The overall resistance for heat transfer through a series of flat resistance, is the _____________ of the resistances?

A. q = [2π k (Ti + T0)/2]/ln (ri/r0)
B. q = 2π ri k (Ti – T0)/(r0/ri)
C. q = 2π k (Ti – T0)/(r0/ri)
D. q = 2π k (Ti – T0)/[(r0 + ri)/2]

A. Oily
B. Coated
C. Clean & smooth
D. Dirty

A. Thermal diffusivity/Momentum diffusivity
B. Thermal diffusivity × Momentum
C. Thermal diffusivity × Mass diffusivity
D. Mass diffusivity × Momentum diffusivity

A. Pe = Re.Pr
B. Pe = Re/Pr
C. Pe = Pr/Re
D. Pe = Nu.Re

A. BTU/hr. ft2°F
B. BTU/hr. °F. ft
C. BTU/hr. °F
D. BTU/hr. ft

A. Avoid cavitation
B. Avoid frequent priming
C. Create more suction head
D. None of these