91(IN MPA)15 10×60 6 10 (IN MPA)6−× ×OCOS45THREADED FASTENERS GATE-...

58. - GATE PAPERS MACHINE DESIGN IES GATE IAS 20 YEARS QUESTION AND ANSWERS PDF 58. - GATE PAPERS MACHINE DESIGN IES GATE IAS 20 YEARS QUESTION AND ANSWERS PDF
GATE PAPERS MACHINE DESIGN IES GATE IAS 20 YEARS QUESTION AND ANSWERS PDF

58.91(in MPa)

15 10

×

60

6

10 (in MPa)

6

−

×

×

o

cos45

Threaded fasteners

GATE-4. A threaded nut of M16, ISO metric type, having 2 mm pitch with a pitch

diameter of 14.701 mm is to be checked for its pitch diameter using two or

three numbers of balls or rollers of the following sizes [GATE-2003]

(a) Rollers of 2 mm

φ

(b) Rollers of 1.155 mm

φ

(c) Balls of 2 mm

φ

(d) Balls of 1.155 mm

φ

GATE-4. Ans. (b)

Previous 20-Years IES Questions

Cotters

IES-1.

Assertion (A): A cotter joint is used to rigidly connect two coaxial rods carrying

tensile load.

Reason (R): Taper in the cotter is provided to facilitate its removal when it fails

due to shear.

[IES-2008]

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

(b) Both A and R are 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-1. Ans. (b) A cotter is a flat wedge shaped piece of rectangular cross-section and its

width is tapered (either on one side or both sides) from one end to another for an

easy adjustment. The taper varies from 1 in 48 to 1 in 24 and it may be increased up

to 1 in 8, if a locking device is provided. The locking device may be a taper pin or a

set screw used on the lower end of the cotter. The cotter is usually made of mild

steel or wrought iron. A cotter joint is a temporary fastening and is used to connect

rigidly two co-axial rods or bars which are subjected to axial tensile or compressive

forces.

IES-2.

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

below the Lists:

[IES 2007]

List

I

List

II

(Application)

(Joint)

A. Boiler shell

1. Cotter joint

B. Marine shaft coupling

2. Knuckle joint

C. Crosshead and piston road

3. Riveted joint

D. Automobile gear box

4. Splines

(gears to shaft)

5. Bolted Joint

Code: A B C D

A B C D

(a)

1 4 2 5 (b)

3 5 1 4

(c) 1 5 2 4 (d)

3 4 1 5

IES-2. Ans. (b)

IES-3.

Match List-I (Parts to be joined) with List-II (Type of Joint) and select the

correct answer using the code given below:

[IES-2006]

List-I

List -II

nt

sign o

of Join

Des

S K M

Monda

al’s

er 1

Chapte

n

1.

ds having

xial motion

A. Two ro

relative ax

Pin Joint

oint

g rod