40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is____________________?

Byadmin January 24, 2019August 16, 2021

40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is____________________?

A. 0.45
B. 0.55
C. 0.40
D. 0.75
E. 0.60

CHEMICAL ENGINEERING | Heat Transfer

Black liquor generated during paper manufacture is concentrated in a

Question: Black liquor generated during paper manufacture is concentrated in a
[A].

single effect evaporator.
[B].
single effect evaporator followed by a crystalliser.
[C].
multiple effect evaporator.
[D].
multiple effect evaporators followed by a crystalliser.

Answer: Option C

Explanation:

No answer description available for this question.

Read More Black liquor generated during paper manufacture is concentrated in a
Heat Transfer

Fourier’s law of heat conduction is valid for_________________?

Fourier’s law of heat conduction is valid for_________________?

A. one dimensional cases only
B. two dimensional cases only
C. three dimensional cases only
D. regular surfaces having non-uniform temperature gradients
E. irregular surfaces

Read More Fourier’s law of heat conduction is valid for_________________?
CHEMICAL ENGINEERING | Heat Transfer

Increasing the liquor level in the evaporator results in the

Question: Increasing the liquor level in the evaporator results in the
[A].

decreased capacity.
[B].
increase in liquor film co-efficient.
[C].
decreased effect of hydrostatic head.
[D].
increased true temperature drop.

Answer: Option A

Explanation:

No answer description available for this question.

Read More Increasing the liquor level in the evaporator results in the
CHEMICAL ENGINEERING | Heat Transfer

Correction is applied to LMTD for __________ flow.

Question: Correction is applied to LMTD for __________ flow.
[A].

parallel
[B].
counter
[C].
cross
[D].
none of these

Answer: Option C

Explanation:

No answer description available for this question.

Read More Correction is applied to LMTD for __________ flow.
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

In a vapour compression system, the condition of refrigerant before passing through the condenser is

Question: In a vapour compression system, the condition of refrigerant before passing through the condenser is
[A].

saturated liquid
[B].
wet vapour
[C].
dry saturated vapour
[D].
superheated vapour

Answer: Option D

Explanation:

No answer description available for this question.

Read More In a vapour compression system, the condition of refrigerant before passing through the condenser is
CHEMICAL ENGINEERING | Heat Transfer

For flow over a flat plate, the ratio of thermal boundary layer thickness, ‘xt’ and hydrodynamic boundary layer thickness ‘x’ is equal to (where, NPr = Prandtl number)

Question: For flow over a flat plate, the ratio of thermal boundary layer thickness, ‘xt’ and hydrodynamic boundary layer thickness ‘x’ is equal to (where, NPr = Prandtl number)
[A].

NPr
[B].
NPr1/3
[C].
NPr-1
[D].
NPr-1/3

Answer: Option B

Explanation:

No answer description available for this question.

Read More For flow over a flat plate, the ratio of thermal boundary layer thickness, ‘xt’ and hydrodynamic boundary layer thickness ‘x’ is equal to (where, NPr = Prandtl number)

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