FUELS AND COMBUSTION QUIZ

Calorific value of both the solid & liquid fuels can be determined by using __________ calorimeter.

None of these

Boy's

Bomb

Junker's

TRUE ANSWER : ?
YOUR ANSWER : ?

Ash content in the middling coal (a byproduct of coal washeries) in India ranges between __________ percent.

75

15 to 25

35 to 45

55 to 75

TRUE ANSWER : ?
YOUR ANSWER : ?

Fuel combustion is never cent per cent efficient due to

Dry gas/stack gas loss

Moisture loss

Incomplete combustion

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Largest constituent of coke oven gas is

H₂

CO₂

CH₄

N₂

TRUE ANSWER : ?
YOUR ANSWER : ?

Calorific values of both the solid as well as the liquid fuels can be determined by __________ calorimeter.

Boy's

None of these

Bomb

Junkar's

TRUE ANSWER : ?
YOUR ANSWER : ?

Stack heat losses can be minimised by

Oxygen enrichment of combustion air

Maintaining proper draft in the furnace

Controlling the excess air

Using low c.v. fuels

TRUE ANSWER : ?
YOUR ANSWER : ?

Orsat apparatus

Gives flue gas analysis on dry basis

Determines N₂ in flue gas indirectly

Can

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature?

Calorific value of the fuel

Heat transfer rate to the stock in the furnace

Speed of combustion of fuel

Flame temperature achieved

TRUE ANSWER : ?
YOUR ANSWER : ?

Producer gas containing least amount of tar is produced by the

Partial combustion of large size (< 50 mm) coke

High pressure gasification of coal (e.g. in Lurgi gasifier)

Partial combustion of coal

Atmospheric pressure gasification of coal (e.g., in Kopper-Totzek gasifier)

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Grindability

Caking and swelling properties

Weathering properties

Abradability

TRUE ANSWER : ?
YOUR ANSWER : ?

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