A. 0.5
B. < 0.5
C. > 0.6
D. < 0.1
Related Mcqs:
- Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is_______________?
A. 0.2
B. 0.4
C. 0.6
D. 0.8 - Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is________________?
A. 0.1
B. > 1
C. < 1
D. 1 - At Pr > 1, conduction in an ordinary fluid flowing through a heated pipe is limited to the___________________?
A. Buffer zone
B. Turbulent core
C. Both A. and B.
D. Viscous sub-layer - At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical ?
A. 1
B. 1
D. None of these - For _______________ Prandtl number values, the heat conduction will be negligible in the buffer zone?
A. Extremely low
B. Low
C. High
D. No - A fluid is flowing inside the inner tube of a double pipe heat exchanger with diameter ‘d’. For a fixed mass flow rate, the tube side heat transfer co-efficient for turbulent flow conditions is proportional to_____________________?
A. d0.8
B. d-0.2
C. d-1
D. d-1.8 - Prandtl and Reynold’s analogies are identical for Prandtl number value of__________________?
A. 0
B. 0.5
C. 1
D. 5 - 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 - If average heat transfer co-efficient is ha and the local coefficient at the end of the plate is hl then in case of heat transfer to a fluid flowing over a flat plate, heated over its entire length________________?
A. ha = hl
B. ha = 2hl
C. ha = 0.5 hl
D. ha = 0.75 hl - Prandtl and Reynolds analogy are same, when Prandtl number is____________________?
A. 0.5
B. 1
C. > 2
D. 1.5
