Engineering Materials Practice Set-2

11. Monel metal contains

63 to 67% nickel and 30% copper

Malleable iron and zinc

88% copper and 10% tin and rest zinc

Alloy of tin, lead and cadmium

12. Addition of manganese to aluminium results in

Improvement of casting characteristics

Improvement of corrosion resistance

Improving machinability

One of the best known age and precipitation hardening systems

13. When low carbon steel is heated up to upper critical temperature

The average grain size is a minimum

The grain size first increases and then decreases very rapidly

The grain size increases very rapidly

There is no change in grain size

14. White cast iron

Is produced by annealing process. It is soft, tough and easily machined metal

Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron

15. Aluminium bronze contains

10% aluminium and 90% copper

90% magnesium and 9% aluminium with some copper

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

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

16. Which of the following alloys does not contain tin?

Fusible metal

Phosphor bronze

Solder admiralty

White metal

17. Duralumin 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

18. Malleable cast iron

Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron

Is produced by annealing process. It is soft, tough, and easily machined metal

Is produced by small additions of magnesium (or cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material

19. The correct sequence for descending order of machinability is

Grey cast iron, low carbon steel, wrought iron

Wrought iron, low carbon steel, grey cast iron

Low carbon steel, grey cast iron, wrought iron

Wrought iron, grey cast iron, low carbon steel

20. The percentage of carbon in pig iron varies from

4 to 4.5%

2.5 to 4%

0.1 to 1.2%

1.5 to 2.5%

Engineering Materials Practice Set-2

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