Chemical Engineering - Chemical Engineering Basics

16. 

Half life of a radioactive isotope corresponds to the time required for half of the __________ to decay.

A. atoms
B. neutrons
C. nucleons
D. electrons

Answer: Option A

Explanation:

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17. 

The product of a commercial direct reduction process is

A. liquid iron
B. solid iron
C. sponge iron
D. iron saturated with carbon

Answer: Option C

Explanation:

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18. 

In the diving apparatus, helium is used along with oxygen, because it is

A. easily available.
B. not soluble in blood at high pressure.
C. lighter than nitrogen.
D. completely miscible with oxygen.

Answer: Option B

Explanation:

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19. 

Materials having resistivity ranging from 1 to 100 ohm. cm is termed as

A. conductor
B. insulator
C. semi-conductor
D. none of these

Answer: Option C

Explanation:

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20. 

During sensible cooling of air, its wet bulb temperature

A. decreases but dew point remains constant.
B. increases but dew point remains constant.
C. increases & the dew point decreases.
D. decreases & the dew point increases.

Answer: Option B

Explanation:

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