FUELS AND COMBUSTION QUIZ

In flue gas analysis by Orsat's apparatus, oxygen is absorbed by

Cuprous chloride

None of these

Potassium hydroxide

Alkaline pyragllol solution

TRUE ANSWER : ?
YOUR ANSWER : ?

High sulphur content in a fuel __________ of the flue gases.

Decreases the dew point

Both B & C

Reduces the combustion efficiency by limiting the permissible temperature reduction

Increases the dew point

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following fuel gases is heavier than air?

Natural gas

Coke oven gas

Blast furnace gas

Water gas

TRUE ANSWER : ?
YOUR ANSWER : ?

Octane number of 2, 2, 4 - trimethyl pen-tane is

More than 100

100

In between 0 and 100

TRUE ANSWER : ?
YOUR ANSWER : ?

Yield of pitch from distillation of high temperature tar is around __________ percent.

65

10

90

25

TRUE ANSWER : ?
YOUR ANSWER : ?

In high temperature carbonisation (as compared to low temperature carbonisation) of coal

All of these

Calorific value of coke oven gas is less

Coke oven gas yield is more

Tar yield is less but free carbon in tar is more

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 ?

Hydrocyclones

Wet scrubber

Bag filter

Multicyclones

TRUE ANSWER : ?
YOUR ANSWER : ?

__________ of the coal is the basis for Seylor's coal classification.

Proximate analysis

Calorific value

Ultimate analysis

Caking index

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing?

High power consumption in its transportation

Ash disposal problem

Erosion of induced draft fan blades

Excessive fly-ash discharge from the stack

TRUE ANSWER : ?
YOUR ANSWER : ?

By-products recovery process from coal carbonisation is termed as direct, indirect and semi direct process depending upon the method of recovery of

Ammonia

None of these

Benzol

Tar

TRUE ANSWER : ?
YOUR ANSWER : ?

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