Fuels and Combustion MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Fuels and Combustion, a fundamental topic in the field of Power Plant Engineering. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Fuels and Combustion MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Fuels and Combustion mcq questions that explore various aspects of Fuels and Combustion problems. Each MCQ is crafted to challenge your understanding of Fuels and Combustion principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Power Plant Engineering tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Fuels and Combustion MCQs are your pathway to success in mastering this essential Power Plant Engineering topic.

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Fuels and Combustion MCQs | Page 4 of 50

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Q31.
Pick out the wrong statement.

a.

LPG is also used as fuel for automobiles & small furnaces and for cutting & welding of metals.

b.

The minimum temperature, at which a petroleum oil vapor catches fire and continues to burn, is called its flash point.

c.

Each ton of petroleum oil on distillation produces about 30-50 Nm³ of gas.

d.

Maximum yield of naphthalene is obtained on distillation of crude oil.

Discuss
Answer: (b).The minimum temperature, at which a petroleum oil vapor catches fire and continues to burn, is called its flash point.
Q32.
Stack heat losses can be minimised by

a.

controlling the excess air.

b.

oxygen enrichment of combustion air.

c.

using low c.v. fuels.

d.

maintaining proper draft in the furnace.

Discuss
Answer: (a).controlling the excess air.
Q33.
Laboratory gas is obtained by the cracking of

a.

gasoline

b.

diesel

c.

fuel oil

d.

kerosene

Discuss
Answer: (d).kerosene
Q34.
Bituminous coal

a.

ignites less easily than anthracite.

b.

is generally coking.

c.

burns with smoky yellow flame.

d.

both (b) and (c).

Discuss
Answer: (d).both (b) and (c).
Q35.
Ratio of primary air to secondary air increases with increase in the rank of coal, because the

a.

high rank coals have higher amount of volatile matter.

b.

ratio of fixed carbon to volatile matter increases.

c.

oxygen content progressively decreases.

d.

calorific value of the coal increases.

Discuss
Answer: (b).ratio of fixed carbon to volatile matter increases.
Q36.
Higher percentage of ash in coal meant for the production of metallurgical grade coke

a.

decreases the hardness of coke.

b.

decreases the abrasion resistance of coke.

c.

causes brittleness in steel.

d.

none of these.

Discuss
Answer: (d).none of these.
Q37.
Combustion of pulverised coal as compared to that of lump coal

a.

develops a non-luminous flame.

b.

develops a low temperature flame.

c.

can be done with less excess air.

d.

provides a lower rate of heat release.

Discuss
Answer: (c).can be done with less excess air.
Q38.
'Wobbe index' is a characteristic of

a.

solid fuels

b.

gaseous fuels

c.

liquid fuels

d.

fat coals

Discuss
Answer: (b).gaseous fuels
Q39.
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 (a), (b) and (c).

Discuss
Answer: (d).all (a), (b) and (c).
Q40.
Presence of free moisture in coal during its high temperature carbonisation

a.

reduces the coking time.

b.

protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls.

c.

increases the loss of fine coal dust from the ovens when charging.

d.

none of these.

Discuss
Answer: (b).protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls.
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