Fuels and Combustion MCQs

Question 1

Calorific values of both the solid as well as the liquid fuels can be determined by __________ calorimeter.

Accepted Answer

Bomb

Answer

Boy's

Answer

Junkar's

Answer

None of these

Question 2

Calorific value as determined by bomb calorimeter is the

Accepted Answer

Higher calorific value at constant volume

Answer

Gross calorific value at constant pressure

Answer

Lower calorific value at constant pressure

Answer

Net calorific value at constant volume

Question 3

Which of the following is the most poisonous gas?

Accepted Answer

L.D. converter gas

Answer

Coke oven gas

Answer

Producer gas

Answer

Blast furnace gas

Question 4

Efficient burning of anthracite coal requires

Accepted Answer

Fine grinding

Answer

Low preheat of air

Answer

High excess air

Answer

All of the above

Question 5

Washing of coal does not reduce its

Accepted Answer

None of these

Answer

S & P content

Answer

Heating value

Answer

Fusion point of ash

Question 6

Nitrogen in coal

Accepted Answer

All of the above

Answer

Is present upto 1-2%

Answer

Comes from protein in parent vegetable matter

Answer

Is recovered as ammonia during its carbonisation

Question 7

Oxygen required for theoretically complete combustion of 1 Nm3 methane is __________ Nm3.

Accepted Answer

2

Answer

4

Answer

6

Answer

1

Question 8

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

Accepted Answer

Lack of thorough mixing of fuel with air

Answer

Presence of large quantity of hydrogen in the fuel

Answer

Low calorific value of the fuel

Answer

High sulphur content in the fuel

Question 9

Coking time in narrow by-product coke ovens is around __________ hours.

Accepted Answer

18

Answer

48

Answer

8

Answer

80