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Fuels and Combustion

Fuels and Combustion
Pensky-Marten apparatus is used for those oils, whose flash points are __________ °F.

>120
90-110

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Fuels and Combustion
A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the 'carpet loss'. The carpet loss may be of the order of __________ cms.

3 to 4
5 to 15
1 to 2
20 to 40

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Fuels and Combustion
For long flame and easy ignition, the coal used should have

High volatile matter
Low ash
High ash
High calorific value

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Fuels and Combustion
Naphthalene is used for making

Unsaturated polyesters
All of these
Insecticides (e.g. moth balls)
Drug intermediates e.g. β-naphthol

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Fuels and Combustion
The main function of primary air in pulverised coal fired burner is to

Preheat the tertiary air used for complete combustion of CO to CO₂
Have proper combustion by supplying it around the burner
Dry and transport the coal
Burn CO to CO₂

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

Coal can be easily pulverised
Coal can't be pulverised
Power consumption in grinding the coal will be very high
Coal can be pulverised with great difficulty

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