18) Which of the following is not an iron ore?

Answer is:

Carbon

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

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19) The carbon content in cast iron is in the range

Answer is:

2% to 4 %

20) Plain carbon steel has maximum strength at

Answer is:

0.8 % carbon

21) Quenching transforms Austenite to

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

Answer is:

Cutting heavy hot metal

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

For more MCQ's Click Here

18) Which of the following is not an iron ore?

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

19) The carbon content in cast iron is in the range

2% to 4 %

20) Plain carbon steel has maximum strength at

0.8 % carbon

21) Quenching transforms Austenite to

Martensite

22) In forging a har die is used for

Cutting heavy hot metal

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