Finned tube heat exchangers__________________?

Byadmin March 2, 2019August 24, 2021

Finned tube heat exchangers__________________?

A. Give larger area per tube
B. Use metal fins of low thermal conductivity
C. Facilitate very large temperature drop through tube wall
D. Are used for smaller heat load

Chemical Heat Transfer

A body is called grey if the monochromatic emissivity of the body is___________________?

A body is called grey if the monochromatic emissivity of the body is___________________?

A. Zero
B. Unity
C. Same for all wavelengths
D. Different for all wavelengths

Read More A body is called grey if the monochromatic emissivity of the body is___________________?
Chemical Heat Transfer

Heat transfer occurs by natural convection because change in temperature causes difference in__________________?

Heat transfer occurs by natural convection because change in temperature causes difference in__________________?

A. Viscosity
B. Density
C. Thermal conductivity
D. Heat capacity

Read More Heat transfer occurs by natural convection because change in temperature causes difference in__________________?
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

Thermal diffusivity is given by__________________?

Thermal diffusivity is given by__________________?

A. k/ρCp
B. ρCp/k
C. μCp/a
D. μ/hCp

Read More Thermal diffusivity is given by__________________?
Chemical Heat Transfer

Prandtl and Reynolds analogy are same, when Prandtl number is____________________?

Prandtl and Reynolds analogy are same, when Prandtl number is____________________?

A. 0.5
B. 1
C. > 2
D. 1.5

Read More Prandtl and Reynolds analogy are same, when Prandtl number is____________________?
Chemical Heat Transfer

Heat transfer co-efficient (h) for a fluid flowing inside a clean pipe is given by h = 0.023 (K/D) (DVρ/μ)0.8 (CP.μ/k)0.4. This is valid for the value of NRe equal to_______________?

Heat transfer co-efficient (h) for a fluid flowing inside a clean pipe is given by h = 0.023 (K/D) (DVρ/μ)0.8 (CP.μ/k)0.4. This is valid for the value of NRe equal to_______________?

A. 4000
D. > 10000

Read More Heat transfer co-efficient (h) for a fluid flowing inside a clean pipe is given by h = 0.023 (K/D) (DVρ/μ)0.8 (CP.μ/k)0.4. This is valid for the value of NRe equal to_______________?

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