Fuels and Combustion

71.Bulk density of pulverised coal may be about _________ kg/m³.

1. 100
2. 500
3. 1000
4. 1500

View answer

72.Bunsen burner is an example of a/an _________ burner.

1. Inside mixing/premix type
2. Outside mixing/diffusion flame/nozzle mix type
3. Rotary cup
4. Submerged combustion

View answer

73.By-products are _________ recovered in 'Beehive ovens'.

1. Fully
2. Partially
3. Not at all
4. Negligibly

View answer

74.By-products recovery process from coal carbonisation is termed as direct, indirect and semi direct process depending upon the method of recovery of

1. Tar
2. Benzol
3. Ammonia
4. None of these

View answer

75.C.V. (kcal/Nm³) of gaseous fuels _________ with increase in molecular weight.

1. Decreases
2. Increases
3. Remain constant
4. May increase or decrease, depends on combustibles

View answer

76.C/H ratio is the maximum in case of

1. Coal
2. Furnace oil
3. Natural gas
4. Naphtha

View answer

77.C/H ratio is the minimum in case of

1. Furnace oil
2. Natural gas
3. Coal
4. Naphtha

View answer

78.Caking coal is desirable for

1. Burning on travelling grate
2. Coke making
3. Burning on firebars
4. All (A), (B) and (C)

View answer

79.Caking index of a coal is a measure of its

1. Abradability
2. Reactivity
3. Agglutinating (binding) properties
4. Porosity

View answer

80.Caking index of coal blend used for blast furnace coke making is about

1. 8
2. 12
3. 22
4. 36

View answer