Chemical Engineering - Chemical Engineering Basics

16. 

Metal cutting by oxy-acetylene flame is accomplished by the __________ of the metal.

A. burning
B. intensive oxidation
C. evaporation
D. none of these

Answer: Option B

Explanation:

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17. 

The material used for coating the welding electrode is termed as the

A. flux
B. slag
C. protective layer
D. binder

Answer: Option B

Explanation:

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18. 

In an amorphous material, atoms defy any definite atomic structure and exist in random pattern just like in liquid. Which of the following is an amorphous material ?

A. Tin
B. Lead
C. Zinc
D. Glass

Answer: Option D

Explanation:

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19. 

Even though heat transfer co-efficients in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to __________ boiling.

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

Answer: Option A

Explanation:

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20. 

In Newton's law of viscosity, which states that the shear stress is proportional to the __________ Co-efficient of viscosity is called dynamic or absolute viscosity(where, V = velocity, Vg = velocity gradient ).

A. V2
B. 1/V2
C. 1/Vg
D. Vg

Answer: Option D

Explanation:

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