Mechanical Engineering

Question: The casting ability of aluminium increases when __________ is added to aluminium.
[A].

copper

[B].

magnesium

[C].

silicon

[D].

lead and bismuth

Answer: Option C

Explanation:

No answer description available for this question.

Question: The aluminium alloy made by melting aluminium with 2 to 10% magnesium and 1.75% copper is called
[A].

duralumin

[B].

Y-alloy

[C].

magnalium

[D].

hindalium

Answer: Option C

Explanation:

No answer description available for this question.

Question: Duralumin has better strength than Y-alloy at high temperature.
[A].

True

[B].

False

Answer: Option B

Explanation:

No answer description available for this question.

Question: Aluminium has low density and addition of silicon improves its fluidity and therefore, its castability.
[A].

Correct

[B].

Incorrect

Answer: Option A

Explanation:

No answer description available for this question.

Question: The aluminium alloy, mainly used, for anodized utensil manufacture, is
[A].

duralumin

[B].

Y-alloy

[C].

magnalium

[D].

hindalium

Answer: Option D

Explanation:

No answer description available for this question.

Question: Y-alloy contains
[A].

3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium

[B].

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

[C].

4 to 4.5% magnesium, 3 to 4% copper and rest aluminium

[D].

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

Answer: Option B

Explanation:

No answer description available for this question.

Question: Which of the following statement is incorrect about duralumin?
[A].

It is prone to age hardening

[B].

It can be forged

[C].

It has good machining properties

[D].

It is lighter than pure aluminium

Answer: Option D

Explanation:

No answer description available for this question.

Question: Duralumin contains
[A].

3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium

[B].

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

[C].

4 to 4.5% magnesium, 3 to 4% copper and rest aluminium

[D].

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

Answer: Option A

Explanation:

No answer description available for this question.

Question: An aluminium alloy with 11% silicon is used for making engine pistons by die casting technique.
[A].

Yes

[B].

No

Answer: Option A

Explanation:

No answer description available for this question.

Question: Age hardening is related to
[A].

duralumin

[B].

brass

[C].

copper

[D].

silver

Answer: Option A

Explanation:

No answer description available for this question.