FUELS AND COMBUSTION QUIZ

The function of secondary combustion air is to

Pneumatically convey the pulverised coal

Burn the lumpy coal

Completely burn the volatile matter

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

The difference between total carbon and fixed carbon of coal will be minimum in case of

Anthracite

High temperature coke (V.M < 0.5%)

Lignite

Bituminous coal

TRUE ANSWER : ?
YOUR ANSWER : ?

Combustion reaction of fuels is a/an __________ reaction.

Endothermic

None of these

Exothermic

Auto catalytic

TRUE ANSWER : ?
YOUR ANSWER : ?

Fussain

All of these

Is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation

Is friable, charcoal like substance

Has highest fixed carbon and lowest volatile matter content of all the four banded components of coal

TRUE ANSWER : ?
YOUR ANSWER : ?

A travelling grate stoker is meant for the efficient burning of __________ coal.

Caking

Non-caking

Pulverised

High ash

TRUE ANSWER : ?
YOUR ANSWER : ?

A coal having higher volatile matter content will necessarily have lower

Ignition temperature

Calorific value

Ash fusion temperature

Caking index

TRUE ANSWER : ?
YOUR ANSWER : ?

Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the __________ of coal.

Gasification

Carbonisation

Hydrogenation

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Function of secondary air in pulverised coal firing is to

Reduce primary air requirement

Dry the coal

Transport the coal to the burner

Ensure efficient burning of coal around the burner

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following has the highest flame speed?

H₂

CO

CH₄

C₂H₆

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following accounts for maximum energy loss in a boiler?

Ash content in the fuel

Incomplete combustion

Flue gases

Unburnt carbon in flue gases

TRUE ANSWER : ?
YOUR ANSWER : ?