Chemical Heat Transfer

Open pan evaporators are preferred to be used, when the solution to be concentrated is_________________?

Byadmin March 2, 2019August 24, 2021

Open pan evaporators are preferred to be used, when the solution to be concentrated is_________________?

A. Scaling
B. Highly viscous
C. Corrosive
D. Salty

Chemical Heat Transfer

Heat flux increases with temperature drop beyond the Leiden frost point in the plot of heat flux vs. temperature drop for a boiling liquid, because___________________?

Heat flux increases with temperature drop beyond the Leiden frost point in the plot of heat flux vs. temperature drop for a boiling liquid, because___________________?

A. Convection becomes important
B. Conduction becomes important
C. Radiation becomes important
D. Sub-cooled boiling occurs

Read More Heat flux increases with temperature drop beyond the Leiden frost point in the plot of heat flux vs. temperature drop for a boiling liquid, because___________________?
Chemical Heat Transfer

With increase in temperature, the thermal conductivity of a gas ___________________?

With increase in temperature, the thermal conductivity of a gas ___________________?

A. Increases
B. Decreases
C. Remain same
D. May increase or decrease depending on the type of gas

Read More With increase in temperature, the thermal conductivity of a gas ___________________?
Chemical Heat Transfer

Heat transfer by radiation between two bodies at T1 & T2 and in an ambient temperature of Ta°C depends on_____________?

Heat transfer by radiation between two bodies at T1 & T2 and in an ambient temperature of Ta°C depends on_____________?

A. T1 – T2
B. T1 – Ta
C. T2 – Ta
D. None of these

Read More Heat transfer by radiation between two bodies at T1 & T2 and in an ambient temperature of Ta°C depends on_____________?
Chemical Heat Transfer

Overall thermal resistance for conductive heat transfer through a series of flat resistances is equal to the____________________?

Overall thermal resistance for conductive heat transfer through a series of flat resistances is equal to the____________________?

A. Maximum resistance in the series
B. Sum of all resistances
C. Average of all resistances
D. Minimum resistance presents in the series

Read More Overall thermal resistance for conductive heat transfer through a series of flat resistances is equal to the____________________?
Chemical Heat Transfer

Increasing the liquor level in the evaporator results in the_______________?

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

Read More Increasing the liquor level in the evaporator results in the_______________?
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_________________?

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