linearly

slowly first and then rapidly

rapidly first and then slowly

inversely

the given boiler with the model

the two different boilers of the same make

two different makes of boilers operat¬ing under the same operating conditions

any type of boilers operating under any conditions.

0.1 to 0.2 kg

0.2 to 0.4 kg

0.6 to 0.8 kg

1.0 to 1.5 kg

solid and vapour phases are in equilibrium

solid and liquid phases are in equilibrium

liquid and vapour phases are in equilibrium

solid, liquid and vapour phases are in equilibrium

air present in atmosphere at NTP conditions

air required for complete combustion of fuel with no excess air

air required for optimum combustion so as to have reasonable excess air

air required to convert CO into C02