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Fuels and Combustion

Fuels and Combustion
Dry air required to burn 1 kg of carbon completely may be around __________ kg.

2
38
11
20

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Fuels and Combustion
Highly reactive coke have lower

Porosity
Both B and C
Critical air blast (CAB) value
Coke reactivity index (CRI)

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Fuels and Combustion
The main reason for making the copper calorimeter (used in bomb calorimeter) silvery white and shining/polished is to

None of these
Avoid radiation heat loss
Make it look attractive
Minimise its corrosion

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Fuels and Combustion
Short/intense flame is produced during combustion of gaseous fuel by using

Very little excess air
High amount/current of combustion air
Low amount/current of combustion air
Preheated secondary air

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Fuels and Combustion
Coal is pulverised before burning in large capacity boiler furnaces mainly to

Provide trouble free operation
Enhance its calorific value
Facilitate easy ash removal
Ensure its complete combustion

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Fuels and Combustion
Which of the following constituents of coal is the most important in the production of coke?

Carbon
Moisture
Ash
Volatiles

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