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ISRO Draughtsman-B
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ISRO Draughtsman-B Mechanical 2016
39

ISRO Draughtsman-B Mechanical Question Paper - 2016 (Set -1) with Answer Key

39) If hot steel is cooled rapidly, the austenite changes into

Ferrite

Pearlinte

Martensite

Hyper eutectoid

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 Draughtsman-B Mechanical Question Paper - 2016 (Set -1) with Answer Key

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40) Tempering in steel is done to

increase toughness

refine grain size

to improve machinability

increase wear resistance

Answer is:

increase toughness

41) In an open belt drive, the tight and slack side of the belt loads are 2000 N and 1000 N respectively. The belt speed is 120 m/min. The power in Watts transmitted by the system is

1000

2000

3000

2.66

Answer is:

2000

42) A Cube of side 10 cm has a square through hold of 5 cm size at its centre. What is the mass of the cube if the density of the material is 5 gm/cc? g=10 m/square second.

375 gm

100000 gm

3750 gm

37500 gm

Answer is:

3750 gm

43) Which of the following belt is used for low power transmission?

Flat belt

Round belt

Vee belt

Multi grooved belt

Answer is:

Round belt

ISRO Draughtsman-B Mechanical Question Paper - 2016 (Set -1) with Answer Key

For more MCQ's Click Here

39) If hot steel is cooled rapidly, the austenite changes into

Martensite

ISRO Draughtsman-B Mechanical Question Paper - 2016 (Set -1) with Answer Key

Related ISRO Draughtsman-B Mechanical Question Paper - 2016 (Set -1) with Answer Key

40) Tempering in steel is done to

increase toughness

41) In an open belt drive, the tight and slack side of the belt loads are 2000 N and 1000 N respectively. The belt speed is 120 m/min. The power in Watts transmitted by the system is

2000

42) A Cube of side 10 cm has a square through hold of 5 cm size at its centre. What is the mass of the cube if the density of the material is 5 gm/cc? g=10 m/square second.

3750 gm

43) Which of the following belt is used for low power transmission?

Round belt

ISRO Draughtsman-B Mechanical Question Paper - 2016 (Set -1) with Answer Key