I

List II

[IES-2005]

A Epicyclic gear train

1. Reduces end thrust

B. Bevel Gear

2. Low gear ratio

C. Worm-worm Gear

3. Drives non-parallel nonintersecting shafts

D. Herringbone Gear

4. Drives non-parallel intersecting shafts