FUELS AND COMBUSTION QUIZ

Coal tar fuels (CTF) as compared to petroleum based fuel oils have higher

Difference in gross & net calorific value

Sulphur content

Higher C/H ratio

Calorific value

TRUE ANSWER : ?
YOUR ANSWER : ?

With increase in C/H ratio of a fuel, the dew point of flue gases

Remains same

Decreases

Increases

May increase or decrease ; depends on the type of fuel

TRUE ANSWER : ?
YOUR ANSWER : ?

Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt 'using theoretical amount of air in

Either A or B

Either A or C without gain or loss of heat

Air

Oxygen

TRUE ANSWER : ?
YOUR ANSWER : ?

Fussain

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

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

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Stack (chimney) height in a big thermal power plant is dictated by the

Draught to be created

Limitation of constructional facilities

None of these

Pollution control aspect

TRUE ANSWER : ?
YOUR ANSWER : ?

Calorific value of coke even gas produced by low temperature carbonisation of coal is about __________ Kcal/Nm³.

4000

6500

2500

10000

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following gaseous fuels is likely to have the highest gross calorific value?

Producer gas

LPG

Sewage gas

Natural gas

TRUE ANSWER : ?
YOUR ANSWER : ?

Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively __________ percent.

10 & 20

3 & 10

15 & 8

10 & 3

TRUE ANSWER : ?
YOUR ANSWER : ?

__________ prohibits the use of alcohols directly in petrol engines.

Low octane number

Low calorific value

Low flash point

High cost & availability

TRUE ANSWER : ?
YOUR ANSWER : ?

Caking coal is desirable for

Coke making

All of these

Burning on firebars

Burning on travelling grate

TRUE ANSWER : ?
YOUR ANSWER : ?