Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity) ____________________?

Question: Ferrites are __________ magnetic.
[A].

anti

[B].

para

[C].

ferri

[D].

ferro

Answer: Option C

Explanation:

No answer description available for this question.

Question: During sensible cooling of air, its wet bulb temperature
[A].

decreases but dew point remains constant.

[B].

increases but dew point remains constant.

[C].

increases & the dew point decreases.

[D].

decreases & the dew point increases.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Annealing of metal does not
[A].

precede its wire drawing.

[B].

induce softness and removes stresses & dissolved gases.

[C].

refine the crystalline structure & produce a definite microstructure.

[D].

alter toughness, ductility and magnetic & electrical or other physical properties.

Answer: Option A

Explanation:

No answer description available for this question.

Question: A steam pipe is intended to be insulated with two layers of insulating materials of different thermal conductivities. For minimum heat transfer to take place
[A].

the better insulation material should be put just next to pipe (i.e., inside).

[B].

the better insulating material should be put outside.

[C].

either of the insulating material could be put on either side.

[D].

steam temperature is considered before deciding as to which insulating material is to be put inside (i.e., just next to the pipe).

Answer: Option A

Explanation:

No answer description available for this question.

Question: Adhesives
[A].

can’t be used in the form of pressure sensitive tapes.

[B].

can’t join two dissimilar metals.

[C].

cure instantaneously after application on a surface.

[D].

none of these.

Answer: Option D

Explanation:

No answer description available for this question.