Question 21 : Presence of ______________ in dry gaseous fuel does not contribute its calorific value.
1. hydrogen
2. sulphur
3. oxygen
4. carbon
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Question 22 : The design of steam generator greatly depends on
1. spontaneous combustion
2. sulphur content
3. ash softening temperature
4. heating value
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Question 23 : In pure oxygen, the maximum flame temperature is
1. higher than the theoretical flame temperature
2. lower than the theoretical flame temperature
3. equal to the theoretical flame temperature
4. none of the mentioned
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Question 24 : What are the first products in Fischer-Tropsch process?
1. CO+H₂
2. CO₂ +H₂
3. Coke + H₂O
4. Coke
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Question 25 : Dry air required to burn 1kg of carbon completely may be around ________________ kg.
1. 11
2. 38
3. 2
4. 20
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Question 26 : Which of these accentuates clinkering trouble on furnace grate burning coal?
1. low reactivity of carbonised residue containing high proportions of iron and sulphur
2. low forced draught and low fuel bed temperature
3. thick fire bed and preheated primary air
4. all of the mentioned
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Question 27 : Grindability index of a coal is 100. It implies that the
1. coal can be easily pulverised
2. coal can be pulverised with great difficulty
3. coal can't be pulverised
4. power consumption in grinding the coal will be very high
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Question 28 : Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively __________ percent.
1. 10 & 3
2. 3 & 10
3. 15 & 8
4. 10 & 20
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Question 29 : Which of these is a product of pyrolysis process in dry thermochemical conversion?
1. methane
2. methanol
3. ammonia
4. pyrolytic oils
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Question 30 : 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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