Question 61 : Higher percentage of ash in coal meant for the production of metallurgical grade coke
1. causes brittleness in coke
2. increases abrasion resistance of coke
3. decreases hardness of coke
4. causes high toughness
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Question 62 : HCV stands for?
1. Higher Combustion Value
2. Higher Convection Value
3. Higher Calorific Value
4. Higher Calorific Value
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Question 63 : The free energy of chemical elements at 1 atm & 25H^oC is assumed to be?
1. Negative
2. Positive
3. Zero
4. None of the mentioned
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Question 64 : Laboratory gas is obtained by cracking of
1. fuel oil
2. gasoline
3. kerosene
4. diesel
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Question 65 : Which of these is not a reason for reduction in maximum flame temperature in actuality?
1. incomplete combustion
2. heat loss to exhaust gases
3. excess air requirements
4. heat loss to surroundings
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Question 66 : Which of these properties specifies the minimum temperature at which fuel oil can be ignited?
1. pour point
2. flash point
3. heating value
4. viscosity
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Question 67 : The difference in total carbon and fixed carbon of coal will be minimum in case of
1. lignite
2. bituminous coal
3. high temperature coke
4. anthracite
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Question 68 : Which of the following is not considered a type of coal according to ASTM?
1. anthracite
2. bituminous
3. peat
4. lignite
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Question 69 : Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec
1. 0.5
2. 500
3. 10
4. 50
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Question 70 : Bomb calorimeter is used determine the calorific value of
1. solid fuels
2. liquid fuels
3. both 'a' and 'b'
4. none of the mentioned
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