Chemical Engineering - Chemical Engineering Basics

21. 

Aromatics are desired constituents of

A. lubricating oil
B. diesel
C. kerosene
D. petrol

Answer: Option C

Explanation:

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22. 

Galvanic corrosion

A. occurs in a bimetal couple.
B. occurs in highly stressed metallic parts only.
C. is exemplified by caustic embrittlement of boiler tubes.
D. is also called dezincification.

Answer: Option A

Explanation:

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23. 

Increasing the temperature of a material makes it

A. harder
B. softer
C. tougher
D. stronger

Answer: Option B

Explanation:

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24. 

Which of the following absorbs maximum heat in a high pressure boiler ?

A. Economiser
B. Steam superheater
C. Air preheater
D. Furnace water wall

Answer: Option D

Explanation:

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25. 

The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge)

A. x1.5
B. x0.8
C. x-1.5
D. x-0.8

Answer: Option B

Explanation:

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