A black body when hot, emits heat radiation of _____________ wavelengths?
A black body when hot, emits heat radiation of _____________ wavelengths?
A. Small
B. Large
C. All
D. One fixed
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Which 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 number_____________ 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 headChoose the most important factor on which the heat conducted through a wall in a unit time will depend on ?
Choose the most important factor on which the heat conducted through a wall in a unit time will depend on ?A. Thickness of the wall
B. Area of the wall perpendicular to heat flow
C. Material of the wall
D. Temperature difference between the two surfaces of the wallIn a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is_________________?
In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is_________________?A. Infinity
B. Zero
C. Same as average heat transfer co-efficient for tube side
D. None of theseThe equation, (NSt × N2/3 Pr) = f/2, is the ____________ analogy ?
The equation, (NSt × N2/3 Pr) = f/2, is the ____________ analogy ?A. Colburn
B. Reynolds
C. Prandtl
D. None of theseGrashoff number is given by________________?
Grashoff number is given by________________?A. gD3.β.Δtρ2/μ2
B. gD2βΔtρ/μ2
C. gD2βΔtP2μ
D. gD3βΔtP2/μ