Question: At constant temperature, the thermal conductivities of gases __________ with rise in pressure.
[A].

decrease

[B].

increase

[C].

remain unchanged

[D].

may increase or decrease; depends on the pressure

Answer: Option A

Explanation:

No answer description available for this question.

Question: In Fourier’s law, the proportionality constant is called the
[A].

heat transfer co-efficient

[B].

thermal diffusivity

[C].

thermal conductivity

[D].

Stefan-Boltzman constant

Answer: Option C

Explanation:

No answer description available for this question.

Question: Boiling of milk in an open vessel is an example of __________ boiling.
[A].

film

[B].

sub-cooled

[C].

saturated nucleate

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Film boiling occurs at __________ pressure.
[A].

atmospheric

[B].

sub-atmospheric

[C].

negative

[D].

very high

Answer: Option D

Explanation:

No answer description available for this question.

Question: Heat flux, as defined in heat flow is analogous to __________ in electricity flow.
[A].

current

[B].

voltage

[C].

resistance

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: A perfect black body is a perfect __________ of radiation.
[A].

absorber

[B].

emitter

[C].

both (a) & (b)

[D].

neither (a) nor (b)

Answer: Option C

Explanation:

No answer description available for this question.

Question: Nusselt number is a function of Prandtl number and __________ number of fluid in natural convection heat transfer.
[A].

Grashoff

[B].

Biot

[C].

Stantan

[D].

Reynolds

Answer: Option A

Explanation:

No answer description available for this question.

Question: __________ chart is known as transient heat conduction chart.
[A].

Dirhing’s

[B].

Heisler’s

[C].

Mollier’s

[D].

Cox

Answer: Option A

Explanation:

No answer description available for this question.

Question: With increase in temperature, the thermal conductivity of non-metallic amorphous solids
[A].

decreases

[B].

increases

[C].

remains constant

[D].

first decreases upto certain temperature and then increases

Answer: Option B

Explanation:

No answer description available for this question.

Question: With increase in temperature, the thermal conductivity of most liquids
[A].

increases

[B].

decreases

[C].

remains same

[D].

first increases upto a certain temperature and then becomes constant

Answer: Option B

Explanation:

No answer description available for this question.