Chemical Engineering - Chemical Engineering Basics

36. 

In a titration involving weak acid and strong base, the preferred indicator is

A. Methyl orange
B. Phenolphthalein
C. Ethyl orange
D. Fehling's solution

Answer: Option B

Explanation:

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37. 

Solidification time of a molten metal in a casting is proportional to (where, V = volume of metal & A = its surface area ; in the casting)

A. V/A
B. V/A2
C. V2/A
D. V2/A2

Answer: Option D

Explanation:

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38. 

Pick out the wrong statement.

A. Annealing twins are not observed in pure aluminium, because it has higher strain energy.
B. Load during cold rolling can be lowered by the application of front tension.
C. Very fine grain structure is desirable for high temperature creep application of materials.
D. Soft magnetic materials are those which have less area within the hysterisis loop.

Answer: Option C

Explanation:

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39. 

Minimum diameter of the tube used for making water manometer should be __________ mm to avoid a correction for the effect of capillarity.

A. 1
B. 2.5
C. 4
D. 6

Answer: Option D

Explanation:

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40. 

Which of the following heat treatment processes is used for softening the hardened material ?

A. Normalising
B. Tempering
C. Annealing
D. None of these

Answer: Option B

Explanation:

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