Fuels And Combustion MCQ Questions & Answers | Chemical Engineering

A. Recarbonising steel

B. Making carbon electrodes

C. Blending with highly coking coal to check its swelling which helps in saving coke even walls from damage and to produce high strength coke

D. All of the above

A. Contains more volatile matter than bituminous coal

B. Ignites more easily than bituminous coal

C. Is essentially a coking coal

D. Burns with short, bluish, yellow-tipped flame producing very little smoke

A. Volatile matter content increases

B. Carbon content decreases

C. Moisture content increases

D. Ash content increases

A. H₂O

B. CO₂

C. CO

D. CH₄

A. Much lower

B. Much higher

C. Same

D. Either lower or higher, depends on the type of fuel

A. Less reactive

B. Stronger

C. Smaller in size

D. All of the above

A. 1

B. 15

C. 50

D. 100

A. Iron sulphate

B. Iron silicate

C. Lime and magnesia

D. All of the above

A. It is abrasive to the coal pulveriser (ie.g. ball mill) and the combustion chamber

B. The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace and causes its spalling due to different co-efficient of expansion/contraction of the refractory and the ash

C. The ash retains the sulphur & phosphorus and thus affects the quality of products in metallurgical furnace apart from increasing the slag volume. Besides, it may fuse and stick to the boiler tubes thereby reducing the heat transfer

D. All of the above

A. Plutonium

B. Uranium

C. Radium

D. Neptunium