An example of recuperative furnace is the

Question: Joining of thin foils is preferred to be done by
[A].

gamma rays

[B].

X-rays

[C].

microwaves

[D].

gas welding

Answer: Option C

Explanation:

No answer description available for this question.

Question: Heating of an ore below its melting point in presence of excess of air is called
[A].

calcination

[B].

smelting

[C].

roasting

[D].

sublimation

Answer: Option C

Explanation:

No answer description available for this question.

Question: Filler material used in welding having the lowest melting point out of the following is
[A].

aluminium

[B].

soft solder

[C].

silver solder

[D].

brazing spelter

Answer: Option B

Explanation:

No answer description available for this question.

Question: Window panes of aeroplanes are normally made of
[A].

perspex (PMMA)

[B].

teflon (PTFE)

[C].

bakelite (phenol formaldehyde)

[D].

polystyrene

Answer: Option A

Explanation:

No answer description available for this question.