Fuels and Combustion

Question: A coal having higher volatile matter content will necessarily have lower
[A].

ash fusion temperature.

[B].

calorific value.

[C].

ignition temperature.

[D].

caking index.

Answer: Option C

Explanation:

No answer description available for this question.

Question: __________ present in coal is not determined in its ultimate analysis.
[A].

Fixed carbon

[B].

Total carbon

[C].

Hydrogen

[D].

Nitrogen.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Number of macrocomponents present in coal according to Stopes are
[A].

four

[B].

five

[C].

six

[D].

two

Answer: Option A

Explanation:

No answer description available for this question.

Question: Which of the following oil gasification processes is non-catalytic ?
[A].

Semet-Solvay process

[B].

Segas process

[C].

Onia-Gegi process

[D].

Steam reforming of naphtha

Answer: Option A

Explanation:

No answer description available for this question.

Question: Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about____°C.
[A].

70

[B].

85

[C].

105

[D].

145

Answer: Option C

Explanation:

No answer description available for this question.

Question: Furnace oil consumption in a furnace for a given duty employing preheated combination air (at 300° ) may be reduced by about __________ percent as compared to the use of atmospheric combustion air.
[A].

5

[B].

10

[C].

20

[D].

35

Answer: Option C

Explanation:

No answer description available for this question.

Question: A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the ‘carpet loss’. The carpet loss may be of the order of __________ cms.
[A].

1 to 2

[B].

3 to 4

[C].

5 to 15

[D].

20 to 40

Answer: Option C

Explanation:

No answer description available for this question.

Question: ‘Wind loss’ resulting from unscientific storage of coal may be the order of about __________ percent.
[A].

2.5

[B].

7.5

[C].

10.5

[D].

14.5

Answer: Option A

Explanation:

No answer description available for this question.

Question: Gas yield in the Kopper-Totzek coal gasifier is about __________ Nm3/ton coal (ash = 35%).
[A].

150

[B].

1500

[C].

3500

[D].

5000

Answer: Option B

Explanation:

No answer description available for this question.

Question: With increase in C/H ratio of a fuel, the amount of CO2 formed on its complete combustion
[A].

increases

[B].

decreases

[C].

remains same

[D].

either (a) or (b), depends on other factors

Answer: Option A

Explanation:

No answer description available for this question.