Heat Transfer

Cork is a good insulator because it has___________________?

Byadmin January 24, 2019August 16, 2021

Cork is a good insulator because it has___________________?

A. free electrons
B. atoms colliding frequency
C. low density
D. porous body
E. all of the above

Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,

Question: A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,
[A].

the better insulation must be put inside
[B].
the better insulation must be put outside
[C].
one could place either insulation on either side
[D].
one should take into account the steam temperature before deciding as to which insulation is put where

Answer: Option A

Explanation:

No answer description available for this question.

Read More A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,
CHEMICAL ENGINEERING | Heat Transfer

Fouling factor

Question: Fouling factor
[A].

is a dimensionless quantity.
[B].
does not provide a safety factor for design.
[C].
accounts for additional resistances to heat flow.
[D].
none of these.

Answer: Option C

Explanation:

No answer description available for this question.

Read More Fouling factor
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

At 100% relative humidity, wet bulb temperature, dry bulb temperature, dew point temperature and saturation temperature are equal.

Question: At 100% relative humidity, wet bulb temperature, dry bulb temperature, dew point temperature and saturation temperature are equal.
[A].

Correct
[B].
Incorrect

Answer: Option A

Explanation:

No answer description available for this question.

Read More At 100% relative humidity, wet bulb temperature, dry bulb temperature, dew point temperature and saturation temperature are equal.
Heat Transfer

The energy distribution of an ideal reflector at higher temperatures is largely in the range of ___________________?

The energy distribution of an ideal reflector at higher temperatures is largely in the range of ___________________?

A. shorter wavelength
B. longer wavelength
C. remains same at all wavelengths
D. wavelength has nothing to do with it
E. none of the above

Read More The energy distribution of an ideal reflector at higher temperatures is largely in the range of ___________________?
CHEMICAL ENGINEERING | Heat Transfer

Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the

Question: Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
[A].

surrounding temperature.
[B].
average temperature of the fin.
[C].
temperature of the fin end.
[D].
constant temperature equal to that of the base

Answer: Option D

Explanation:

No answer description available for this question.

Read More Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
CHEMICAL ENGINEERING | Heat Transfer

Forced circulation evaporators are normally used for concentrating liquids having

Question: Forced circulation evaporators are normally used for concentrating liquids having
[A].

scaling characteristics
[B].
high viscosity
[C].
both(a) & (b)
[D].
neither (a) nor (b)

Answer: Option C

Explanation:

No answer description available for this question.

Read More Forced circulation evaporators are normally used for concentrating liquids having

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