1000+ Fuels and Combustion Online Test Questions & Answers - 3

Question: 11

For coal fired system, flame length is dictated by

(A) ash content

(B) moisture

(C) fixed carbon

(D) volatile matter

Question: 12

The maximum adiabatic flame temperature is attained, when the fuel is burnt with

(A) theoretically required amount of oxygen

(B) less than theoretically required amount of air

(C) more than theoretically required amount of air

(D) theoretically required amount of air

Question: 13

Which of the following fuel gases is heavier than air?

(A) water gas

(B) natural gas

(C) blast furnace gas

(D) coke oven gas

Question: 14

Purity of coke means that, it is high in carbon and low in

(A) moisture

(B) ash

(C) iron

(D) volatiles

Question: 15

A sooty flame can be made non luminous by

(A) admitting more air

(B) shutting air supply

(C) admitting more gas

(D) shutting gas supply