A. Colburn
B. Reynolds
C. Prandtl
D. None of these
Related Mcqs:
- The equation, Nst = f/2, is the _____________ analogy?
A. Colburn
B. Reynolds
C. Prandtl
D. None of these - The equation, Nst = (f/2)/[1 + 5 (Npr – 1) √(f/2)], corresponds to ______________ analogy?
A. Von-Karman
B. Reynolds
C. Colburn
D. Prandtl - Dittus-Boelter equation used for the determination of heat transfer co-efficient is valid ___________________?
A. For fluids in laminar flow
B. For fluids in turbulent flow
C. When Grashoff number is very important
D. For liquid metals - Pick out the correct equation ?
A. jH = (St)(Pr)2/3 = f/2
B. jH = (St)(Pr)1/3 = f/2
C. jH = (St)2/3(Pr) = f/2
D. jH = (St)1/3(Pr) = f/2 - Out of the following four assumptions used in the derivation of the equation for LMTD [LMTD = (Δt1 – Δt2)/ln(Δt1/Δt2)], which one is subject to the largest deviation in practice ?
A. Constant overall heat transfer co-efficient.
B. Constant rate of fluid flow
C. Constant specific heat
D. No partial phase change in the system - The Dittus-Boelter equation for convective heat transfer [(i.e. h = 0.023 (K/D) (Re)0.8 (Pr)0.4] cannot be used for________________?
A. Low Reynold’s number
B. Very low Grashoff number
C. Molten metals
D. All A., B. and C. - In the equation Q = UAΔt; Δt is_________________________?
A. Geometric mean temperature difference
B. Arithmetic mean temperature difference
C. Logarithmic mean temperature difference
D. The difference of average bulk temperatures of hot and cold fluids - Dittus-Boelter equation cannot be used for molten metals mainly due to its very low_____________________?
A. Prandtl number
B. Grashoff number
C. Thermal conductivity
D. Viscosity - _____________ equation relates the thermal conductivity of a solid to its temperature ?
A. Antoine
B. Kopp’s
C. Lee’s
D. Kistyakowsky - Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids ?
A. Dittus-Boelter equation
B. Sieder-Tate equation
C. Nusselt equation
D. None of these
