Chemical Engineering - Chemical Engineering Basics

11. 

__________ method of depreciation calculation ensures that the interest is charged on the cost of machine asset every year on the book value, but the rate of depreciation remains constant every year.

A. Annuity charging
B. Atraight line
C. Ainking fund
D. None of these

Answer: Option B

Explanation:

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12. 

Main alloying element in Elinvar used in precision instruments, hair springs for watches etc. is

A. chromium
B. nickel
C. zinc
D. aluminium

Answer: Option B

Explanation:

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13. 

Color of brass changes from yellow to __________ after its dezincification which exemplifies selective leaching.

A. grey
B. red
C. orange
D. violet

Answer: Option B

Explanation:

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14. 

Heat dissipation in cooling towers is mainly by

A. conduction
B. convection
C. evaporation
D. radiation

Answer: Option C

Explanation:

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15. 

In BOF, desiliconisation is a first order reaction. So the silicon content of the metal decreases

A. linearly with time.
B. exponentially with time.
C. logarithmically with time.
D. in proportion to the square root of time.

Answer: Option A

Explanation:

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