Materials and Construction

Question: Nickel and molybdenum are the basic constituents of
[A].

hastealloy

[B].

German silver

[C].

inconel

[D].

solder

Answer: Option A

Explanation:

No answer description available for this question.

Question: Nickel and copper are the basic constituents of
[A].

hastelloy

[B].

monel metal

[C].

German silver

[D].

inconel

Answer: Option B

Explanation:

No answer description available for this question.

Question: A chemical change takes place when iron
[A].

rusts

[B].

melts

[C].

is heated

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Corrosion resisting properties of cast iron are significantly improved by the addition of 12 – 15% of
[A].

tungsten

[B].

vanadium

[C].

silicon

[D].

all (a), (b) & (c)

Answer: Option C

Explanation:

No answer description available for this question.

Question: Cementite is
[A].

Fe3C chemically.

[B].

a compound of carbon and iron.

[C].

characterised by an orthorhombic crystal structure.

[D].

all (a), (b) and (c).

Answer: Option D

Explanation:

No answer description available for this question.

Question: Alpha iron is stable __________ °C.
[A].

above 1403

[B].

upto 910

[C].

above 1800

[D].

between 910 & 1403

Answer: Option B

Explanation:

No answer description available for this question.

Question: Galvanised iron is
[A].

harder

[B].

protected from rusting

[C].

alumina coated iron

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: White cast iron as compared to grey cast iron is
[A].

more durable

[B].

very brittle

[C].

very hard

[D].

all (a), (b) & (c)

Answer: Option D

Explanation:

No answer description available for this question.

Question: Atmospheric corrosion of metals result from their
[A].

slow oxidation

[B].

fast oxidation

[C].

fast hydration

[D].

slow dehydration

Answer: Option A

Explanation:

No answer description available for this question.

Question: __________ iron is produced, when molten pig iron is allowed to cool gradually.
[A].

White cast

[B].

Grey cast

[C].

Wrought

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.