Which of the following petrographic constituents of coal is non-coking ?
Which of the following petrographic constituents of coal is non-coking ?
A. Vitrain
B. Clarain
C. Durain
D. Fussain
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In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of__________________?
In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of__________________?A. Transportation of coal
B. Drying of coal
C. Combustion of coal by supplying it around the burner
D. Preheating the primary airWhich of the following fuel gases is heavier than air ?
Which of the following fuel gases is heavier than air ?A. Blast furnace gas
B. Coke oven gas
C. Natural gas
D. Water gasHeat penetration rate in narrow coke ovens in high temperature carbonisation of coal is around ______________ cm/hr?
Heat penetration rate in narrow coke ovens in high temperature carbonisation of coal is around ______________ cm/hr?A. 2.5
B. 0.5
C. 10
D. 20The cuprous chloride used in orsat apparatus can absorb___________________?
The cuprous chloride used in orsat apparatus can absorb___________________?A. Only CO
B. Both CO and CO2
C. Both CO and O2
D. All CO, CO2, and O2Naphthalene is used for making_________________?
Naphthalene is used for making_________________?A. Insecticides (e.g. moth balls)
B. Unsaturated polyesters
C. Drug intermediates e.g. β-naphthol
D. All A., B. and C.Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing ?
Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing ?A. Ash disposal problem
B. Excessive fly-ash discharge from the stack
C. High power consumption in its transportation
D. Erosion of induced draft fan blades