Fuels and Combustion MCQs

Question 1

Washing of coal

Accepted Answer

All of the above

Answer

Reduces its sulphur and ash content

Answer

Controls its ash fusibility and increases its calorific value

Answer

Improves its coking properties

Question 2

Washing of coal

Accepted Answer

All of the above

Answer

Reduces its ash & sulphur content

Answer

Improves its coking properties

Answer

Increase the fusion point of its ash by removing chlorine compounds

Question 3

Washing of coal decreases its

Accepted Answer

Mineral matter content

Answer

Caking index

Answer

Ash content

Answer

Both B and C

Question 4

For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3), while the C.V. is same on weight basis (i.e., kcal/kg)?

Accepted Answer

Propane and acetylene

Answer

Propane and LPG

Answer

Sewage gas and gobar gas

Answer

B.F. gas and coke oven gas

Question 5

Which of the following is not a by-product fuel?

Accepted Answer

Producer gas

Answer

Blast furnace gas

Answer

Coke oven gas

Answer

Refinery gas

Question 6

Which of the following is not a by-product fuel?

Accepted Answer

Producer gas

Answer

Sewage gas

Answer

Refinery gas

Answer

Bagasse

Question 7

Carbon Content by weight in air dried wood may be about __________ percent.

Accepted Answer

50

Answer

10

Answer

25

Answer

80

Question 8

Volatile matter content in coking coal may be about __________ percent.

Accepted Answer

22

Answer

1

Answer

7

Answer

46

Question 9

Dry air required to burn 1 kg of carbon completely may be around __________ kg.

Accepted Answer

11

Answer

2

Answer

20

Answer

38