GATE Prev Year : Engineering Materials Test-7

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Question 1

Stress-strain curves are an important graphical measure of material’s mechanical properties. It is seen that strain energy increases quadratically with the stress or strain; i.e. that as the strain increases the energy stored by a given increment of additional strain grows as the square of the strain.

In the Stress Strain Curve as shown, point U is known as:

• AElastic limit
• BYield stress
• CUltimate stress
• DBreaking stress

Question 2

Hook’s law of proportionality in the diagram can be explained between point:

• AOP
• BEY
• CYU
• DUB

Question 3

Which material has the highest electrical conductivity?

• ASilver
• BAluminium
• CIron
• DCopper

Question 4

From the lists given below, choose the most appropriate set of heat treatment process and the corresponding process characteristics ______.

• AP-3 Q-1 R-5
• BP-4 Q-3 R-2
• CP-4 Q-1 R-2
• DP-1 Q-5 R-4

Question 5

The process of reheating the martensitic steel to reduce its brittleness without any significant loss in its hardness is

• Anormalising
• Bannealing
• Cquenching
• Dtempering

Question 6

The atomic packing factor for a material with body centered cubic structure is

• A0.68
• B0.53
• C0.89
• D0.87

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