Fuels and Combustion MCQs

Question 1

Which will have the least volatile matter and hence will be the most difficult to ignite?

Accepted Answer

Coke

Answer

Bituminous coal

Answer

Semi-bituminous coal

Answer

Aanthracite

Question 2

Ratio of primary air to secondary air increases with increase in the rank of coal, because the

Accepted Answer

Ratio of fixed carbon to volatile matter increases

Answer

High rank coals have higher amount of volatile matter

Answer

Oxygen content progressively decreases

Answer

Calorific value of the coal increases

Question 3

White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is

Accepted Answer

Coke oven gas

Answer

Tar

Answer

Pitch

Answer

Pulverised coke

Question 4

Calorific value of both the solid & liquid fuels can be determined by using __________ calorimeter.

Accepted Answer

Bomb

Answer

Junker's

Answer

Boy's

Answer

None of these

Question 5

Oxygen percentage (by weight) in atmospheric air is

Accepted Answer

23

Answer

19

Answer

21

Answer

29

Question 6

Which of the following can be made into briquettes without the use of a binder?

Accepted Answer

Lignite

Answer

Bituminous coal

Answer

Anthracite coal

Answer

None of these

Question 7

Octane number of 2, 2, 4 - trimethyl pen-tane is

Accepted Answer

100

Answer

0

Answer

In between 0 and 100

Answer

More than 100

Question 8

During coking of coal, the ash content (percentage)

Accepted Answer

Increases

Answer

Decreases

Answer

Remains constant

Answer

None of these

Question 9

Abel apparatus is used for those oils, whose flash points are___°F.

Accepted Answer

<120

Answer

>120

Answer

>280

Answer

300-600