Which of the following has the minimum thermal conductivity ?
Which of the following has the minimum thermal conductivity ?
A. Nitrogen
B. Steel
C. Carbon black
D. Tar
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_____________ heat exchanger is used for chilling oil to be dewaxed?
_____________ heat exchanger is used for chilling oil to be dewaxed?A. U-tube
B. Double pipe
C. Fixed tube
D. Floating headWhich of the following is directly concerned with the heat transfer ?
Which of the following is directly concerned with the heat transfer ?A. Strouhal number
B. Sherwood number
C. Euler number
D. Grashoff numberThe wavelength at which the maximum monochromatic emissive power occurs for a black body, is (where, T = absolute temperature of the black body)?
The wavelength at which the maximum monochromatic emissive power occurs for a black body, is (where, T = absolute temperature of the black body)?A. αT
B. α × 1/T
C. α T4
D. Independent of TIn the free convection regime of pool boiling, the heat flux is proportional to__________________?
In the free convection regime of pool boiling, the heat flux is proportional to__________________?A. Δt1/2
B. Δt2
C. Δt5/4
D. ΔtWhen does the heat generated by fluid friction becomes appreciable compared to the heat transferred between the fluids ?
When does the heat generated by fluid friction becomes appreciable compared to the heat transferred between the fluids ?A. At high fluid velocity
B. At low velocity
C. When fluid flows past a smooth surface
D. None of theseHeat transfer by conduction results due to the transfer of free electrons, kinetic energy & vibrational energy from one molecule to another. Conduction heat transfer cannot take place____________________?
Heat transfer by conduction results due to the transfer of free electrons, kinetic energy & vibrational energy from one molecule to another. Conduction heat transfer cannot take place____________________?A. Between two bodies in physical contact with each other
B. Between two bodies not in physical contact with each other
C. From one part of a body to the another part of the same body
D. Both B & C