Question 1 : Gross & net calorific value is the same for
1. blast furnace gas
2. coke oven gas
3. none of these
4. L.D. converter gas
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Question 2 : Ratio of primary air to secondary air increases with increase in the rank of coal, because the
1. calorific value of the coal increases.
2. high rank coals have higher amount of volatile matter.
3. oxygen content progressively decreases.
4. ratio of fixed carbon to volatile matter increases.
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Question 3 : Stack heat losses can be minimised by
1. oxygen enrichment of combustion air.
2. controlling the excess air.
3. using low c.v. fuels.
4. maintaining proper draft in the furnace.
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Question 4 : Carbon Content by weight in air dried wood may be about __________ percent.
1. 80
2. 25
3. 10
4. 50
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Question 5 : Higher percentage of ash in coal meant for the production of metallurgical grade coke
1. decreases the hardness of coke.
2. causes brittleness in steel.
3. none of these.
4. decreases the abrasion resistance of coke.
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Question 6 : A coal containing very high percentage of durain is called __________ coal.
1. bright
2. boghead
3. non-banded
4. splint
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Question 7 : Laboratory gas is obtained by the cracking of
1. fuel oil
2. diesel
3. gasoline
4. kerosene
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Question 8 : Which of the following constituents of coal is the most important in the production of coke?
1. Carbon
2. Volatiles
3. Moisture
4. ash
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Question 9 : Which of the following is not a product of tar distillation ?
1. Benzol & pitch
2. Anthracene & creosote
3. None of these
4. Phenol & naphthalene
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Question 10 : Junker's calorimeter is used to determine the calorific value of
1. gaseous fuels
2. fuel oil
3. pulverised coal
4. none of these
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