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

Question: Amount of coal lost in ash particle, which is carried through the boiler system, depends upon the
[A].

physical nature, ash content and fineness of the coal.

[B].

amount of excess air supplied and load on the boiler.

[C].

type of burner and combustion chamber.

[D].

all (a), (b) and (c)

Answer: Option D

Explanation:

No answer description available for this question.

Question: In practical operation of any furnace, zero oxygen percentage or theoretical CO2 percentage in flue gas is rarely achieved, because of
[A].

use of non-preheated combustion air.

[B].

use of pulverised solid fuels.

[C].

imperfect mixing of fuel & air and infiltration of air.

[D].

use of excessive positive draft in the furnace.

Answer: Option C

Explanation:

No answer description available for this question.

Question: An example of indirectly heated furnace is the
[A].

soaking pit

[B].

muffle furnace

[C].

reheating furnace

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.