MCQs on Chemical Engineering - 20

1. Consider the following statements for reducing the systematic errors in chemical quantitative analysis:

1. Calibration of apparatus and application of corrections
2. Running of blank determination
3. Running a control determination
4. Running parallel determinations

Which of the above statements are correct?
(a) 1, 2 and 3 only
(b) 1, 2 and 4 only
(c) 1, 3 and 4 only
(d) 1, 2, 3 and 4

Answer: (d)

2. Aqua regia is:

Answer: (a)

3. In the production of soda ash by Solvay process, the by-product is

Answer: (a)

4. During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160° 𝐶, as
(a) It is very corrosive at elevated temperature
(b) Its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced)
(c) It decomposes on further increasing the temperature
(d) None of these

Answer: (b)

5. The chemical formula of a bone phosphate of lime is

Answer: (b)

6. Cement mainly contains

Answer: (a)

7. Dittus-Boelter equation used for predicting the tube-side heat transfer coefficient is in the range of:
(a) Reynolds number 𝑅 ≤4000
(b) Reynolds number 𝑅 ≤8000
(c) Reynolds number 𝑅 >10,000
(d) Reynolds number 𝑅 >5,000

Answer: (c)

8. Which one of the following medium is required for the transfer of heat by electromagnetic waves or photons?
(a) Solid
(b) Liquid
(c) No medium
(d) Gases

Answer: (c)

 9. Which one of the following chemical conversion reaction will be adopted in the process of ‘Acylation’?

(a) Electrolysis
(b) Esterification
(c) Double decomposition
(d) Fermentation

Answer: (c)

10. Consider the following characteristics of chemical conversions during their manufacturing:
1. Each chemical conversion is one of a family of numerous individual reactions that are similar in energy change, reaction pressure and /or temperature, reaction time, equilibrium or raw materials
2. Frequently there is factory segregation wherein a building is devoted to making single product by means of a single type of chemical conversions
3. Where production is small or products variable, equipment may be conveniently and economically transferred from the making of one chemical to that of another based on the same chemical conversion
4. Since the basis of chemical conversion classification is a chemical one, stress is placed on the chemical reaction

Which of the above statements are correct?
(a) 1, 2 and 3 only
(b) 1, 3 and 4 only
(c) 1, 2 and 4 only
(d) 2, 3 and 4 only

Answer: (b)
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