Principal alloying element in Elinvar (used for making hair springs for watches) is__________________?

Question: Dielectric
[A].

is an electrical insulating material.

[B].

of low resistivity is preferred.

[C].

should have high thermal conductivity.

[D].

need not defy the corrosive action of chemicals.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles (i.e., froth), which will hold the ore particles, but it does not affect the floatability of minerals. Which of the following is not used as a frother?
[A].

Cresylic acid

[B].

Xanthaies

[C].

Pine oil

[D].

all ‘a’ ‘b’ & ‘c’

Answer: Option B

Explanation:

No answer description available for this question.

Question: Direct conversion of thermal energy to electrical energy is facilitated by the
[A].

fuel cells.

[B].

photo voltaic cell.

[C].

magneto hydrodynamic generator.

[D].

none of these.

Answer: Option C

Explanation:

No answer description available for this question.