Engineering Materials Practice Set-1

21. In process annealing, the hypo eutectoid steel is

Heated below or closes to the lower critical temperature and then cooled slowly

Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium

Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace

Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air

22. Pick up the wrong statement Nickel and chromium in steel help in

Providing corrosion resistance

Raising the elastic limit

Improving machining properties

Providing high strength at elevated temperatures

23. Which of the following statement is wrong?

The cementite is identified as round particles in the structure

Steel with 0.8% carbon is wholly pearlite

The amount of cementite increases with the increase in percentage of carbon in iron

A mechanical mixture of 87% cementite and 13% ferrite is called pearlite

24. Which of the following has highest specific strength of all structural materials?

Magnetic steel alloys

Magnesium alloys

Chromium alloys

Titanium alloys

25. Tensile strength of steel can be safely increased by

Adding carbon up to 0.83%

Adding carbon up to 2.8%

Adding small quantities of copper

Adding carbon up to 6.3%

26. A coarse grained steel

Is more ductile and has a less tendency to distort during heat treatment

Is less tough and has a greater tendency to distort during heat treatment

Is less tough and has a less tendency to distort during heat treatment

Is more ductile and has a greater tendency to distort during heat treatment

27. Normalising of steel is done to

Remove strains caused by cold working

All of the above

Remove dislocations caused in the internal structure due to hot working

Refine the grain structure

28. Which of the following alloys does not have copper as one of the constituents?

Constantan

Delta metal

Monel metal

Nichrome

29. According to Indian standard specifications, SG 400/15 means

Spheroidal graphite cast iron with minimum compressive strength 400 MPa and 15 percent reduction in area

Spheroidal graphite cast iron with minimum tensile strength 400 MPa and 15 percent elongation

None of the above

Spheroidal graphite cast iron with B.H.N. 400 and minimum tensile strength 15 MPa

30. The temperature required for full annealing in hypereutectoid steel is

30° C to 50° C above lower critical temperature

30° C to 50° C below lower critical temperature

30° C to 50° C below upper critical temperature

30° C to 50° C above upper critical temperature

Engineering Materials Practice Set-1

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