Fuels and Combustion

Question: A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the
[A].

presence of large quantity of hydrogen in the fuel.

[B].

low calorific value of the fuel.

[C].

high sulphur content in the fuel.

[D].

lack of thorough mixing of fuel with air.

Answer: Option D

Explanation:

No answer description available for this question.

Question: Net calorific value is the gross calorific value less the __________ heat of water in the product of combustion when cooled to 15°C.
[A].

sensible

[B].

latent

[C].

sensible and latent

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: Initial pressure of oxygen introduced into the ‘bomb’ of the bomb calorimeter for determination of calorific value of coal/fuel oil may be around __________ atm.
[A].

3-5

[B].

25-30

[C].

60-65

[D].

95-100

Answer: Option B

Explanation:

No answer description available for this question.

Question: A fuel with high heat release rate will
[A].

require smaller combustion chamber.

[B].

have high calorific value.

[C].

have high adiabatic flame temperature.

[D].

none of these.

Answer: Option A

Explanation:

No answer description available for this question.

Question: The average molecular weight of a flue gas having the composition by volume as CO2 = 25%, O2 = 25%, N2 = 50% will be
[A].

27.6

[B].

23

[C].

47.3

[D].

42.9

Answer: Option B

Explanation:

No answer description available for this question.

Question: Junker’s calorimeter is used to determine the calorific value of
[A].

pulverised coal

[B].

gaseous fuels

[C].

fuel oil

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: Fuel for a fast breeder nuclear reactor is
[A].

plutonium

[B].

uranium

[C].

radium

[D].

neptunium

Answer: Option A

Explanation:

No answer description available for this question.

Question: Fuel for a nuclear reactor (thermal) is
[A].

uranium

[B].

plutonium

[C].

radium

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Gross heating value of coal is __________ the net heating value.
[A].

higher than

[B].

lower than

[C].

same as

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: (64-132) rank coal (ASTM) means a coal with 64%
[A].

fixed carbon and having a heating value around 13, 200 BTU/1b.

[B].

ash and heating value around 13, 200 BTU/1b.

[C].

fixed carbon and heating value around 132 BTU/1b.

[D].

none of these.

Answer: Option A

Explanation:

No answer description available for this question.