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Powder Metallurgy Quiz

Total questions: 23

Worksheet time: 26mins

Name
Class
Date
1.

A part produced by Powder metallurgy is termed as

a)

Welded part

b)

Cast part

c)

Forging part

d)

Sintered part

2.

Which method is used to make powder of metals having low melting point?

a)

Mechanical pulverisation

b)

Electrolytic process

c)

Chemical reduction

d)

Atomization

3.

The process carried out in powder metallurgy is as follows:

i. preparation of powder ii. grading of powder iii. compacting of powder iv. sintering.

The correct sequence is...

a)

i, ii, iii, iv

b)

i, iii, ii, iv

c)

ii, i, iii, iv

d)

iii, i, ii, iv

4.

The parts produced by Powder metallurgy

a)

always require machining

b)

are of higher dimensional accuracy

c)

can not be heat treated

d)

none of the above

5.

Which of the following tool is manufactured by powder metallurgy?

a)

High speed steel

b)

Sintered carbides

c)

High carbon steel

d)

Low carbon steel

6.

For powder of Aluminium and its alloys, the sintering temperature and time is

a)

370° – 500°C, upto 24 hrs

b)

250° – 350°C, upto 18 hrs

c)

400°-600°C, upto 20 hrs

d)

550oC-700oC, upto 22 hrs

7.

Sintering increases

a)

electrical conductivity, density and ductility

b)

electrical conductivity, density and brittleness

c)

porosity, electrical conductivity and brittleness

d)

porosity, density and ductility

8.

The sintering temperature is true for which of the following statements?

i. below the melting point of one of the component powder

ii. above the melting point of one of the component powder

iii. a compromise between strength and dimensional stability

Which the above is (are) true

a)

only i

b)

only ii

c)

ii & iii

d)

i, ii & iii

9.

The factors influencing shrinkage during sintering include

i. particle size                                    ii. Pressure used

iii. Sintering temperature                  iv. Pressing time

a)

i, ii & iii

b)

i, iii & iv

c)

i, ii, iii & iv

d)

i & iv

10.

Density in sintering product is improved by

i. hot pressing                  ii. Cold pressing             iii. Machining              iv. Coining

a)

i , ii & iv

b)

ii & 4

c)

i & iv

d)

i, ii, iii & iv

11.

The process of infiltration in sintered products is to improve

a)

porosity

b)

dimensional accuracy

c)

surface finish

d)

coherent property

12.

Which of the following products are made by powder metallurgy?

i. Babbit bearings        ii. Oil pump gears             iii. Tungsten wire            iv. Connecting rod

a)

i, ii & iii

b)

ii, iii & iv

c)

i, ii & iv

d)

i, ii, iii & iv

13.

The process producing a relatively coarse powder with a high percentage of oxide is

a)

atomizing

b)

gaseous reduction

c)

granulation

d)

carbonyl

14.

Porous product can be effectively produced using powder metallurgy.

a)

True

b)

False

15.

Dimensional accuracy in powder metallurgy is

a)

High

b)

Medium

c)

Low

d)

None of the mentioned

16.

Wastage of material in powder metallurgy as scrap is

a)

Large

b)

Small

c)

Depends on other factor

d)

None of the mentioned

17.

Complex shape can be formed effectively using

a)

Powder metallurgy

b)

Turning

c)

Sand casting

d)

Metal casting

18.

Range of particle size in powder to be used for powder metallurgy in microns should vary from

a)

4 to 200

b)

0.300 to 0.003

c)

100 to 2000

d)

5000 to 6000

19.

Process of forming metal powder by directing molten metal through an orifice after which it is break into small particle using high pressure fluid is known as

a)

Atomization

b)

Reduction

c)

Crushing

d)

Electrolysis

20.

Formation of metal powder to use in powder metallurgy by reducing some compound with CO or other molecules is known as

a)

Atomization

b)

Reduction

c)

Crushing

d)

Electrolysis

21.

Production of pure powder of iron and copper can be effectively done using

a)

Atomization

b)

Reduction

c)

Crushing

d)

Electrolysis

22.

Powder of various ferrous and non ferrous material which becomes brittle on heating, can be formed using

a)

Atomization

b)

Reduction

c)

Crushing

d)

Electrolysis

23.

Sintering is done to

a)

Decrease final strength

b)

Decrease strength

c)

Increase final strength

d)

None of the mentioned