FUELS AND COMBUSTION QUIZ

Deficiency of combustion air during combustion of a gaseous fuel

Lengthens the flame

Both A & B

Causes heat loss of fuel by its partial combustion

Shortens the flame

TRUE ANSWER : ?
YOUR ANSWER : ?

During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the

Incomplete combustion

High oxygen in flue gas

Complete combustion

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is a rich fuel gas?

Producer gas

Refinery gases

None of these

Coal gas from underground gasification of coal

TRUE ANSWER : ?
YOUR ANSWER : ?

A coal having high volatile matter content will

Have a very high calorific value

None of these

Burn with a small non-smoky flame

Give less yield of tar and gas on carbonisation

TRUE ANSWER : ?
YOUR ANSWER : ?

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

7

22

46

1

TRUE ANSWER : ?
YOUR ANSWER : ?

Gray-King Assay and Roga Index of coal is a measure of its

Weathering properties

Abradability

Grindability

Caking and swelling properties

TRUE ANSWER : ?
YOUR ANSWER : ?

Fusion point of coal ash increases with increase in its __________ content.

Iron sulphate

Iron silicate

Lime and magnesia

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

The ratio of maximum adiabatic flame temperature in air to that in pure oxygen is always

1

> 1

Unpredicatable

TRUE ANSWER : ?
YOUR ANSWER : ?

In low temperature carbonisation of coal, the

Temperature maintained is 700°C

Volatile matter in coke is zero

Yield of coke oven gas is 290 Nm³ /ton dry coal

Yield of tar is about 3% of dry coal

TRUE ANSWER : ?
YOUR ANSWER : ?

Washing of coal is done to reduce the

Inherent impurities

Both B and C

Mineral matter

Adhering impurities

TRUE ANSWER : ?
YOUR ANSWER : ?

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