Fuels and Combustion MCQs

Question 1

The combustion reaction, C + O2 = CO2, is

Accepted Answer

Exothermic

Answer

Endothermic

Answer

Autocatalytic

Answer

None of these

Question 2

For long flame and easy ignition, the coal used should have

Accepted Answer

High volatile matter

Answer

Low ash

Answer

High calorific value

Answer

High ash

Question 3

The calorific value of L.D. converter gas is about __________ kcal/Nm3.

Accepted Answer

1800

Answer

800

Answer

4500

Answer

10000

Question 4

Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of

Accepted Answer

Too much air for combustion

Answer

Less air for combustion

Answer

Correct amount of air for combustion

Answer

Pulverised coal in boilers

Question 5

Calorific value of coke oven gas is around __________ kcal/Nm3.

Accepted Answer

4200

Answer

900

Answer

7500

Answer

2000

Question 6

Calorific value of of blast furnace gas is around __________ kcal/Nm3.

Accepted Answer

850

Answer

1800

Answer

4200

Answer

6500

Question 7

Presence of free moisture in coal is most disadvantageous during

Accepted Answer

Its pulverisation (as it requires more power)

Answer

Combustion of fire slacks on the grates

Answer

Handling (e.g. when emptying wagons)

Answer

None of these

Question 8

Which of the following is not a 'manufactured' fuel?

Accepted Answer

Tar

Answer

LPG

Answer

Coal briquettes

Answer

Colloidal fuels

Question 9

Laboratory gas is obtained by the cracking of

Accepted Answer

Kerosene

Answer

Gasoline

Answer

Diesel

Answer

Fuel oil