Question 41 : Main constituents of benzol are
1. benzene, toluene & xylene
2. tar & creosote
3. ammonia & phenol
4. anthracene & phenol
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Question 42 : Which of the following is the maximum coal producing state in India?
1. Orissa
2. West Bengal
3. Jharkhand
4. Assam
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Question 43 : Coking time in beehive coke oven is about
1. one week
2. 12 hours
3. 2-3 days
4. 2 weeks
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Question 44 : The difference between total carbon and fixed carbon of coal will be minimum in case of
1. anthracite
2. lignite
3. bituminous
4. high temperature coke (V.M < 0.5%)
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Question 45 : A good quality coal should have
1. low fusion point of ash
2. high sulphur
3. high ash content
4. none of the mentioned
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Question 46 : The heat of combustion of a fuel
1. is equal to the heat of formation
2. is always negative
3. can't be known without calculating it
4. is always positive
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Question 47 : If d is the diffusion coefficient and t is the boundary layer thickness. Then the mass transfer coefficient k is given by?
1. k = d x t
2. k = d / t
3. k = d + t
4. k = d - t
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Question 48 : Oxygen percentage (by weight) in atmospheric air is
1. 22
2. 20
3. 19
4. 21
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Question 49 : The maximum adiabatic flame temperature is attained, when the fuel is burnt with
1. theoretically required amount of air.
2. less than theoretically required amount of air.
3. more than theoretically required amount of air.
4. theoretically required amount of oxygen
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Question 50 : Cannel coal and boghead coal are the examples of
1. liptobiolites
2. humic coals
3. sapropelic coals
4. none of the mentioned
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