A. Same as that for fluid flow
B. Less than that for fluid flow
C. More than that for fluid flow
D. D2 – D1 (D1 and D2 are I.D. of inner and outer pipes respectively)
Related Mcqs:
- For turbulent flow (NRe > 2100) of low viscosity fluid (μ > 20cp) in steel pipes, the optimum inside pipe diameter is given by(where, Q = fluid flow rate, ft3/sec, ρ = fluid density, lb/ft3 μ = fluid viscosity, centipoise Di = optimum inside pipe diameter, inches) ?
A. Di, opt = 3.9 Q0.45 ρ0.13
B. Di, opt = 3.9 Q0.45. μ0.95
C. Di, opt = 4.7 Q0.36. μ3.2ρ0.13
D. Di, opt = 3 Q0.36. μ0.88 - Tube side pressure drop in a 1-2 heat exchanger (for turbulent flow of fluids through the tubes) is about __________ times, that in a 1-1 heat exchanger having the same size & number of tubes and operated at the same liquid flow rate ?
A. 2
B. ½
C. 4
D. 8 - The average velocity in the tubes of a 1-4 heat exchanger is ______________ times that in 1-1 heat exchanger having the same size & number of tubes and operated at same liquid flow rate ?
A. 2
B. 1/2
C. 4
D. 1/4 - The thickness of heat transfer plates used in the plate type heat exchanger ranges from _____________ mm, pressed in a single piece provided with grooves & corrugations?
A. 0.3 to 0.8
B. 1.25 to 3.125
C. 3.5 to 7.0
D. 8 to12 - Which tube arrangement in a heat exchanger would facilitate highest heat transfer rate ?
A. Triangular pitch
B. Square pitch
C. Diagonal square pitch
D. Heat transfer rate is independent of tube arrangement - In case of a shell and tube heat exchanger, the effect of L/D on inside film heat transfer coefficient (hi) vanishes after a Reynold number of_____________?
A. 1000
B. 3000
C. 5000
D. 10000 - In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones; because the smaller diameter tubes ______________?
A. Are easier to clean
B. Are less prone to fouling
C. Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less
D. None of these - In a shell and tube heat exchanger, the overall heat transfer co-efficient is proportional to the tube side (volumetric flow rate)0.8. This is valid, only when the ratio of the tube side film resistance to the total resistance is almost equal to____________________?
A. ∞
B. 1
C. 20.8
D. 2 - _____________ heat exchanger is also known as ‘hair pin type’ exchanger?
A. Double pipe
B. Finned
C. Plate type
D. Regenerative - In a heat exchanger, shell side fluid velocity can be changed by changing the tube _______________________?
A. Layout
B. Pitch
C. Both A. & B.
D. Neither A. nor B.
