Chemical Heat Transfer

Which of the following has the minimum absorptivity ?

Byadmin March 3, 2019August 24, 2021

Which of the following has the minimum absorptivity ?

A. Aluminium foil
B. Coal dust
C. Refractory bricks
D. Iron plates

Chemical Heat Transfer

Choose the most important factor on which the heat conducted through a wall in a unit time will depend on ?

Choose the most important factor on which the heat conducted through a wall in a unit time will depend on ?

A. Thickness of the wall
B. Area of the wall perpendicular to heat flow
C. Material of the wall
D. Temperature difference between the two surfaces of the wall

Read More Choose the most important factor on which the heat conducted through a wall in a unit time will depend on ?
Chemical Heat Transfer

For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it__________________?

For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it__________________?

A. Decreases the pressure drop
B. Decreases the outlet temperature of cooling medium
C. Increases the overall heat transfer coefficient
D. None of these

Read More For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it__________________?
Chemical Heat Transfer

“The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium”. This is ______________ law?

“The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium”. This is ______________ law?

A. Kirchoff’s
B. Planck’s
C. Wien’s displacement
D. Stefan-Boltzmann

Read More “The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium”. This is ______________ law?
Chemical Heat Transfer

Low thermal conductivity of heat insulating materials is due to its_________________?

Low thermal conductivity of heat insulating materials is due to its_________________?

A. Dense structure
B. High proportion of air space
C. High specific heat
D. None of these

Read More Low thermal conductivity of heat insulating materials is due to its_________________?
Chemical Heat Transfer

It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30°C. The boiling point of the solution is 110°C, the latent heat of vaporisation is 2100 kJ/kg and the specific heat of the solution is 4 kJ/kg.K. The rate at which the heat has to be supplied in (kJ/min) to the evaporator is____________________?

It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30°C. The boiling point of the solution is 110°C, the latent heat of vaporisation is 2100 kJ/kg and the specific heat of the solution is 4 kJ/kg.K. The rate at which the heat has to be supplied in (kJ/min) to the evaporator is____________________?

A. 3.06 × 105
B. 6.12 × 105
C. 7.24 × 105
D. 9.08 × 105

Read More It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30°C. The boiling point of the solution is 110°C, the latent heat of vaporisation is 2100 kJ/kg and the specific heat of the solution is 4 kJ/kg.K. The rate at which the heat has to be supplied in (kJ/min) to the evaporator is____________________?
Chemical Heat Transfer

Evaporation by thermo compression results in the _________________________?

Evaporation by thermo compression results in the _________________________?

A. Saving of steam
B. Realisation of multiple effect economy in a single effect
C. Both A. and B.
D. None of these

Read More Evaporation by thermo compression results in the _________________________?

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