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

Related Mcqs:

The heating capacity of muffle furnace depends on the_________________?

A. Surface area & emissivity of the stock B. Properties of the muffle wall (temperature, area, and emissivity) C. Both A. & B. D. Neither A. nor B....

Thermal efficiency of an open hearth furnace may be about _____________ percent?

A. 5 B. 20 C. 50 D. 80...

In low or standard frequency induction furnace, heat is produced by the_______________________?

A. Combination of induced current and skin effect B. Induction and resistance C. Current flow through a heating element D. None of these...

Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by______________________?

A. Preheating the combustion air B. Oxygen enrichment of combustion air C. Preheating the fuel gas D. All A., B. & C....

Size of the combustion chamber of a furnace depends upon the ___________________?

A. Heat release rate of the fuel B. Preheat temperature of fuel & air C. Method of mixing the fuel & air D. All A., B. and C....