Question 61 : Gobar gas is produced by the __________ of 'gobar' (cow dung).
1. oxidation
2. fermentation
3. hydrolysis
4. dehydration
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Question 62 : The difference between total carbon and fixed carbon of coal will be minimum in case of
1. high temperature coke (V.M < 0.5%)
2. anthracite
3. lignite
4. bituminous coal
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Question 63 : A particular coal is said to be free burning when it
1. burns completely.
2. none of these.
3. gives smokeless burning.
4. shows little or no fusing action.
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Question 64 : The cooling medium used in dry quenching of coke is
1. phenolic water
2. air
3. carbon dioxide
4. nitrogen
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Question 65 : High amount of sulphur and phosphorous in coke causes
1. brittleness of steel made by using it.
2. decrease in its calorific value.
3. none of these.
4. increase in its strength.
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Question 66 : The maximum adiabatic flame temperature is attained, when the fuel is burnt with
1. theoretically required amount of air.
2. more than theoretically required amount of air.
3. theoretically required amount of oxygen.
4. less than theoretically required amount of air.
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Question 67 : Bunsen burner is an example of a/an __________ burner.
1. outside mixing/diffusion flame/nozzle mix type.
2. inside mixing/premix type
3. rotary cup.
4. submerged combustion.
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Question 68 : The hottest part of the flame lies in its____zone.
1. non-luminous
2. yellow
3. unburnt gases
4. luminous
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Question 69 : Grindability index of a coal is 100. It implies that the
1. coal can be pulverised with great difficulty.
2. power consumption in grinding the coal will be very high.
3. coal can't be pulverised.
4. coal can be easily pulverised.
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Question 70 : A good quality coal should have
1. low fusion point of ash
2. none of these
3. high sulphur
4. high ash content
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