Chemical Engineering - Chemical Engineering Basics

21. 

Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog?

A. Nitrogen oxides
B. Hydrocarbons
C. both 'a' & 'b'
D. Carbon monoxide

Answer: Option C

Explanation:

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22. 

If Reynolds number is greater than 1, then the

A. viscous force is larger than the inertia force.
B. inertia force is larger than the viscous force.
C. inertia force is larger than the surface tension force.
D. inertia force is larger than the gravitational force.

Answer: Option B

Explanation:

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23. 

The type of pump used for lifting large quantity of sewage is a __________ pump.

A. gear
B. centrifugal
C. reciprocating
D. plunger

Answer: Option B

Explanation:

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24. 

Which of the following metals is not subjected to electrolytic refinning/purification?

A. Copper
B. Zinc
C. Tin
D. Aluminium

Answer: Option C

Explanation:

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25. 

The most important function of a washer is to provide bearing area and washers are normally specified by their hole diameters. The diameter of washer as compared to the nut is

A. more
B. less
C. same
D. more but less than the diameter of bolt

Answer: Option A

Explanation:

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