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.Management Sciences
Category: Fuels and Combustion
Which of the following fuels has the highest calorific value per unit mass (kcal/kg) ?
A. Coal
B. Kerosene
C. Natural gas
D. Furnace oil
Cannel coal__________________?
A. Is non-coking
B. Has a high volatile matter content and burns with a luminous smoky flame
C. Is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is
so named
D. All A., B. and C.
With increases in carbonisation temperature_______________________?
A. Coke even gas yield increases
B. Tar yield increases
C. Hydrogen percentage in the coke oven gas decreases
D. Methane percentage in the coke oven gas increases
Cannel coal and boghead coal are the examples of _________________?
A. Humic coals
B. Liptobiolites
C. Sapropelic coals
D. None of these
Dust content in raw blast furnace gas is about _______________ gm/Nm3; hence it is cleaned to the dust level of about < 10 mg /Nm3 before use?
A. 15-30
B. 1-2
C. 70-100
D. 150-200
‘Fuel’ can be defined as a substance which produces heat by___________________?
A. Combustion
B. Nuclear fission
C. Nuclear fusion
D. All A., B. & C.
Which of the following has the highest calorific value ?
A. Lignite
B. Sub-bituminous coal
C. Anthracite
D. Peat
Fossil fuels mean___________________?
A. Solid fuels
B. Liquid fuels
C. Those fuels which are found in the crust of earth
D. Premature fuels with low calorific value
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