Question 81 : One of the disadvantages of a solid fuel is:
1. clinker formation
2. moderate ignition temperature
3. storage
4. transportation
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Question 82 : Which of the following fraction obtained on distillation used in dry cleaning?
1. petroleum ether
2. heavy oil
3. gas oil
4. naphtha
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Question 83 : Calculate the HCV and NCV of the coal for the following data.Weight of the coal=0.8gWater equivalent of calorimeter=460gWeight of the water=2600gRise in temperature=2.42^oCCooling corrections=0.052^oCFuse wire corrections=10 caloriesH=6% and assume latent heat of steam=600cal/g.
1. 9131.4cal/g
2. 9113.6cal/g
3. 9800cal/g
4. 9220cal/g
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Question 84 : Alcohol can absorb ______
1. traces of water
2. traces of impurities
3. traces of dust
4. traces of carbon
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Question 85 : To improve anti knock of diesel _____ are added.
1. TEL
2. Pre-ignition dopes
3. Di ethyl telluride
4. N-hexa decane
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Question 86 : C=70%, O=10%, N=1%, S=5% and ash=4%.The NCV of the fuel was found to be 9210cal/g. percentage of hydrogen be x and HCV of the fuel be y. Find out y/x.
1. 747.7
2. 768
3. 777
4. 676.9
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Question 87 : Removal of water is done by______
1. Orsteds process
2. Kjeldahl's process
3. Filtration
4. Cottrells process
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Question 88 : The flame colour of the aromatic compounds is ________
1. yellow
2. orange
3. green
4. pink
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Question 89 : One of the advantages of a solid fuel is ______
1. low calorific value
2. requirement of excess air
3. ash formation
4. ease of transport
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Question 90 : To calculate HCV of the fuel, the products of combustion are cooled down to _____
1. 600F
2. 700F
3. 400F
4. 200F
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