Engineering Materials Practice Set-1

1. 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

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

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

2. For a steel containing 0.8% carbon

There are two critical points

There is only one critical point

There is no critical point

There can be any number of critical points

3. Amorphous material is one

Which is not attacked by phosphorous

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

Which emits fumes on melting

In which atoms align themselves in a geometric pattern upon solidification

4. In a hardening process, 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 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 slowly in the furnace

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

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

Delta metal

Constantan

Monel metal

Nichrome

6. Dow metal contains

90% aluminium and 90% copper

90% magnesium and 9% aluminium with some copper

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

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

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

Babbitt metal

Gun metal

Aluminium bronze

Silicon bronze

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

None of the above

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

9. The charge of the blast furnace consists of

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

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

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

Calcined ore, coke and limestone all in equal parts

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

More than

Less than

Equal to

None of these

Engineering Materials Practice Set-1

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