GATE Prev Year : Engineering Materials Test-3

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Question 1

If a particular Fe–C alloy contains less than 0.83% carbon, it is called

• Ahigh speed steel
• Bhypoeutectoid steel
• Chypereutectoid steel
• Dcast iron

Question 2

The material property which depends only on the basic crystal structure is

• Afatigue strength
• Bwork hardening
• Cfracture strength
• Delastic constant

Question 3

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 4

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

• AOP
• BEY
• CYU
• DUB

Question 5

The following data are collected during a tensile test in which
The starting gage length =125.0 mm 
The cross- sectional area = 62.5 mm²:
Load (N) 0 17,793 23,042 27,579 28,913 27,578 20,462
Length (mm) 0 ,125.23, 131.25, 140.05, 147.01, 153.00, 160.10
The maximum load is 28,913 N and the final data point occurred immediately prior to failure.
Determine modulus of elasticity E.

• A168,625 MPa
• B102,215 MPa
• C191,005 MPa
• D123,145 MPa

Question 6

Based on results of a tensile test, the flow curve has parameters calculated as n = 0.40 and K =551.6 MPa. Based on this information, calculate the tensile strength for the metal.

• A185.5 MPa
• B414.4 MPa
• C325.7 MPa
• D256.43MPa

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