Fuels and Combustion MCQs

Question 1

In general, the limit of inflammability/explosion limit of fuel gases is widened by the

Accepted Answer

All of the above

Answer

Increase in gas pressure

Answer

Increase in temperature (i.e. preheating)

Answer

Use of pure oxygen for combustion instead of air

Question 2

Temperature of coke oven gas just before entering into saturator (for recovery of NH3) is about __________ °C.

Accepted Answer

65

Answer

30

Answer

120

Answer

180

Question 3

Shatter index of the coke is a measure of its

Accepted Answer

Strength

Answer

Bulk density

Answer

Reactivity

Answer

None of these

Question 4

A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the 'carpet loss'. The carpet loss may be of the order of __________ cms.

Accepted Answer

5 to 15

Answer

1 to 2

Answer

3 to 4

Answer

20 to 40

Question 5

'Fat' coal means a coal having

Accepted Answer

High volatile matter

Answer

Low calorific value

Answer

Low ash content

Answer

Non smoking tendency

Question 6

Which of the following is a lean fuel gas?

Accepted Answer

Blast furnace gas

Answer

Coke oven gas

Answer

LPG

Answer

Natural gas

Question 7

Which of the following is unsuitable fuel for producer gas manufacture?

Accepted Answer

Coal having low fusion point of its ash

Answer

Coke

Answer

Anthracite

Answer

Coal having high fusion point of its ash

Question 8

Preheating of coal charge for the coke ovens reduces the

Accepted Answer

All of the above

Answer

Time of carbonisation

Answer

Yield of gas and tar

Answer

Fuel consumption in coking

Question 9

Fossil fuels mean

Accepted Answer

Those fuels which are found in the crust of earth

Answer

Solid fuels

Answer

Liquid fuels

Answer

Premature fuels with low calorific value