Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above _____________ °C?

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....

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...

Neutral atmosphere is maintained in a/an ____________ furnace?

A. Cold rolled steel coil annealing B. Open hearth C. Soaking pit D. Walking beam reheating...

Higher furnace temperature cannot be achieved by use of a lean fuel gas in the furnace by_________________?

A. Increasing the draft in the furnace B. Preheating the fuel gas C. Oxygen enrichment of combustion air D. Preheating the combustion air...

Which of the following furnaces will have maximum thermal efficiency ?

A. Soaking pits B. Walking beam reheating furnace C. Boiler furnace D. Rotary kilns...