Helium is produced on commercial scale from

Question: Brazing is the joining of metals
[A].

without melting the base metal.

[B].

with a non-ferrous filler.

[C].

both (a) & (b).

[D].

neither (a) nor (b).

Answer: Option C

Explanation:

No answer description available for this question.

Question: Limestone is added in the blast furnace (during pig iron manufacture) to
[A].

form slag by combining with impurities.

[B].

supply heat by undergoing exothermic reaction with impurities.

[C].

reduce the coke consumption.

[D].

reduce slag viscosity.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Which of the following relatively employs the highest heat transfer surface area in a high pressure boiler ?
[A].

Airpreheater

[B].

Economiser

[C].

Steam superheater

[D].

Furnace water wall

Answer: Option A

Explanation:

No answer description available for this question.