3401. A good coking coal should have high __________ content.
Ash
Sulphur & phosphorus
Moisture
None of these
✅ The correct answer is option D.
Chemical Engineering
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3402. With increase in moisture content of coal, its
Calorific value increases sometimes
Bulk density always decreases
Clinkering tendency during combustion increases
None of these
✅ The correct answer is option D.
3403. Coal tar fuel – 200 (CTF 200) is a mixture of
Pitch and creosote oil
Light oil and pitch
Anthracene and crecosote oil
Solar oil and pitch
✅ The correct answer is option A.
3404. In Lurgi coal gasifier,
Coking coals cannot be used
Low carbon conversion efficiency is achieved
Entrainment of solids is higher
Larger quantity of coal can be processed
✅ The correct answer is option D.
3405. Which of the following is not a product of tar distillation?
Phenol & naphthalene
Benzol & pitch
Anthracene & creosote
None of these
✅ The correct answer is option D.
3406. During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the __________ of the mass.
Density
Porosity
Electrical resistivity
None of these
✅ The correct answer is option A.
3407. Washing of coal is done to reduce the
Inherent impurities
Adhering impurities
Mineral matter
Both B and C
✅ The correct answer is option D.
3408. Main constituent of natural gas is
CH₄ (upto 90%)
C₂H₆
C₃H₈
H₂
✅ The correct answer is option A.
3409. Pyrometric cone equivalent (PCE) of a refractory is the measure of its
spalling resistance.
fusion point.
resistance to slag penetration.
resistance to carbon monoxide attack.
✅ The correct answer is option B.
3410. Specific gravity of uranium and plutonium is about
9
13
19
27
✅ The correct answer is option C.