Engineering Materials Practice Set-1

11. In spheroidising process, the steel is

None of the above

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

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

Heated below the lower critical temperature and then cooled slowly

12. Bell metal contains

90% copper and 10% tin

85 - 92% copper and rest tin with little lead and nickel

70 - 75% copper and rest tin

70% copper and 30% zinc

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

Delta metal

Nichrome

Constantan

Monel metal

14. Y-alloy contains

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

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

4 to 4.5% magnesium, 3 to 4% 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

15. Iron-carbon alloys containing carbon ________ 4.3% are known as hyper-eutectic cast irons.

Less than

None of these

Equal to

More than

16. Body centered cubic space lattice is found in

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

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

None of the above

Alpha iron, tungsten, chromium and molybdenum

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

30° C to 50° C above upper critical temperature

30° C to 50° C above lower critical temperature

30° C to 50° C below upper critical temperature

30° C to 50° C below lower critical temperature

18. 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 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

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

Steel

Cast iron

Brass

Aluminium

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

None of the above

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

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

Engineering Materials Practice Set-1

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