Question 1 : The difference between the enthalpy of products & the enthalpy of reactants when complete combustion occurs at specific temperature & pressure is called?
1. Enthalpy of burning
2. Enthalpy of Combustion
3. Enthalpy of complete combustion
4. None of the mentioned
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Question 2 : High amount of sulphur and phosphorous in coke causes
1. decrease in its calorific value
2. increase in its strength
3. brittleness of steel made by using it
4. none of the mentioned
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Question 3 : Higher efficiency in combustion of solid fuel cannot be achieved by
1. keeping flue gas temperature very high
2. proper fuel preparation
3. supplying correct quantity of combustion air
4. adopting efficient fuel-firing technique and equipment
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Question 4 : The draught or pressure difference for a chimney of height of H metres is given by
1. Δp=gH(ρa-ρg)
2. Δp=gH(ρg-ρa)c) Δp=gHρgd) Δp=gH(ρa+ρg)
3.
4.
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Question 5 : Fuel gases containing hydrocarbons are not preheated before burning, because
1. they crack, thereby choking and fouling heat transfer surface
2. it reduces calorific value tremendously
3. it reduces flame temperature tremendously
4. there are chances of explosion during preheating
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Question 6 : The gas which contributes maximum to heating value of natural gas is
1. CO
2. CO₂
3. H₂
4. CH₄
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Question 7 : Maximum Theoretical Flame Temperature corresponds to?
1. Partial Combustion
2. Incomplete Combustion
3. Complete combustion
4. None of the mentioned
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Question 8 : Dissociation is directly proportional to temperature.
1. True
2. False
3.
4.
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Question 9 : Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.
1. 1000
2. 4000
3. 6000
4. 8000
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Question 10 : Carbon content by weight in air dried wood may be about _____________ %.
1. 25
2. 50
3. 10
4. 80
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