Furnace Technology
The reason for excessive clinker formation in gas producers is the

Use of coal/coke containing a high % of fines and ash
Development of hot spots in the fuel bed and an abnormally high rate of gasification
All of these
Use of fuel having too low an ash fusion temperature

ANSWER DOWNLOAD EXAMIANS APP

Furnace Technology
Recuperator is

Not used for fuel gas preheating
An intermittant waste heat recovery equipment
Heavier than regenerator meant for the same duty
A continuous waste heat recovery equipment

ANSWER DOWNLOAD EXAMIANS APP

Furnace Technology
The amount of combustible escaping uncon-sumed from the furnace, depends upon the

All of these
Air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by change of direction)
Burner design (thoroughness of mixing versus stratification)
Air supplied and furnace temperature

ANSWER DOWNLOAD EXAMIANS APP

Furnace Technology
In a furnace employing forced draught as compared to induced draught,

Positive pressure exists in the furnace
Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced
The fan operates hot and hence blades are liable to corrosion and erosion
None of these

ANSWER DOWNLOAD EXAMIANS APP