Engineering Materials Practice Set-1

31. Which of the following has a fine gold colour and is used for imitation jewellery?

Aluminium bronze

Babbitt metal

Gun metal

Silicon bronze

32. In spheroidising process, the steel is

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

None of the above

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

33. Which one of the following metals would work-harden more quickly than the others?

Silver

Copper

Lead

Brass

34. The composition of silver solder is

Silver, copper, aluminium

Silver, tin, nickel

Silver, lead, zinc

Silver, copper, zinc

35. Y-alloy contains

5 to 6% tin, 2 to 3% copper and rest aluminium

3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium

3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium

4 to 4.5% magnesium, 3 to 4% copper and rest aluminium

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

1.0%

0.2%

0.8%

0.5%

37. Nickel in steel

Improves wear resistance, cutting ability and toughness

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

Improves cutting ability and reduces hardenability

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

38. In process annealing, the hypo eutectoid steel is

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

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

39. 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 B.H.N. 400 and minimum tensile strength 15 MPa

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

None of the above

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

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

30° C to 50° C above upper critical temperature

Engineering Materials Practice Set-1

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