FUELS AND COMBUSTION QUIZ

Hard coke is manufactured from

Semi-anthracite

Lignite

Bituminous coal

Anthracite

TRUE ANSWER : ?
YOUR ANSWER : ?

Spontaneous combustion of coal on storage results due to

All of these

Low temperature oxidation

Storage in large heaps with small surface to volume ratio

Inadequate ventilation

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of free moisture in coal is most disadvantageous during

None of these

Combustion of fire slacks on the grates

Handling (e.g. when emptying wagons)

Its pulverisation (as it requires more power)

TRUE ANSWER : ?
YOUR ANSWER : ?

Quantity of coke produced from metallurgical coal may be around __________ percent.

30

75

95

50

TRUE ANSWER : ?
YOUR ANSWER : ?

Grindability index of a coal is 100. It implies that the

Coal can't be pulverised

Coal can be pulverised with great difficulty

Coal can be easily pulverised

Power consumption in grinding the coal will be very high

TRUE ANSWER : ?
YOUR ANSWER : ?

The fuel ratio of a coal is

Helpful in estimation of its rank

Both A and B

Neither A nor B

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

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is the maximum coal producing state in India?

Assam

Orissa

Jharkhand

West Bengal

TRUE ANSWER : ?
YOUR ANSWER : ?

Natural draught produced by a chimney depends upon the

Height of the chimney

Density of the chimney gases

Both A & B

Neither A nor B

TRUE ANSWER : ?
YOUR ANSWER : ?

In low temperature carbonisation of coal, the

Yield of tar is about 3% of dry coal

Yield of coke oven gas is 290 Nm³ /ton dry coal

Volatile matter in coke is zero

Temperature maintained is 700°C

TRUE ANSWER : ?
YOUR ANSWER : ?

The function of secondary combustion air is to

Burn the lumpy coal

Completely burn the volatile matter

Pneumatically convey the pulverised coal

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?