3081. During combustion of gaseous fuels, deficiency of air
Lengthens the flame
Tends to shorten the flame
Does not affect the flame length
Increases the flame temperature
✅ The correct answer is option A.
Chemical Engineering
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3082. Shatter index of the coke is a measure of its
Strength
Bulk density
Reactivity
None of these
✅ The correct answer is option A.
3083. Gross and net calorific value of a fuel will be the same
If its ash content is zero
Ifits carbon content is very low
If its hydrogen/hydrogen compound content is zero
Under no circumstances
✅ The correct answer is option C.
3084. Which is the most matured coal?
Lignite
Bituminous
Semi-anthracite
Anthracite
✅ The correct answer is option D.
3085. Orsat apparatus is meant for
Gravimetric analysis of flue gas
Finding out combustion efficiency
Direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride
None of these
✅ The correct answer is option D.
3086. Bomb calorimeter is used to determine the (where, GCV – Gross Calorific Value. NCV – Net Calorific Value.)
GCV at constant pressure
GCV at constant volume
NCV at constant pressure
NCV at constant volume
✅ The correct answer is option B.
3087. The liquid used for the washing of coal in an industrial coal washery is a mixture of water and
Carbon tetrachloride
Sand (40%)
Mineral oil of high viscosity & specific gravity (1.6)
None of these
✅ The correct answer is option B.
3088. Oxygen percentage (by weight) in atmospheric air is
19
21
23
29
✅ The correct answer is option C.
3089. Producer gas containing least amount of tar is produced by the
Partial combustion of coal
Partial combustion of large size (< 50 mm) coke
High pressure gasification of coal (e.g. in Lurgi gasifier)
Atmospheric pressure gasification of coal (e.g., in Kopper-Totzek gasifier)
✅ The correct answer is option B.
3090. Froth floatation is used for
Washing fine coal dust (< 0.5 mm size)
Washing lump coal (> 80 mm size)
Removing ash from the coal based on difference in specific gravity of coal and ash
All of the above
✅ The correct answer is option A.