Fuels And Combustion MCQ Questions & Answers

41

Anthracite can be used for

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

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Answer & Solution

Answer: Option D

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42

Anthracite coal

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

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Answer & Solution

Answer: Option D

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43

Ignition temperature decreases progressively from anthracite to lignite, because

A) Volatile matter content increases B) Carbon content decreases C) Moisture content increases D) Ash content increases

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Answer & Solution

Answer: Option A

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44

Blast furnace gas is a very poisonous gas because of its predominantly high __________ content.

A) H₂O B) CO₂ C) CO D) CH₄

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Answer & Solution

Answer: Option C

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45

The maximum adiabatic flame temperature in air as compared to that in pure oxygen is

A) Much lower B) Much higher C) Same D) Either lower or higher, depends on the type of fuel

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Answer & Solution

Answer: Option A

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46

Coke made in narrower by-product coke ovens (as compared to wider ovens) is

A) Less reactive B) Stronger C) Smaller in size D) All of the above

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Answer & Solution

Answer: Option D

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47

Ammonia content in raw coke oven gas is about __________ gm/Nm³.

A) 1 B) 15 C) 50 D) 100

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Answer & Solution

Answer: Option B

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48

Fusion point of coal ash increases with increase in its __________ content.

A) Iron sulphate B) Iron silicate C) Lime and magnesia D) All of the above

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Answer & Solution

Answer: Option D

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49

A coal with high ash content is undesirable, as

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

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Answer & Solution

Answer: Option D

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50

Fuel for a fast breeder nuclear reactor is

A) Plutonium B) Uranium C) Radium D) Neptunium

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Answer & Solution

Answer: Option A

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Fuels And Combustion MCQ Questions & Answers | Chemical Engineering