Question 21 : Percentage of methane in coke oven gas may be around
1. 5
2. 15
3. 25
4. 35
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Question 22 : Yield of pitch from distillation of high temperature tar is around __________ percent.
1. 10
2. 25
3. 65
4. 100
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Question 23 : The cooling medium used in dry quenching of coke is
1. nitrogen
2. air
3. phenolic water
4. carbon dioxide
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Question 24 : Out of the following fuels, the difference between the net and gross calorific value is maximum in case of
1. fuel oil
2. blast furnace gas
3. bituminous coal
4. pitch
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Question 25 : __________ prohibits the use of alcohols directly in petrol engines.
1. High cost & difficult availability
2. Low octane number
3. Low flash point
4. Low calorific value
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Question 26 : Proximate analysis of coal determines its __________ content.
1. moisture, ash, sulphur & volatile matter
2. moisture, volatile matter, ash & fixed carbon
3. moisture, sulphur, nitrogen & fixed carbon
4. none of the mentioned
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Question 27 : Which of the following has the highest calorific value?
1. Sub - bituminous
2. Anthracite
3. Lignite
4. Peat
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Question 28 : The decrease in the atomic number is not observed in case of
1. alpha emission
2. beta emission
3. gamma emission
4. none of the mentioned
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Question 29 : Pick out the wrong statement.
1. Regulation of furnace temperature and atmosphere (oxidising or reducing) is easily possible with pulverised fuel firing
2. Low grade coal can be used, but generally high volatile matter coals are more suitable for making pulverised fuel
3. Pulverised fuel can be completely burnt with less percentage of excess air compared to lump coal
4. None of the mentioned
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Question 30 : Which of the following petrographic constituents of coal is non-coking?
1. Durain
2. Vitrain
3. Clarain
4. Fussain
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