Fuels MCQ

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With increase in the porosity, thermal spalling resistance of fireclay brick

ক
increases

খ
decreases

গ
remains same

ঘ
may increase or decrease
Which of the following constituents of coal is the most important in the production of coke?

ক
ash

খ
moisture

গ
Volatiles

ঘ
carbon
Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its

ক
friability & oxygen content

খ
caking index

গ
yield of carbonized products

ঘ
calorific value
Fixed carbon in coal is defined as

ক
that present in volatile matters

খ
the total quantity of carbon present in ash

গ
hundred minus the percentage of volatile matter ash & moisture

ঘ
the one which is present in the residue after ash formed
Main constituents of benzol are

ক
benzene, toluene & xylene

খ
tar & creosote

গ
anthracene & phenol

ঘ
ammonia & phenol
L.D. Converters are generally lined with

ক
magnesite

খ
fireclay

গ
chrome magnesite

ঘ
silica
Percentage of methane in coke oven gas may be around

ক
5

খ
25

গ
15

ঘ
35
Presence of free moisture in coal during its high temperature carbonisation

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

খ
reduces the coking time

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

ঘ
none of these
During combustion of gaseous fuels, deficiency of air

ক
does not affect the flame length

খ
increases the flame temperature

গ
tends to shorten the flame

ঘ
lengthens the flame
When crude oil is heated, then which of the following hydrocarbon is given off first?

ক
kerosene

খ
gasoline

গ
paraffin

ঘ
natural gas
Which of the following is the lightest and most volatile liquid fuel?

ক
diesel

খ
petrol

গ
gasoline

ঘ
fuel oil