20) Plain carbon steel has maximum strength at

0.8 % carbon

0.5 % carbon

1.1 % carbon

1.5 % carbon

Answer is:

0.8 % carbon

ISRO Technician-B Fitter Question Paper - 2017 (Set - 1) with Answer Key

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21) Quenching transforms Austenite to

Ferrite

Cementite

Martensite

Pearlite

Answer is:

Martensite

Explanation:

If the hot steel is cooled rapidly the austenite changes into a new structure called ‘MARTENSITE’. This structure is very fine grained, very hard and magnetic. It is extremely wear-resistant and can cut other metals.

22) In forging a har die is used for

Cutting heavy hot metal

Swaging hot metal

Bending hot metal

Upsetting hot metal

Answer is:

Cutting heavy hot metal

23) To true a job precisely in a 4 jaw chuck, the instrument used is a

Micrometer

Vernier bevel protractor

Dial test indicator with magnetic base

Try square

Answer is:

Dial test indicator with magnetic base

24) Which of the following is not used for turning a taper in a lathe?

Compound Slide method

Tail stock offset method

Form tool method

ISRO Technician-B Fitter Question Paper - 2017 (Set - 1) with Answer Key

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ISRO Technician-B Fitter Question Paper - 2017 (Set - 1) with Answer Key

20) Plain carbon steel has maximum strength at

0.8 % carbon

ISRO Technician-B Fitter Question Paper - 2017 (Set - 1) with Answer Key

Related ISRO Technician-B Fitter Question Paper - 2017 (Set - 1) with Answer Key

21) Quenching transforms Austenite to

Martensite

22) In forging a har die is used for

Cutting heavy hot metal

23) To true a job precisely in a 4 jaw chuck, the instrument used is a

Dial test indicator with magnetic base

24) Which of the following is not used for turning a taper in a lathe?

Top slide rotation method

ISRO Technician-B Fitter Question Paper - 2017 (Set - 1) with Answer Key