Chemical Heat Transfer

With the increase of temperature, the Col-burn jH factor_____________________?

Byadmin March 3, 2019August 24, 2021

With the increase of temperature, the Col-burn jH factor_____________________?

A. Increases
B. Decreases
C. Remains unchanged
D. May increase or decrease; depending on temperature

Chemical Heat Transfer

While the total emissivity of a perfect black body is unity, the same for a real body is__________________?

While the total emissivity of a perfect black body is unity, the same for a real body is__________________?

A. 0
B. 1
C. > 1
D. Between 0 and 1

Read More While the total emissivity of a perfect black body is unity, the same for a real body is__________________?
Chemical Heat Transfer

With increase in temperature, the thermal conductivity of steel___________________?

With increase in temperature, the thermal conductivity of steel___________________?

A. Increases
B. Decreases
C. Remains unchanged
D. Increases exponentially

Read More With increase in temperature, the thermal conductivity of steel___________________?
Chemical Heat Transfer

Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is ____________________?

Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is ____________________?

A. Thin walled having the value of Ao Ai/< 2
B. Thick walled
C. Having the value of Ao/Ai > 2
D. Both B. and C.

Read More Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is ____________________?
Chemical Heat Transfer

Thermal diffusivity is the most important in heat transfer by__________________?

Thermal diffusivity is the most important in heat transfer by__________________?

A. Conduction
B. Radiation
C. Condensation
D. Natural convection

Read More Thermal diffusivity is the most important in heat transfer by__________________?
Chemical Heat Transfer

Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m2.°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the_________________?

Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m2.°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the_________________?

A. Higher condensing film co-efficient is desired
B. Condensate is corrosive in nature
C. Lower pressure drop through the exchanger is desired
D. Temperature of the incoming vapor is very high

Read More Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m2.°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the_________________?
Chemical Heat Transfer

The unit of conductance in SI unit is_______________?

The unit of conductance in SI unit is_______________?

A. W/m
B. W/m2
C. W/°K
D. W/m°K

Read More The unit of conductance in SI unit is_______________?

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