Fuels and Combustion MCQs

Question 1

Degree of carbonisation of coal during coke making can be roughly judged by the __________ of the coke produced.

Accepted Answer

Volatile matter

Answer

Colour

Answer

Moisture content

Answer

Ash content

Question 2

With increase in moisture content of coal, its

Accepted Answer

Caking properties diminish

Answer

Calorific value increases

Answer

Swelling during carbonisation becomes excessive

Answer

None of these

Question 3

Ignition temperature of a fuel in air is __________ that in pure oxygen.

Accepted Answer

More than

Answer

Less than

Answer

Equal to

Answer

Either more or less; depends on the type of fuel

Question 4

The average molecular weight of a flue gas having the composition by volume as CO2 = 25%, O2 = 25%, N2 = 50% will be

Accepted Answer

23

Answer

27.6

Answer

47.3

Answer

42.9

Question 5

High sulphur (4-6%) coal in India are found in

Accepted Answer

Assam

Answer

Andhra Pradesh

Answer

Bengal

Answer

Madhya Pradesh

Question 6

Which of the following is not used as a binder in coal briquetting?

Accepted Answer

Line

Answer

Tar

Answer

Molasses

Answer

Pitch

Question 7

A coal with high ash content

Accepted Answer

Is harder and stronger

Answer

Has higher calorific value

Answer

Is not subjected to washing

Answer

Has low quantity of mineral matter

Question 8

Artificial draught produced by a fan can be controlled by the

Accepted Answer

All of the above

Answer

Speed of the fan

Answer

Damper

Answer

Variation in the pitch of the fan blades

Question 9

A good metallurgical coke

Accepted Answer

Should have high porosity

Answer

Should be brittle

Answer

Must contain moderate quantities of ash, moisture, sulphur and volatile matters

Answer

Should have low fusion point of its ash