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Fuels and Combustion on Chemistry related Questions and Answers - Page 8

Question 71 : Out of the following fuels, the difference between the net and gross calorific value is maximum in case of
1. fuel oil
2. pitch
3. bituminous coal
4. blast furnace gas
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Question 72 : Higher fuel combustion efficiency can not be achieved by
1. reducing sulphur content in the fuel.
2. adopting proper fuel firing technique & fuel preparation.
3. supplying correct amount of combustion air.
4. preheating of fuel gases & combustion air.
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Question 73 : Height of coke oven is limited (say maximum upto 7 metres) mainly by the
1. problem of uniform heating along its height.
2. structural strength of silica bricks.
3. problem in door cleaning.
4. buckling of ram of pusher car at the time of coke pushing.
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Question 74 : Which of the following is the maximum coal producing state in India ?
1. Jharkhand
2. Orissa
3. Assam
4. West Bengal
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Question 75 : __________ prohibits the use of alcohols directly in petrol engines.
1. Low octane number
2. High cost & availability
3. Low flash point
4. Low calorific value
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Question 76 : Which of the following has the highest calorific value ?
1. Anthracite
2. Sub-bituminous coal
3. Lignite
4. Peat
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Question 77 : Cannel coal and boghead coal are the examples of
1. sapropelic coals
2. humic coals
3. liptobiolites
4. none of these
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Question 78 : Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively __________ percent.
1. 3 & 10
2. 10 & 3
3. 15 & 8
4. 10 & 20
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Question 79 : __________ present in coal is not determined in its ultimate analysis.
1. Fixed carbon
2. Hydrogen
3. Nitrogen
4. Total carbon
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