Question 31 : In flue gas analysis by Orsat's apparatus, carbon dioxide is absorbed by
1. cuporus chloride
2. dilute potassium carbonate
3. potassium hydroxide
4. alkaline pyragllol solution
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Question 32 : Caking index of the coal blend used for the manufacture of metallurgical coke should be around
1. 5
2. 40
3. 21
4. 48
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Question 33 : Which law deals with the rate of diffusion of Oxygen per unit surface area of the particle?
1. Kirchhoff's Law
2. Plank's Law
3. Fourier's Law
4. Fick's Law
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Question 34 : High amount of sulphur and phosphorous in coke causes
1. increase in its strength
2. decrease in its calorific value
3. brittleness of steel made by using it
4. none of the mentioned
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Question 35 : Initial pressure of oxygen introduced into the 'bomb' of the bomb calorimeter for determination of calorific value of coal/fuel oil may be around __________ atm.
1. 20-30
2. 60-65
3. 95-100
4. 3-5
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Question 36 : Abrasion index of blast furnace coke should be around __________ percent.
1. 20
2. 35
3. 80
4. 55
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Question 37 : If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be
1. very high, if the fuel is of low calorific value
2. low
3. high
4. none of the mentioned
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Question 38 : 'Overfire burning' in a furnace is a phenomenon characterised by the
1. burning of carbon monoxide and other incombustibles in upper zone of furnace by supplying more air
2. supply of excess fuel
3. supply of excess air
4. none of the mentioned
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Question 39 : __________ present in coal is not determined in its ultimate analysis.
1. Fixed Carbon
2. Total Carbon
3. Nitrogen
4. Hydrogen
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Question 40 : Combustion of pulverised coal as compared to that of lump coal
1. develops a non-luminous flame
2. can be done with less excess air
3. develops a low temperature flame
4. provides a lower rate of heat release
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