Fuels and Combustion MCQs

Question 1

The fuel ratio of a coal is

Accepted Answer

Both A and B

Answer

The ratio of its percentage of fixed carbon to that of volatile matter

Answer

Helpful in estimation of its rank

Answer

Neither A nor B

Question 2

The weathering index of a coal

Accepted Answer

Is a measure of its size stability, when stored & exposed to weather

Answer

Gives an idea of the fusion temperature of ash

Answer

Is related to its calorific value

Answer

Is a measure of its caking tendency

Question 3

Hardgrove grindability index of four coal samples are given below. Which of them is the easiest to grind?

Accepted Answer

100

Answer

50

Answer

70

Answer

85

Question 4

Ionisation potential applied across the electrodes of electrostatic tar precipitator is around

Accepted Answer

60 KV DC

Answer

230 V AC

Answer

60 KV AC

Answer

230 V DC

Question 5

A coal having higher volatile matter content, has lower

Accepted Answer

Ignition temperature

Answer

Smoking tendency on burning

Answer

Coke oven gas yield on carbonisation

Answer

Chance of catching fire during storage in open space

Question 6

Which of the following fertilisers is produced in the by-products recovery (from coke oven gas) plant attached to an integrated steel plant?

Accepted Answer

Ammonium sulphate

Answer

Ammonium nitrate

Answer

Ammonium phosphate

Answer

None of these

Question 7

A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be

Accepted Answer

Same

Answer

More

Answer

Less

Answer

Data insufficient; can't be predicted

Question 8

Gross calorific value will be equal to the net calorific value for

Accepted Answer

CO

Answer

H2

Answer

C2H2

Answer

C2H6

Question 9

Power alcohol as compared to straight run gasoline has lower

Accepted Answer

Calorific value

Answer

Octane number

Answer

Specific gravity

Answer

Viscosity