FUELS AND COMBUSTION QUIZ

The fuel ratio of a coal is

Helpful in estimation of its rank

Neither A nor B

Both A and B

The ratio of its percentage of fixed carbon to that of volatile matter

TRUE ANSWER : ?
YOUR ANSWER : ?

Gobar gas is produced by the __________ of 'gobar' (cow dung).

Oxidation

Fermentation

Hydrolysis

Dehydration

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Both B & C

Reduces the combustion efficiency by limiting the permissible temperature reduction

Decreases the dew point

Increases the dew point

TRUE ANSWER : ?
YOUR ANSWER : ?

The function of secondary combustion air is to

None of these

Burn the lumpy coal

Pneumatically convey the pulverised coal

Completely burn the volatile matter

TRUE ANSWER : ?
YOUR ANSWER : ?

Carbon Content by weight in air dried wood may be about __________ percent.

10

80

25

50

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Heat losses

Long flame

Condensation of water vapour from the fuel gas

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Washing of coal decreases its

Mineral matter content

Both B and C

Ash content

Caking index

TRUE ANSWER : ?
YOUR ANSWER : ?

Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about____°C.

85

105

70

145

TRUE ANSWER : ?
YOUR ANSWER : ?

(64-132) rank coal (ASTM) means a coal with 64%

None of these

Fixed carbon and having a heat value of 13, 200 BTU/1b

Ash and a heating value of 13, 200 BTU/1b

Fixed carbon and a heating value of 132 BTU/1b

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Carburetted water gas

Producer gas

Natural gas

Liquified petroleum gas

TRUE ANSWER : ?
YOUR ANSWER : ?