In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of__________________?

Caking index of a coal is a measure of its _______________________?

A. Abradability

B. Reactivity

C. Agglutinating (binding) properties

D. Porosity

Main component of sewage gas produced during anaerobic decomposition of organic waste (by suitable bacteria) during sewage disposal is __________________?

A. H2

B. CH4

C. CO2

D. N2

The shift conversion reaction taking place during water gas manufacture is given by__________________?

A. C + H2O ↔ CO + H2

B. C + 2H2O ↔ CO2 + 2H2

C. CO + H2O ↔ CO2 + H2

D. None of these

_____________ of the coal is the basis for Seylor’s coal classification?

A. Proximate analysis

B. Ultimate analysis

C. Caking index

D. Calorific value

In flue gas analysis by Orsat’s apparatus, carbon monoxide is absorbed by__________________?

A. Cuprous chloride

B. Potassium hydroxide

C. Alkaline pyrogallol solution

D. None of these