Calorific value of blast furnace gas is around _____________ KCal/Nm3?

A. 850
B. 1800
C. 4200
D. 6500

Which of the following would require least amount of secondary air for combustion ?

A. Coke breeze containing 25% ash and 2% volatile matter
B. Anthracite containing 10% volatile matter and 8% ash
C. Bituminous coal containing 20% ash and 25% volatile matter
D. Semi-bituminous coal containing 25% ash and 20% volatile matter

Bulk density of pulverised coal may be about ______________ kg/m3?

A. 100
B. 500
C. 1000
D. 1500

Bunsen burner is an example of a/an _____________ burner?

A. Inside mixing/premix type
B. Outside mixing/diffusion flame/nozzle mix type
C. Rotary cup
D. Submerged combustion

The main drawback of supplying more excess air in the combustion of fuel is the_________________?

A. Excessive power requirement of air blower
B. Enhanced sensible heat loss in the flue gas
C. Intermittent and uncontrolled combustion of the fuel
D. High exit flue gas temperature from the furnace

The maximum adiabatic flame temperature in air is _____________ the maximum flame temperature in pure oxygen?

A. Lower than
B. Higher than
C. Same as
D. Not related to

Largest constituent of coke oven gas is_________________?

A. N2
B. H2
C. CH4
D. CO2

Bomb calorimeter can be used to determine the _____________ of the coal?

A. Sulphur content
B. Calorific value
C. Both A. & B.
D. Neither A. nor B.

A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be_________________?

A. More
B. Less
C. Same
D. Data insufficient; can’t be predicted

Combustion reaction of fuels is a/an ______________ reaction?

A. Auto catalytic
B. Exothermic
C. Endothermic
D. None of these