Fuels and Combustion

61.Bituminous coal

1. Ignites less easily than anthracite
2. Is generally coking
3. Burns with smoky yellow flame
4. Both (B) and (C)

View answer

62.Blast furnace coke is made from coal by

1. Low temperature carbonisation
2. High temperature carbonisation
3. Medium temperature carbonisation
4. Heating the coal in an oven in presence of air

View answer

63.Blast furnace gas burns with a bluish flame, because of the presence of

1. CO
2. CH₄
3. CO₂
4. S

View answer

64.Blast furnace gas compared to coke oven gas has

1. Lower ignition temperature
2. Narrower limit of inflammability
3. Higher calorific value
4. Lower theoretical flame temperature

View answer

65.Blast furnace gas constitutes mainly of

1. N₂ & CH₄
2. N₂ & H₂
3. N₂ & CO
4. CH₄ & CO₂

View answer

66.Blast furnace gas is a very poisonous gas because of its predominantly high _________ content.

1. H₂O
2. CO₂
3. CO
4. CH₄

View answer

67.Bomb calorimeter can be used to determine the _________ of the coal.

1. Sulphur content
2. Calorific value
3. Both (A) & (B)
4. Neither (A) nor (B)

View answer

68.Bomb calorimeter is used for the determination of calorific value of the _________ fuels.

1. Gaseous
2. Solid
3. Liquid
4. Both (B) and (C)

View answer

69.Bomb calorimeter is used to determine the (where, GCV - Gross Calorific Value. NCV - Net Calorific Value.)

1. GCV at constant pressure
2. GCV at constant volume
3. NCV at constant pressure
4. NCV at constant volume

View answer

70.Bright coal

1. Contains more than 90% durain
2. Contains more than 90% fussain
3. Contains mainly vitrain & clarain and is generally coking
4. Is non-coking

View answer