FUELS AND COMBUSTION QUIZ

__________ prohibits the use of alcohols directly in petrol engines.

High cost & availability

Low calorific value

Low flash point

Low octane number

TRUE ANSWER : ?
YOUR ANSWER : ?

In general, the limit of inflammability/explosion limit of fuel gases is widened by the

Increase in gas pressure

Increase in temperature (i.e. preheating)

All of these

Use of pure oxygen for combustion instead of air

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of phosphorous in metallurgical coal

Badly affects the quality of steel

Increases its caking power

Reduces its calorific value

Is not undersirable

TRUE ANSWER : ?
YOUR ANSWER : ?

Combustion of pulverised coal compared to the lumpy coal

Provides better control of furnace temperature

Facilitates combustion with lower excess air

All of these

Provides higher thermal efficiency & flame temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

A coal having higher volatile matter content, has lower

Smoking tendency on burning

Ignition temperature

Coke oven gas yield on carbonisation

Chance of catching fire during storage in open space

TRUE ANSWER : ?
YOUR ANSWER : ?

Calorific value of

Light paraffinic fuel oils is higher than that of equivalent olefins

N-paraffin is lower than that of iso-paraffins of the same compounds

Light paraffinic fuel oils is lower than that of equivalent olefins

Light paraffinic fuel oils is equal to that of equivalent olefins

TRUE ANSWER : ?
YOUR ANSWER : ?

Ammonia content in raw coke oven gas is about __________ gm/Nm³.

50

15

100

1

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following has the highest calorific value (kcal/Nm³) ?

Gobar gas

Natural gas

LPG

Carburetted water gas

TRUE ANSWER : ?
YOUR ANSWER : ?

Coals used for the generation of producer gas should have

High caking index

High volatile matter content

Very low ash content (8-10%)

Low fusion point of ash

TRUE ANSWER : ?
YOUR ANSWER : ?

Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm³ /ton of dry coal.

60

500

750

160

TRUE ANSWER : ?
YOUR ANSWER : ?