Fuels and Combustion

Question: Ammonia content in raw coke oven gas is about __________ gm/Nm3.
[A].

1

[B].

15

[C].

50

[D].

100

Answer: Option B

Explanation:

No answer description available for this question.

Question: One kg of carbon for theoretically complete combustion requires __________ kg of air.
[A].

11.5

[B].

0.5

[C].

23

[D].

12

Answer: Option A

Explanation:

No answer description available for this question.

Question: Oxygen required for theoretically complete combustion of 1 Nm3 methane is __________ Nm3.
[A].

2

[B].

4

[C].

6

[D].

1

Answer: Option A

Explanation:

No answer description available for this question.

Question: With increase in C/H ratio of a fuel, the dew point of flue gases
[A].

increases

[B].

decreases

[C].

remains same

[D].

may increase or decrease ; depends on the type of fuel

Answer: Option B

Explanation:

No answer description available for this question.

Question: If CO2 is not fully absorbed by the KOH solution meant for its absorption in the orsat apparatus, it will appear as
[A].

O2

[B].

CO

[C].

N2

[D].

SO2

Answer: Option D

Explanation:

No answer description available for this question.

Question: KOH solution used in orsat apparatus absorbs
[A].

CO2

[B].

SO2

[C].

both (a) & (b)

[D].

neither (a) nor (b)

Answer: Option C

Explanation:

No answer description available for this question.

Question: Calorific value of
[A].

light paraffinic fuel oils is equal to that of equivalent olefins.

[B].

n-paraffin is lower than that of iso-paraffins of the same compounds.

[C].

light paraffinic fuel oils is higher than that of equivalent olefins.

[D].

light paraffinic fuel oils is lower than that of equivalent olefins.

Answer: Option C

Explanation:

No answer description available for this question.

Question: As the C/H ratio of the fuel increases, the amount of CO2 formed on combustion __________ for the same percentage of excess air.
[A].

decreases

[B].

increases

[C].

remains same

[D].

may increase or decrease depending on the type of fuel

Answer: Option B

Explanation:

No answer description available for this question.

Question: Moisture loss is determined by the
[A].

humidity of combustion air.

[B].

moisture content of fuel.

[C].

both (a) and (b).

[D].

the water formed by combustion reaction.

Answer: Option C

Explanation:

No answer description available for this question.

Question: A sooty flame can be made non-luminous by
[A].

admitting more gas.

[B].

shutting gas supply.

[C].

admitting more air.

[D].

shutting air supply.

Answer: Option C

Explanation:

No answer description available for this question.