A. (r1 – r2)/ln(r1/r2)
B. (r1 – r2)/ln(r2/r1)
C. (r2 – r1)/ln(r1/r2)
D. (r1 – r2)/-ln(r1/r2)
A. Avoid buckling of tubes
B. Provide support for tubes
C. Decrease the pressure drop
D. Facilitate its lengthening, if needed
A. Low density
B. High viscosity
C. Partial ionisation
D. Dense structure
A. 1-2 heat exchanger
B. 1-1 heat exchanger
C. 3-2 heat exchanger
D. 2-4 heat exchanger
A. High viscosity liquid is to be cooled
B. Requirement of heat transfer area is low
C. Overall heat transfer co-efficient is very high
D. A corrosive liquid is to be heated
A. (1/U) Vs. (1/v0.8)
B. (1/v0.8) Vs. U
C. v0.8 Vs . U
D. (1/U) Vs. (1/V)
A. Nature of heating surface and distribution of bubbles
B. Surface tension of water
C. Viscosity of water
D. All A., B. and C.