Mechanical Engineering

Question: Which of the following solids are malleable and ductile?
[A].

Ionic solids

[B].

Covalent solids

[C].

Metallic solids

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: The bond formed by transferring electrons from one atom to another is called
[A].

ionic bond

[B].

covalent bond

[C].

metallic bond

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Closed packed hexagonal space lattice is found in
[A].

zinc, magnesium, cobalt, cadmium, antimony and bismuth

[B].

gamma-iron, aluminium, copper, lead, silver and nickel

[C].

alpha-iron, tungsten, chromium and molybdenum

[D].

none of the above

Answer: Option A

Explanation:

No answer description available for this question.

Question: Face centred cubic space lattice is found in gamma-iron, aluminium, copper, lead, silver and nickel.
[A].

True

[B].

False

Answer: Option A

Explanation:

No answer description available for this question.

Question: Body centred cubic space lattice is found in
[A].

zinc, magnesinm, cobalt, cadmium, antimony and bismuth

[B].

gamma-iron, aluminium, copper, lead, silver and nickel

[C].

alpha-iron, tungsten, chromium and molybdenum

[D].

none of the above

Answer: Option C

Explanation:

No answer description available for this question.

Question: In a unit cell of close packed hexagonal space lattice, there are twenty four atoms.
[A].

Correct

[B].

Incorrect

Answer: Option B

Explanation:

No answer description available for this question.

Question: In a unit cell of a body centred cubic space lattice, there are __________ atoms.
[A].

six

[B].

nine

[C].

fourteen

[D].

seventeen

Answer: Option B

Explanation:

No answer description available for this question.

Question: The austenitic stainless steel contains
[A].

18% chromium and 8% nickel

[B].

8% chromium and 18% nickel

[C].

14% chromium and 0.35% carbon

[D].

14% nickel and 0.35% carbon

Answer: Option A

Explanation:

No answer description available for this question.

Question: A steel containing 16 to 18% chromium and about 0.12% carbon is called
[A].

ferritic stainless steel

[B].

austenitic stainless steel

[C].

martensitic stainless steel

[D].

nickel steel

Answer: Option A

Explanation:

No answer description available for this question.

Question: A steel containing 12 to 14% chromium and 0.12 to 0.35% carbon is called martensitic stainless steel.
[A].

True

[B].

False

Answer: Option A

Explanation:

No answer description available for this question.