Tube expansion allowances exist in _____________ heat exchanger?

A. t
B. 1/ρ
C. 1/A
D. All A., B. & C.

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. Reynolds
B. Nusselt
C. Grashoff
D. Both B. & C.

A. Monochromatic radiation only
B. Total radiation only
C. Both A. and B.
D. Only volumes and not to surfaces

A. Rate of heat transfer
B. Flow velocity
C. Turbulence of shell side fluid
D. All A., B. and C.

A. Aluminium foil
B. Refractory bricks
C. Iron plate
D. Coke breeze