Fuels and Combustion
Artificial draught produced by a fan can be controlled by the

Damper
Variation in the pitch of the fan blades
All of these
Speed of the fan

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Fuels and Combustion
Orsat apparatus is meant for

Finding out combustion efficiency
None of these
Gravimetric analysis of flue gas
Direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride

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