Question 41 : For exothermic reactions, free energy change is?
1. positive
2. negative
3. zero
4. none of the mentioned
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Question 42 : If the enthalpy change for a reaction is zero, ΔG° is equal to
1. TΔS°
2. -TΔS°
3. -ΔH°
4. lnKeq
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Question 43 : Combustion of pulverised coal as compared to lump coal
1. can be done with less excess air
2. develops a low temperature flame
3. develops a non-luminous flames
4. provides a lower rate of heat release
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Question 44 : Which of these is an important measure of performance in for a power plant?
1. NPHR
2. AP
3. NTO
4. HHV
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Question 45 : Which of the following type of fuel does not contain ash?
1. coal
2. fuel oil
3. natural gas
4. synthetic fuels
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Question 46 : Stack heat losses can be minimised by
1. using low c.v. fuels
2. controlling the excess air
3. oxygen enrichment of combustion air
4. maintaining proper draft in the furnace
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Question 47 : Which of these gases is the reason for the maintenance of natural gas at cryogenic temperatures?
1. methane
2. ethane
3. propane
4. benzene
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Question 48 : The heat transferred when the H₂O in the products is in the liquid state is called?
1. HCV
2. LCV
3. LHV
4. None of the mentioned
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Question 49 : Grindability of coal is 100. It implies that
1. it can't be pulverised
2. it is easily pulverised
3. can be pulverised with difficulty
4. power consumption is high in pulverisation
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Question 50 : Natural draught produced by a chimney depends upon
1. density of chimney gases
2. height of chimney
3. both 'a' and 'b'
4. none of the mentioned
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