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

Which of the following refrigerant has the lowest freezing point?

Question: Which of the following refrigerant has the lowest freezing point?
[A].

R-11
[B].
R-12
[C].
R-22
[D].
Ammonia

Answer: Option C

Explanation:

No answer description available for this question.

Read More Which of the following refrigerant has the lowest freezing point?
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

Which of the following refrigerant is highly toxic and flammable?

Question: Which of the following refrigerant is highly toxic and flammable?
[A].

Ammonia
[B].
Carbon dioxide
[C].
Sulphur dioxide
[D].
R-12

Answer: Option A

Explanation:

No answer description available for this question.

Read More Which of the following refrigerant is highly toxic and flammable?
CHEMICAL ENGINEERING | Heat Transfer

In case of __________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface.

Question: In case of __________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface.
[A].

nucleate
[B].
local
[C].
pool
[D].
saturated

Answer: Option B

Explanation:

No answer description available for this question.

Read More In case of __________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface.
Heat Transfer

A grey body is one whose absorptivity _________________?

A grey body is one whose absorptivity _________________?

A. varies with temperature
B. varies with the wave length of incident ray
C. varies with both
D. does not vary with temperature and wave length of the incident ray
E. there is no such criterion

Read More A grey body is one whose absorptivity _________________?
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

According to Stefan-Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the

Question: According to Stefan-Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the
[A].

absolute temperature
[B].
square of the absolute temperature
[C].
cube of the absolute temperature
[D].
fourth power of the absolute temperature

Answer: Option D

Explanation:

No answer description available for this question.

Read More According to Stefan-Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the
CHEMICAL ENGINEERING | Heat Transfer

In a laboratory test run, the rate of drying was found to be 0.5 x 10-3 kg/m2.s, when the moisture content reduced from 0.4 to 0.1 on dry basis. The critical moisture content of the material is 0.08 on a dry basis. A tray dryer is used to dry 100 kg (dry basis) of the same material under identical conditions. The surface area of the material is 0.04 m2/kg of dry solid. The time required (in seconds) to reduce the moisture content of the solids from 0.3 to 0.2 (dry basis) is

Question: In a laboratory test run, the rate of drying was found to be 0.5 x 10-3 kg/m2.s, when the moisture content reduced from 0.4 to 0.1 on dry basis. The critical moisture content of the material is 0.08 on a dry basis. A tray dryer is used to dry 100 kg (dry basis) of the same material under identical conditions. The surface area of the material is 0.04 m2/kg of dry solid. The time required (in seconds) to reduce the moisture content of the solids from 0.3 to 0.2 (dry basis) is
[A].

2000
[B].
4000
[C].
5000
[D].
6000

Answer: Option C

Explanation:

No answer description available for this question.

Read More In a laboratory test run, the rate of drying was found to be 0.5 x 10-3 kg/m2.s, when the moisture content reduced from 0.4 to 0.1 on dry basis. The critical moisture content of the material is 0.08 on a dry basis. A tray dryer is used to dry 100 kg (dry basis) of the same material under identical conditions. The surface area of the material is 0.04 m2/kg of dry solid. The time required (in seconds) to reduce the moisture content of the solids from 0.3 to 0.2 (dry basis) is

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