3091. Coals used for the generation of producer gas should have
High caking index
Low fusion point of ash
High volatile matter content
Very low ash content (8-10%)
✅ The correct answer is option C.
Chemical Engineering
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3092. The main drawback of supplying more excess air in the combustion of fuel is the
Excessive power requirement of air blower
Enhanced sensible heat loss in the flue gas
Intermittant and uncontrolled combustion of the fuel
High exit flue gas temperature from the furnace
✅ The correct answer is option B.
3093. Hard coke is manufactured from
Lignite
Bituminous coal
Semi-anthracite
Anthracite
✅ The correct answer is option B.
3094. The main reason for making the copper calorimeter (used in bomb calorimeter) silvery white and shining/polished is to
Minimise its corrosion
Avoid radiation heat loss
Make it look attractive
None of these
✅ The correct answer is option B.
3095. Critical Air Blast (CAB) value of coke is a direct measure of its
Reactivity
Hardness
Strength
None of these
✅ The correct answer is option A.
3096. Naphthalene is used for making
Insecticides (e.g. moth balls)
Unsaturated polyesters
Drug intermediates e.g. β-naphthol
All of the above
✅ The correct answer is option D.
3097. Net calorific value is the gross calorific value less the __________ heat of water in the product of combustion when cooled to 15°C.
Sensible
Latent
Sensible and latent
None of these
✅ The correct answer is option C.
3098. ‘Fat’ coal means a coal having
Low calorific value
High volatile matter
Low ash content
Non smoking tendency
✅ The correct answer is option B.
3099. The maximum adiabatic flame temperature in air is __________ the maximum flame temperature in pure oxygen.
Lower than
Higher than
Same as
Not related to
✅ The correct answer is option A.
3100. Combustion of pulverised fuel
Requires larger combustion chamber than rich gaseous fuel
In a metallurgical furnace does not contaminate the product in the furnace by ash from fuel
Suppresses the discharge of fine dust and grit into atmosphere
All of the above
✅ The correct answer is option A.