The thermal efficiency of an air/fuel gas preheating recuperator may be as high as _____________ percent?

Related Mcqs:

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...

Rotary kilns are used in the____________________?

A. Calcination of limestone & dolomite B. Cement manufacture C. Both A. and B. D. Neither A. nor B....

Use of pulverised coal in boilers provides____________________?

A. Higher calorific value B. Better combustion C. Smokeless burning D. Less erosion on furnace wall...

Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about ____________ percent?

A. 10-15 B. 25-30 C. 45-50 D. 65-70...

Turndown ratio of a burner gives an idea of the ______________ in the furnace?

A. Range of fuel firing rates B. Volume of the combustion chamber C. Maximum heat input rate only D. Minimum heat input rate only...