A. Permits the use of high ash content coal
B. Permits the use of low fusion point ash coal
C. Accelerates the burning rate and economises on fuel consumption
D. All A., B. and C.
Related Mcqs:
- 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. Higher power consumption in its transportation
D. Erosion of induced draft fan blades - Pulverised fuel fired furnaces employ ______________ fuel firing?
A. Horizontal
B. Vertical
C. Tangential
D. All A., B. and C. - Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C ?
A. 5
B. 60
C. 20
D. 40 - Use of pulverised coal in boilers provides____________________?
A. Higher calorific value
B. Better combustion
C. Smokeless burning
D. Less erosion on furnace wall - 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 air - Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace ?
A. Increase in calorific value of the fuel
B. Increase in flame temperature
C. Reduction in scale losses
D. Saving in fuel consumption - An improved and fuel efficient version of the pusher type reheating furnace is the ______________ furnace?
A. Walking beam
B. Shaft
C. Tunnel
D. Rotary hearth - The electric furnace in which heat is produced by a combination of induced current and skin effect is called _____________ furnace?
A. Arc
B. Resistance
C. Low frequency induction
D. High frequency induction - While the fuel fired furnace can be used upto a maximum temperature of about 1700°C, the electric furnace can be used upto a temperature of about _____________ °C?
A. 2000
B. 3000
C. 4500
D. 6000 - An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called ____________ furnace?
A. Resistance
B. Arc
C. Low frequency induction
D. None of these
