A. d
B. √d
C. √(2πd)
D. √(2d)
Related Mcqs:
- For annular flow of a fluid, the ratio of the equivalent diameter for pressure drop calculation to the equivalent diameter for heat transfer calculation is_________________?
A. d1/(d1 + d2)
B. d2/(d1 + d2)
C. (d1 + d2)/d1
D. (d1 + d2)/d2 - 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 - 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 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 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 - The equivalent diameter for fluid flow through a channel of constant non-circular cross section of area ‘A’ is given by (where, P = perimeter of the channel in contact with the fluid) ?
A. 4 A/P
B. A/P
C. 4 P/A
D. √A - Shell side heat transfer co-efficient in case of square pitch as compared to the triangular pitch under similar condition of fluid flow and tube size is_____________?
A. More
B. Same
C. Less
D. Twice - The equivalent diameter for pressure drop is _______________ that for heat transfer?
A. Smaller than
B. Greater than
C. Equal to
D. Not related with - A pipe is generally made of circular cross-section, because a circular cross-section has the____________________?
A. Higher structural strength
B. Lowest surface area requirement for a given volume
C. Both A. & B.
D. None of these - 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
