Chemical Engineering - Chemical Engineering Basics

36. 

The phenomenon of strain-ageing is generally experienced with

A. cast iron.
B. low carbon steel.
C. high manganese steel.
D. high carbon steel.

Answer: Option B

Explanation:

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37. 

The capacity of a material to absorb energy depends upon both its strength & stiffness. The term 'stiffness' of a material is the opposite of its

A. flexibility
B. plasticity
C. hardness
D. hardenability

Answer: Option A

Explanation:

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38. 

Filler metal is not used in the __________ welding.

A. seam
B. electric spot
C. projection
D. all a, b & c

Answer: Option D

Explanation:

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39. 

The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : Cp of copper is 23 J K-1mole-1)

A. 2300 J
B. 4600 J
C. 230 J
D. 2.3 x 106 J

Answer: Option A

Explanation:

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40. 

Sudden immersion/dipping of red hot steel bar in water makes it

A. malleable & tough.
B. ductile & soft.
C. brittle & hard.
D. none of these.

Answer: Option C

Explanation:

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