Chemical Heat Transfer

View factor is important in heat transfer by_____________________?

Byadmin March 2, 2019August 24, 2021

View factor is important in heat transfer by_____________________?

A. Steady state conduction
B. Natural convection
C. Forced convection
D. Radiation

Chemical Heat Transfer

Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is_______________?

Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is_______________?

A. 0.2
B. 0.4
C. 0.6
D. 0.8

Read More Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is_______________?
Chemical Heat Transfer

The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the________________ ?

The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the________________ ?

A. Solution has an elevation of boiling point
B. Evaporators operate under vacuum
C. Evaporators operate at atmospheric pressure
D. None of these

Read More The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the________________ ?
Chemical Heat Transfer

The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is__________________?

The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is__________________?

A. 2.36
B. 4.36
C. 120.36
D. Dependent on NRe only

Read More The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is__________________?
Chemical Heat Transfer

In a shell and tube heat exchanger, square pitch compared to triangular pitch__________________?

In a shell and tube heat exchanger, square pitch compared to triangular pitch__________________?

A. Gives a higher shell side pressure drop
B. Gives a lower shell side pressure drop
C. Can pack more surface area into a shell of given diameter
D. None of these

Read More In a shell and tube heat exchanger, square pitch compared to triangular pitch__________________?
Chemical 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______________________?

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

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______________________?
Chemical Heat Transfer

In a heat exchanger, the rate of heat transfer from the hot fluid to the cold fluid___________________?

In a heat exchanger, the rate of heat transfer from the hot fluid to the cold fluid___________________?

A. Varies directly as the area and the LMTD
B. Directly proportional to LMTD and inversely proportional to the area
C. Varies as square of the area
D. None of these

Read More In a heat exchanger, the rate of heat transfer from the hot fluid to the cold fluid___________________?

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