Chemical Engineering Basics-2 - Chemical Engineering Questions and Answers

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Between 230 and 370°C, blue brittleness is caused in mild steel because of the

A.

Immobility of dislocation

B.

Strain-ageing

C.

Increase in Young's modulus

D.

Strain hardening

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Metal shots used in shot blasting are made of

A.

Stellite

B.

Steel

C.

Bronze

D.

Lead

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Which of the following is the most effective inhibitor of grain growth, when added in small quantity in steel ?

A.

Manganese

B.

Vanadium

C.

Cobalt

D.

Copper

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Fibrous fracture is normally encountered in the __________ materials.

A.

Hard

B.

Elastic

C.

Ductile

D.

Brittle

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Wood is a/an __________ material.

A.

Amorphous

B.

Cellular

C.

Homogeneous

D.

Grannular

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Lead is most readily dissolved in

A.

Acetic acid

B.

Hydrochloric acid

C.

Nitric acid

D.

Sulphuric acid

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Holes in a plate for rivetted joints is preferably made by

A.

Drilling

B.

Tapping

C.

Reaming

D.

Punching

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Hard magnetic materials have high

A.

Coercive force

B.

Residual magnetic induction

C.

Both A & B

D.

Neither A nor B

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Melting point & boiling points of liquid oxygen are respectively - 218.8°C & - 183°C, while the same for liquid nitrogen is - 210°C & - 195.8°C respectively. The difference in melting points of liquid oxygen & liquid nitrogen is not equal to 8.8

A.

°C

B.

°F

C.

°K

D.

°R