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March 2019

Thickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is_________________?

Chemical Heat Transfer /
Thickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is_________________?

A. 1
B. < 1
C. > 1
D. > 5

Thickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is_________________? Read More »

Chemical Heat Transfer

For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally ?

Chemical Heat Transfer /
For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally ?

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

For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally ? Read More »

Chemical Heat Transfer

For a counter current heat exchanger with Ti h = 80°C, T°c = 60°C, T°h = 50°C and Ti c = 30°C, and the temperature difference between the two streams being the same everywhere along Z, the direction of flow of hot fluid. The temperature profile should satisfy___________________?

Chemical Heat Transfer /
For a counter current heat exchanger with Ti h = 80°C, T°c = 60°C, T°h = 50°C and Ti c = 30°C, and the temperature difference between the two streams being the same everywhere along Z, the direction of flow of hot fluid. The temperature profile should satisfy___________________?

A. d2T/dZ2 > 0
B. d2T/dZ2 = 0
C. d2T/dZ2 < 0
D. dT/dZ = 0

For a counter current heat exchanger with Ti h = 80°C, T°c = 60°C, T°h = 50°C and Ti c = 30°C, and the temperature difference between the two streams being the same everywhere along Z, the direction of flow of hot fluid. The temperature profile should satisfy___________________? Read More »

Chemical Heat Transfer

Heat flux through several resistances in series in analogous to the current flowing through several_____________________?

Chemical Heat Transfer /
Heat flux through several resistances in series in analogous to the current flowing through several_____________________?

A. Resistances in parallel
B. Capacitors in series
C. Resistances in series
D. None of these

Heat flux through several resistances in series in analogous to the current flowing through several_____________________? Read More »

Chemical Heat Transfer

At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical ?

Chemical Heat Transfer /
At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical ?

A. 1
B. 1
D. None of these

At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical ? Read More »

Chemical Heat Transfer