Material Science MCQ 10

1. The temperature required for full annealing in hyper-eutectoid steel is

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

30° C to 50° C above upper critical temperature

2. Which of the following metal shrinks most from molten state to solid state?

Cast steel

Admirality metal

Cast iron

Brass

3. A steel containing ferrite and pearlite is

hard and tough

tough

soft

hard

4. The defect which takes place due to imperfect packing of atoms during crystallisation is known as

none of these

line defect

point defect

surface defect

5. A coarse grained steel

is less tough and has a less tendency to distort during heat treatment

is less tough and has a greater tendency to distort during heat treatment

is more ductile and has a less tendency to distort during heat treatment

is more ductile and has a greater tendency to distort during heat treatment

6. Duralumin contains

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% managanese, 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

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

7. Age hardening is related to

copper

silver

brass

duralumin

8. The addition of which of the following improves machining of copper?

Sulphur

Zinc

Vanadium

Tin

9. _____________is added in low carbon steels to raise its yield point.

Phosphorus

Sulphur

Copper

Tin

10. In process annealing, the hypo-eutectoid steel is

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 in still air

heated below or close to the lower critical temperature and then cooled slowly

heated from 30° C to 50° C above the upper critical temperature and then cooled slowly in the furnace

11. Delta-iron occurs between the temperature range of

600°C to 900°C

1400°C to 1530°C

900°C to 1400°C

400°C to 600°C

12. White cast iron has

all of these

carbon in the form of carbide

high compressive strength

low tensile strength

13. The stiffness is the ability of a material to resist deformation under stress.
Click for explanation

True

False

14. In low carbon steels, presence of small quantities of sulphur improves

formability

machinability

hardenability

weldability

15. The aluminium alloy made by melting aluminium with 2 to 10% magnesium and 1.75% copper is called

duralumin

Y-alloy

hindalium

magnalium

16. 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

17. The main alloying elements high speed steel in order of increasing proportion are

tungsten, titanium, vanadium

chromium, titanium, vanadium

vanadium, chromium, tungsten

tungsten, chromium, titanium

18. Which of the following metal is used in making electrical resistance wire for electric furnaces and heating elements?

Monel metal

Babbit metal

Phosphor bronze

Nichrome

19. Which of the following when used in ordinary low carbon steels, makes the metal ductile and of good bending qualities?

Silicon

Phosphorus

Manganese

Sulphur

20. Cartidge brass can be

any one of these

drawn into wires

formed into tube

cold rolled into sheets

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Material Science MCQ 10

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