Engineering Materials Practice Set-1

21. When steel containing less than 0.8% carbon is cooled slowly from temperatures above or within the critical range, it consists of

Ferrite and pearlite

Mainly pearlite

Mainly ferrite

Pearlite and cementite

22. In spheroidising process, the steel is

Heated below the lower critical temperature and then cooled slowly

Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C

Heated up to the lower critical temperature and then cooled in still air

None of the above

23. Nickel in steel

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

Improves wear resistance, cutting ability and toughness

Gives ductility, toughness, tensile strength and anti-corrosion properties

Improves cutting ability and reduces hardenability

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

Nichrome

Constantan

Delta metal

Monel metal

25. Heavy duty leaf and coil springs contain carbon of the following order

0.2%

0.8%

0.5%

1.0%

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

30° C to 50° C above upper 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 lower critical temperature

27. In a hardening process, the hypo-eutectoid steel is

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

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 suddenly in a suitable cooling medium

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

28. Pick up the wrong statement

Tungsten in steels improves magnetic properties and hardenability

Nickel and chromium in steel helps in raising the elastic limit and improve the resilience and ductility

Aluminium in steel results in excessive grain growth

Manganese in steel induces hardness

29. Which of the following statement is wrong?

The cementite is identified as round particles in the structure

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

Steel with 0.8% carbon is wholly pearlite

30. Brass (alloy of copper and zinc) is an example of

Substitutional solid solution

Interstitial solid solution

Intermetallic compounds

All of the above

Engineering Materials Practice Set-1

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