Moisture would find its way into insulation by vapour pressure unless it is prevented by __________________ ?

Byadmin January 24, 2019August 16, 2021

Moisture would find its way into insulation by vapour pressure unless it is prevented by __________________ ?

A. high thickness of insulation
B. high vapour pressure
C. less thermal conductivity insulator
D. a vapour seal
E. all of the above

Heat Transfer

According to Kirchoff’s law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a _________________?

According to Kirchoff’s law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a _________________?

A. grey body
B. brilliant white polished body
C. red hot body
D. black body
E. none of the above

Read More According to Kirchoff’s law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a _________________?
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

Fouling factor is used

Question: Fouling factor is used
[A].

in heat exchanger design as a safety factor
[B].
in case of Newtonian fluids
[C].
when a liquid exchanges heat with a gas
[D].
none of the above

Answer: Option A

Explanation:

No answer description available for this question.

Read More Fouling factor is used
Heat Transfer

Thermal conductivity of water in general with rise in temperature ____________________?

Thermal conductivity of water in general with rise in temperature ____________________?

A. increases
B. decreases
C. remains constant
D. may increase or decrease depending on temperature
E. none of the above

Read More Thermal conductivity of water in general with rise in temperature ____________________?
CHEMICAL ENGINEERING | Heat Transfer

For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are

Question: For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are
[A].

same
[B].
different
[C].
never different
[D].
linearly related

Answer: Option B

Explanation:

No answer description available for this question.

Read More For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are
CHEMICAL ENGINEERING | Heat Transfer

A hot liquid is kept in a big room. The logorithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly a/an

Question: A hot liquid is kept in a big room. The logorithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly a/an
[A].

ellipse
[B].
straight line
[C].
parabola
[D].
circular arc

Answer: Option B

Explanation:

No answer description available for this question.

Read More A hot liquid is kept in a big room. The logorithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly a/an
CHEMICAL ENGINEERING | Heat Transfer

A sphere of radius ‘R1’ is enclosed in a sphere of radius ‘R2’. The view (or shape) factor for radiative heat transfer of the outer sphere with respect to the inner sphere is

Question: A sphere of radius ‘R1’ is enclosed in a sphere of radius ‘R2’. The view (or shape) factor for radiative heat transfer of the outer sphere with respect to the inner sphere is
[A].

0
[B].
R2/(R1+R2)
[C].
1
[D].
(R1/R2)2

Answer: Option B

Explanation:

No answer description available for this question.

Read More A sphere of radius ‘R1’ is enclosed in a sphere of radius ‘R2’. The view (or shape) factor for radiative heat transfer of the outer sphere with respect to the inner sphere is

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