A. Heat transfer co-efficient is proportional to 0.8th power
B. Pressure drop is proportional to the square
C. Both A. & B.
D. Neither A. nor B.
Related Mcqs:
- 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 - In a shell and tube heat exchanger having square pitch, the shell side equivalent diameter is given by (where, P = pitch, d = outside diameter of the tube) ?
A. 4(P2 – πd2/4)/πd
B. (P2 – rd2/4)/rd
C. 4P2/πd
D. πd/4P2 - Baffles are provided in a shell and tube heat exchanger to increase the turbulence and velocity of the shell side fluid. Which of the following shaped baffles does not fall in the category of transverse baffle ?
A. Segmental baffle
B. Flat plate extending across the wall
C. Disk type baffle
D. Helical type baffle - The shell side pressure drop in a shell and tube heat exchanger is maximum for _______________ baffle?
A. Disk and ring
B. Segmental
C. Orifice
D. Independent of the type of - In case of a shell and tube heat exchanger, the minimum shell thickness for carbon steel (inclusive of corrosion allowance) depends on shell diameter and is in the range of ________________ mm?
A. 3-5
B. 5-11
C. 8-15
D. 12-18 - The ratio of tube length to shell diameter in case of liquid shell and tube heat exchanger ranges from__________________?
A. 2 to 3
B. 3 to 5
C. 4 to 8
D. 6 to 12 - Ratio of tube length to shell diameter for a shell and tube heat exchanger is________________?
A. 8 : 1 to 12 : 1 for both liquid-liquid and gas-gas heat exchangers
B. 4 : 1 to 8 : 1 for liquid-liquid exchanger
C. < 4 : 1 for gas-gas exchangers
D. Both B. & C. - In a multipass shell and tube heat exchanger, the baffles on shell side is primarily provided for______________?
A. Reducing scale deposition
B. Increasing pressure drop
C. Fixing the tubes
D. Creating turbulence - In a shell and tube heat exchanger having triangular pitch, the shell side equivalent diameter is given by________________?
A. 4(0.86P2 – πd2/4)/πd
B. (P2 – πd2/4)/πd
C. 4(0.86P2 – πd2)/πd
D. (4P2 + πd2/4)/πd - In a multipass shell and tube heat exchanger, the shell side cross flow area does not depend upon______________________?
A. Baffle spacing
B. Clearance
C. Pitch
D. None of these
