Chemical Engineering - Chemical Engineering Basics

6. 

Semi-conductors normally employ __________ bonding.

A. co-ordinate
B. ionic
C. covalant
D. metallic

Answer: Option C

Explanation:

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7. 

High endurance limit of carburised machine parts is because of the fact that carburisation

A. suppresses any stress concentration produced in the parts.
B. enhances the yield point of the material.
C. introduces a compressive layer on the surface.
D. produces a better surface finish.

Answer: Option C

Explanation:

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8. 

In __________ process, there is an increase in entropy with no degradation of energy.

A. isothermal expansion
B. isochoric heat addition
C. polytropic expansion
D. isobaric heat addition

Answer: Option A

Explanation:

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9. 

Which of the following is categorised as the plastic welding ?

A. Gas welding
B. Electric arc welding
C. Forge welding
D. None of these

Answer: Option C

Explanation:

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10. 

In spite of large heat transfer co-efficients in boiling liquids, fins are used advantageously, where the entire surface is exposed to __________ boiling.

A. film
B. nucleate
C. transition
D. all modes of

Answer: Option D

Explanation:

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