FUELS AND COMBUSTION QUIZ

Coke made in narrower by-product coke ovens (as compared to wider ovens) is

All of these

Less reactive

Smaller in size

Stronger

TRUE ANSWER : ?
YOUR ANSWER : ?

A coal containing very high percentage of durain is called __________ coal.

Boghead

Non-banded

Bright

Splint

TRUE ANSWER : ?
YOUR ANSWER : ?

Volatile matter content of metallurgical coke may be around __________ percent.

1-2

10-15

22-26

30-33

TRUE ANSWER : ?
YOUR ANSWER : ?

Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because

It reduces its flame temperature tremendously

It reduces its calorific value tremendously

There are chances of explosion during preheating

The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot

TRUE ANSWER : ?
YOUR ANSWER : ?

Coal is heated in absence of air for 7 minutes at a temperature of about __________ °C, during its volatile matter determination for proximate analysis.

750

1150

950

550

TRUE ANSWER : ?
YOUR ANSWER : ?

Preheating of combustion air is done to

Reduce its requirement for effecting the complete combustion

Increase the adiabatic flame temperature

Complete the combustion of fuel

Increase the calorific value of the fuel

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following has the highest heat of combustion?

CO

H₂

C₂H₆

CH₄

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of nitrogen in combustion air does not reduce the

Amount of heat liberated

Any of the above

Flue gas temperature

Flame temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

The fuel ratio of a coal is

Helpful in estimation of its rank

Both A and B

Neither A nor B

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

TRUE ANSWER : ?
YOUR ANSWER : ?

Efficient burning of anthracite coal requires

All of these

Fine grinding

Low preheat of air

High excess air

TRUE ANSWER : ?
YOUR ANSWER : ?