Engineering Materials Practice Set-1

31. Amorphous material is one

Which emits fumes on melting

In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid

In which atoms align themselves in a geometric pattern upon solidification

Which is not attacked by phosphorous

32. Body centered cubic space lattice is found in

Alpha iron, tungsten, chromium and molybdenum

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

None of the above

Gamma iron, aluminium, copper, lead, silver and nickel

33. Which of the following statement is wrong?

Steel with 0.8% carbon is wholly pearlite

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

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

The cementite is identified as round particles in the structure

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

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

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

None of the above

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

35. The charge of the blast furnace consists of

Calcined ore, coke and limestone all in equal parts

Calcined ore (1 part), coke (8 parts) and limestone (4 parts)

Calcined ore (4 parts), coke (1 part) and limestone (8 parts)

Calcined ore (8 parts), coke (4 parts) and limestone (1 part)

36. Cemented carbide tools are not found to be suitable for cutting

Cast iron

Brass

Steel

Aluminium

37. Dow metal contains

94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe

92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg

90% aluminium and 90% copper

90% magnesium and 9% aluminium with some copper

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

0.2%

0.8%

0.5%

1.0%

39. In process annealing, the hypo eutectoid steel is

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

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

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

Engineering Materials Practice Set-1

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