2867. C/H ratio is the maximum in case of
Coal
Furnace oil
Natural gas
Naphtha
✅ The correct answer is option A.
2872. Desirable “Micum Index” values of metal-lurical coke are
M40 > 78% and M10 < 10%
M40 > 4% and M10 < 80%
M40 > 10% and M10 < 78%
M40 > 98% and M10 < 2%
✅ The correct answer is option A.
2835. The advantage of firing pulverised coal in the furnace lies in the fact, that it
Permits the use of high ash content coal
Permits the use of low fusion point ash coal
Accelerates the burning rate and economises on fuel combustion
All of the above
✅ The correct answer is option C.
2839. As the equilibrium moisture content of the coal increases, its
Calorific value increases
Swelling number decreases
Swelling number increases
Bulk density decreases
✅ The correct answer is option B.
2844. Low temperature carbonisation of coal produces
Metallurgical coke
Soft coke
Very low calorific value coke oven gas
No by-products
✅ The correct answer is option B.
2850. During its calorific value determination by bomb calorimeter, coal is combusted by
Air
Oxygen
Oxygen enriched air
None of these
✅ The correct answer is option B.
2855. Presence of force moisture in coal is most disadvantageous during its
Transportation and handling
Washing
Pulverisation
Storage
✅ The correct answer is option C.
2859. Coal is heated in absence of air for 7 minutes at a temperature of about __________ °C, during its volatile matter determination for proximate analysis.
550
750
950
1150
✅ The correct answer is option C.
2863. Narrow coke ovens as compared to wider coke ovens
Produce smaller coke
Produce stronger coke
Require less time of carbonisation
All of the above
✅ The correct answer is option D.
2868. Which of the following is the maximum coal producing state in India?
Orissa
West Bengal
Jharkhand
Assam
✅ The correct answer is option C.