Chemical Engineering

Question: Corrosion in boilers can be prevented by
[A].

deaeration of feed water.

[B].

enhancing pH of feed water by adding alkali.

[C].

feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion.

[D].

all (a), (b) and (c).

Answer: Option D

Explanation:

No answer description available for this question.

Question: Foaming and priming in boiler operation can be reduced by reduction in __________ in feed water.
[A].

turbidity

[B].

color (Hazen)

[C].

total solids

[D].

all (a), (b) & (c)

Answer: Option D

Explanation:

No answer description available for this question.

Question: Peroxyacyl nitrate (PAN), a pollutant is found in the
[A].

automobile exhaust.

[B].

flue gas of coal based power plant.

[C].

exhaust of nitric acid plant.

[D].

exhaust of sulphuric acid plant.

Answer: Option A

Explanation:

No answer description available for this question.

Question: White smoke coming out of the chimney of a furnace indicates the use of
[A].

low excess air.

[B].

very high excess air.

[C].

gaseous fuel in the furnace.

[D].

liquid fuel in the furnace.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace.
[A].

low amount of excess combustion air

[B].

large quantity of excess combustion air

[C].

hydrocarbon fuel

[D].

pulverised coal as fuel

Answer: Option A

Explanation:

No answer description available for this question.

Question: If carbon monoxide content in atmospheric air exceeds __________ ppm, death is bound to occur.
[A].

50

[B].

500

[C].

1000

[D].

3000 (i.e. 0.3%)

Answer: Option D

Explanation:

No answer description available for this question.

Question: Death may occur, when SO2 concentration in atmospheric air exceeds __________ ppm.
[A].

20

[B].

100

[C].

400

[D].

200

Answer: Option C

Explanation:

No answer description available for this question.

Question: Acute danger to human life (i.e. death) exists, if the concentration of CO2 in atmospheric air exceeds __________ percent (by volume).
[A].

1

[B].

3

[C].

7

[D].

20

Answer: Option D

Explanation:

No answer description available for this question.

Question: Maximum allowable concentration of CO2 in air for safe working is __________ ppm (parts per million).
[A].

50

[B].

1000

[C].

2000

[D].

5000

Answer: Option D

Explanation:

No answer description available for this question.

Question: __________ plant emits large amount of SO2 as an air pollutant.
[A].

Nitric acid

[B].

Sulphuric acid

[C].

Chloralkali

[D].

Iron & steel

Answer: Option B

Explanation:

No answer description available for this question.