Chemical Engineering Basics - Chemical Engineering Questions and Answers

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The thickness of oxide film is y at time t. If K₁, K₂ and K₃ are the temperature dependent constants, the parabolic law of oxidation is given by

y² = 2k₁t + k₂

y = k₁ ln (k₂t + k₃)

y = k₁ t + k₂

y = k₁t³ + k₂

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Which of the following has the least value of ultimate tensile strength (UTS) ?

Medium carbon steel

High carbon steel

Cast iron

Wrought iron

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Which of the following is a commonly used manometric liquid for low pressure range?

Ethyl alcohol

Carbon tetrachloride

Glycerol

Ethylene glycol

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The highest stress that a material can withstand for a specified length of time without excessive deformation is called the __________ strength.

creep

endurance

fatigue

none of these

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Temperature profile along the length of a gas-gas counter flow heat exchanger is correctly represented by

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Metal shots used in shot blasting are made of

stellite

steel

bronze

lead

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At the point of boundary layer separation in fluid flow, the

shear stress is maximum.

velocity gradient is flat.

density variation is maximum.

shear stress is zero.

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Brinell Hardness Number (BHN) for talc is approximately in the range of

1-5

20-30

100-150

200-250

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A spring material should have low

elastic limit

deflection value

fatigue resistance

none of these