Which of the following is not used as a medium for high temperature heating ?

Byadmin March 3, 2019August 24, 2021

Which of the following is not used as a medium for high temperature heating ?

A. Dowtherm
B. Mercury
C. Liquid metal (e.g. molten sodium)
D. Fused salts (e.g., an eutectic mixture of 53% KNO3, 40% NaNO2and 7% NaNO3)

Chemical Heat Transfer

The non-dimensional temperature gradient in a liquid at the wall of a pipe is the ____________________?

The non-dimensional temperature gradient in a liquid at the wall of a pipe is the ____________________?

A. Heat flux
B. Nusselt number
C. Prandtl number
D. Schmidt number

Read More The non-dimensional temperature gradient in a liquid at the wall of a pipe is the ____________________?
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

_____________ heat exchanger is the most suitable, when the temperature of shell side fluid is much higher than that of tube side?

_____________ heat exchanger is the most suitable, when the temperature of shell side fluid is much higher than that of tube side?

A. Single pass, fixed tube sheet
B. U-tube
C. Three pass, fixed tube sheet
D. None of these

Read More _____________ heat exchanger is the most suitable, when the temperature of shell side fluid is much higher than that of tube side?
Chemical Heat Transfer

Unsteady state heat conduction occurs, when_______________?

Unsteady state heat conduction occurs, when_______________?

A. Temperature distribution is independent of time
B. Temperature distribution is dependent on time
C. Heat flows in one direction only
D. Three dimensional heat flow is concerned

Read More Unsteady state heat conduction occurs, when_______________?
Chemical Heat Transfer

In Biot number, the characteristic length used is the ratio of the _______________ of the solid?

In Biot number, the characteristic length used is the ratio of the _______________ of the solid?

A. Volume to surface area
B. Perimeter to surface area
C. Surface area to volume
D. Surface area to perimeter

Read More In Biot number, the characteristic length used is the ratio of the _______________ of the solid?
Chemical Heat Transfer

Heat transfer by natural convection is enhanced in system with__________________?

Heat transfer by natural convection is enhanced in system with__________________?

A. High viscosity
B. High co-efficient of thermal expansion
C. Low temperature gradients
D. Low density change with temperature

Read More Heat transfer by natural convection is enhanced in system with__________________?

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