FUELS AND COMBUSTION QUIZ

Yield of blast furnace gas is about __________ Nm³ /ton of pig iron.

2000

5000

300

10000

TRUE ANSWER : ?
YOUR ANSWER : ?

Junker's calorimeter is used to determine the calorific value of

Gaseous fuels

None of these

Fuel oil

Pulverised coal

TRUE ANSWER : ?
YOUR ANSWER : ?

Nitrogen present in the flue gas is determined in the orsat apparatus by absorbing it in

Ammoniacal cuprous chloride

KOH

None of these

Pyrogallol solution

TRUE ANSWER : ?
YOUR ANSWER : ?

Caking index of the coal blend used for the manufacture of metallurgical coke should be around

21

5

48

40

TRUE ANSWER : ?
YOUR ANSWER : ?

Anthracite coal

Burns with short, bluish, yellow-tipped flame producing very little smoke

Contains more volatile matter than bituminous coal

Ignites more easily than bituminous coal

Is essentially a coking coal

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler ?

Bag filter

Hydrocyclones

Wet scrubber

Multicyclones

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Pulverised

Caking

Non-caking

High ash

TRUE ANSWER : ?
YOUR ANSWER : ?

Low temperature oxidation of stored coal results in the

Decrease in its carbon & hydrogen content

Increase in its oxygen content

All of these

Decrease in its caking power & calorific value

TRUE ANSWER : ?
YOUR ANSWER : ?

Grindability index of a coal is 100. It implies that the

Coal can be easily pulverised

Power consumption in grinding the coal will be very high

Coal can't be pulverised

Coal can be pulverised with great difficulty

TRUE ANSWER : ?
YOUR ANSWER : ?

Use of excess of combustion air in the combustion of fuels results in

Condensation of water vapour from the fuel gas

Long flame

None of these

Heat losses

TRUE ANSWER : ?
YOUR ANSWER : ?