Chemical Heat Transfer

Which of the following has the lowest overall heat transfer co-efficient ?

Byadmin March 2, 2019August 24, 2021

Which of the following has the lowest overall heat transfer co-efficient ?

A. Dowtherm
B. Molten sodium
C. Water
D. Air

Chemical Heat Transfer

Boiling point elevation for a strong and concentrated solution is found by Duhring’s rule, which states that at the same pressure, the boiling point of a solution is a linear function of the _______________ of pure water?

Boiling point elevation for a strong and concentrated solution is found by Duhring’s rule, which states that at the same pressure, the boiling point of a solution is a linear function of the _______________ of pure water?

A. Boiling point
B. Dynamic viscosity
C. Kinematic viscosity
D. Density

Read More Boiling point elevation for a strong and concentrated solution is found by Duhring’s rule, which states that at the same pressure, the boiling point of a solution is a linear function of the _______________ of pure water?
Chemical Heat Transfer

It is not recommended to use a 1-2 shell and tube heat exchanger for a particular heat duty, whenever the LMTD correction factor is___________________?

It is not recommended to use a 1-2 shell and tube heat exchanger for a particular heat duty, whenever the LMTD correction factor is___________________?

A. > 0.75
B. < 0.75
C. < 0.50
D. < 0.25

Read More It is not recommended to use a 1-2 shell and tube heat exchanger for a particular heat duty, whenever the LMTD correction factor is___________________?
Chemical Heat Transfer

A hot body will radiate heat most rapidly, if its surface is___________________?

A hot body will radiate heat most rapidly, if its surface is___________________?

A. White & rough
B. Black & rough
C. White & polished
D. Black & polished

Read More A hot body will radiate heat most rapidly, if its surface is___________________?
Chemical Heat Transfer

The ratio of kinematic viscosity to thermal diffusivity is called the _______________ number?

The ratio of kinematic viscosity to thermal diffusivity is called the _______________ number?

A. Peclet
B. Prandtl
C. Stanton
D. Nusselt

Read More The ratio of kinematic viscosity to thermal diffusivity is called the _______________ number?
Chemical Heat Transfer

The rate of emission of radiation by a body does not depend upon the__________________?

The rate of emission of radiation by a body does not depend upon the__________________?

A. Wavelength of radiation
B. Surface temperature of the body
C. Nature of the surface
D. Shape and porosity of the body

Read More The rate of emission of radiation by a body does not depend upon the__________________?
Chemical Heat Transfer

Prandtl and Reynold’s analogies are identical for Prandtl number value of__________________?

Prandtl and Reynold’s analogies are identical for Prandtl number value of__________________?

A. 0
B. 0.5
C. 1
D. 5

Read More Prandtl and Reynold’s analogies are identical for Prandtl number value of__________________?