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Engineering-materials Questions Set 27:

Quiz Mode

Which aluminum alloy is commonly used in aircraft construction?

6061

7075

6063

7068

Solution:

In Wöhler's fatigue test, how many cycles can cast iron withstand before failure?

10,000,000

100,000,000

5,000,000

1,000,000

Solution:

Which of the following materials generally exhibits a yield point?

Cast iron

Annealed and hot-rolled mild steel

Soft brass

Cold-rolled steel

Solution:

In which type of dislocation is an extra plane of atoms inserted inside the crystal?

Edge dislocation

Screw dislocation

Jog dislocation

Mixed dislocation

Solution:

A crystallographic plane intersecting a cubic unit cell at coordinates x = 1/2, y = 1, z = 1/3. The Miller indices of this plane are:

[2 1 3]

[1 0 1]

[1 2 1]

[1 1 3]

Solution:

What type of dislocation has a line direction and Burgers vector that are neither perpendicular nor parallel?

Screw dislocation

Edge dislocation

Jog dislocation

Mixed dislocation

Solution:

Chemicals attack atoms within grain boundaries preferentially because they have

lower energy than those in the grains

higher energy than those in the grains

higher number of atoms than in the grains

lower number of atoms than in the grains

Solution:

What does primary creep indicate in a creep curve?

It represents creep at a constant rate.

Due to deformation, the resistance of the metal increases.

Due to deformation, the resistance of the metal decreases.

It represents a high strain rate.

Solution:

Which of the following relationships holds true?

There is no relationship between the melting temperature and elastic modulus

Higher the melting temperature, greater is the elastic modulus

Lower the melting temperature, greater is the elastic modulus

Higher the melting temperature, smaller is the elastic modulus

Solution:

Which of the following statements about heat treatment processes is not true?

Quenching is a heat treatment process that involves heating the material above the recrystallization temperature and cooling it suddenly in a water bath or oil bath.

Tempering is a heat treatment process that involves heating the material to a temperature below the recrystallization value and holding it for a few hours.

Full Annealing is a heat treatment process that involves heating the steel to a temperature above the critical range and then cooling it slowly.

Normalizing is a heat treatment process that involves heating the steel to about 50 degrees Celsius above the upper critical temperature, which will be followed by air cooling.

Engineering-materials Questions Set 27:

Which aluminum alloy is commonly used in aircraft construction?

Solution:

In Wöhler's fatigue test, how many cycles can cast iron withstand before failure?

Solution:

Which of the following materials generally exhibits a yield point?

Solution:

In which type of dislocation is an extra plane of atoms inserted inside the crystal?

Solution:

A crystallographic plane intersecting a cubic unit cell at coordinates x = 1/2, y = 1, z = 1/3. The Miller indices of this plane are:

Solution:

What type of dislocation has a line direction and Burgers vector that are neither perpendicular nor parallel?

Solution:

Chemicals attack atoms within grain boundaries preferentially because they have

Solution:

What does primary creep indicate in a creep curve?

Solution:

Which of the following relationships holds true?

Solution:

Which of the following statements about heat treatment processes is not true?

Solution:

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