1000+ Fuels and Combustion Objective Type Questions and Answers - 3

Question: 11

Function of secondary air in pulverised coal firing is to

(A) reduce primary air requirement

(B) ensure efficient burning of coal around the burner

(C) dry the coal

(D) transport the coal to the burner

Question: 12

In flue gas analysis by Orsat's apparatus, carbon dioxide is absorbed by

(A) alkaline pyrogallol solution

(B) cuporus chloride

(C) dilute potassium carbonate

(D) potassium hydroxide

Question: 13

Fuel can be defined as substance which produces heat by

(A) nuclear fusion

(B) nuclear fission

(C) combustion

(D) all a, b and c

Question: 14

Furnace wall heat loss does not depend on the

(A) material of stock to be heated

(B) thermal conductivity of wall brick

(C) velocity of air around the furnace

(D) temperature of external wall surface

Question: 15

High percentage of carbon monoxide presence in the flue gas of boiler is an indicator of

(A) complete combustion

(B) good control of pollutants

(C) high excess air

(D) low excess air