Mechanical Engineering - Engineering Materials

21. 

Dye penetrant method is generally used to locate

A. core defects
B. surface defects
C. superficial defects
D. temporary defects

Answer: Option B

Explanation:

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22. 

The charge is fed into the blast furnace through the

A. stack
B. throat
C. bosh
D. tuyers

Answer: Option B

Explanation:

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23. 

A small percentage of boron is added to steel in order to

A. increase hardenability
B. reduce machinability
C. increase wear resistance
D. increase endurance strength

Answer: Option A

Explanation:

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24. 

Which of the following process of steel making is in operation at Tata Iron and Steel Works, Jamshedpur?

A. Bessemer process
B. Open hearth process
C. Duplex process
D. Electric process

Answer: Option C

Explanation:

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25. 

The unit cells

A. contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal
B. have the same orientation and their similar faces are parallel
C. may be defined as the smallest parallelopiped which could be transposed in three coordinate directions to build up the space lattice
D. all of the above

Answer: Option D

Explanation:

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