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.

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

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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

25) In a conventional lathe tool post is mounted directly on the

Saddle

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

For more MCQ's Click Here

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

21) Quenching transforms Austenite to

Martensite

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

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

25) In a conventional lathe tool post is mounted directly on the

Saddle

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