Question 1 : Height of coke oven is limited (say maximum up to 7 metres) mainly by the
1. problem of uniform heating along its height.
2. structural strength of silica bricks
3. problem in door cleaning
4. buckling of ram of pusher car at the time of coke pushing
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Question 2 : Which of these is the outer most coating in the burning of a coke particle?
1. Oxygen
2. Carbon monoxide
3. Carbon dioxide
4. Ash Layer
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Question 3 : The hottest part of the flame lies in its ____ zone.
1. non-luminous
2. luminous
3. yellow
4. unburnt gases
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Question 4 : Presence of free moisture in coal is most disadvantageous during
1. combustion of fire slacks on the grates
2. its pulverisation
3. handling (e.g. when emptying wagons)
4. none of the mentioned
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Question 5 : A particular coal is said to be free burning when it
1. gives smokeless burning
2. shows little or no fusing action
3. burns completely
4. none of the mentioned
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Question 6 : Higher fuel combustion efficiency cannot be achieved by
1. preheating of fuel gases & combustion air
2. supplying correct amount of combustion air
3. reducing sulphur content in the fuel
4. adopting proper fuel firing technique & fuel preparation
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Question 7 : 'Fat' coal means a coal having
1. low ash content
2. non-smoking tendency
3. high volatile matter
4. low calorific value
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Question 8 : Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.
1. 1000
2. 4000
3. 6000
4. 8000
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Question 9 : Atomising steam to fuel oil ratio in a burner should be around
1. 0.5
2. 1.5
3. 2.5
4. 3.5
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Question 10 : With increase in moisture content of coal, its
1. calorific value increases sometimes
2. bulk density always decreases
3. clinkering tendency during combustion increases
4. none of the mentioned
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