Fuels and Combustion MCQs

Question 1

Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around __________ percent.

Accepted Answer

80 and 97

Answer

95 and 100

Answer

40 and 70

Answer

25 and 97

Question 2

Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has

Accepted Answer

Neither A nor B

Answer

Higher calorific value

Answer

Lower hydrogen content

Answer

Both A & B

Question 3

As the equilibrium moisture content of the coal increases, its

Accepted Answer

Swelling number decreases

Answer

Calorific value increases

Answer

Swelling number increases

Answer

Bulk density decreases

Question 4

A coal with high __________ content, would ignite most easily.

Accepted Answer

Volatile matter

Answer

Fixed carbon

Answer

Ash

Answer

Oxygen

Question 5

Main constituents of purified Lurgi gas are

Accepted Answer

CO, H2 & CH4

Answer

H2, CmHn & CO2

Answer

CO2, O2 & CO

Answer

N2, H2 & CO2

Question 6

Preheating of a gaseous fuel results in increased

Accepted Answer

Flame temperature

Answer

Flame length

Answer

Quantity of flue gas

Answer

Ignition temperature

Question 7

The shift conversion reaction taking place during water gas manufacture is given by

Accepted Answer

CO + H2O ⟷ CO2 + H2

Answer

C + H2O ⟷ CO + H2

Answer

C + 2H2O ⟷ CO2 + 2H2

Answer

None of these

Question 8

In high temperature carbonisation (as compared to low temperature carbonisation) of coal

Accepted Answer

All of the above

Answer

Coke oven gas yield is more

Answer

Tar yield is less but free carbon in tar is more

Answer

Calorific value of coke oven gas is less

Question 9

In low temperature carbonisation (as compared to high temperature carbonisation) of coal

Accepted Answer

Aliphatic tar is produced

Answer

Ammonia yield is more

Answer

Free carbon in tar is more

Answer

All of the above