A. Re0.5, Re0.8
B. Re0.8, Re-0.5
C. Re0.8, Re0.5
D. Re-0.8, Re0.5
Related Mcqs:
- Nusselt number is related to Grashoff number (Gr) in turbulent & laminar flow respectively, in respect of free convection over a vertical flat plate as_________________?
A. Gr0.25, Gr
B. Gr0.25, Gr0.33
C. Gr, Gr0.25
D. Gr0.33, Gr0.25 - Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the___________________?
A. Length of the pipe
B. Diameter of the pipe
C. Density of the fluid
D. Velocity of the fluid - The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge) ?
A. x1.5
B. x0.8
C. x-1.5
D. x-0.8 - Reynolds number of a fluid flowing in a circular pipe is 10,000. What will be the Reynolds number when the fluid velocity is decreased by 30% & the pipe diameter is increased by 30% ?
A. 9,100
B. 13,000
C. 7,000
D. 2,550 - Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of ?
A. Grashoff number
B. Grashoff number & Reynolds number
C. Reynolds number
D. Grashoff number & Prandtl number - The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be_______________?
A. Parabolic
B. Hyperbolic
C. Straight line
D. None of these - The friction factor for the turbulent fluid flow in a rough pipe does not depend upon the_________________?
A. Pipe roughness & pipe diameter
B. Fluid velocity
C. Type of flowing fluid
D. Both B. & C. - The pressure drop per unit length for laminar flow of fluid through a long pipe is proportional to (where, A = cross-sectional area of the pipe & D = Diameter of the pipe) ?
A. A
B. D
C. 1/A
D. 1/A2 - Nusselt number/Biot number varies___________________?
A. Inversely with thermal conductivity
B. Directly with heat transfer co-efficient
C. Directly with thermal conductivity
D. Inversely with the dimension of the solid - Melting point & boiling points of liquid oxygen are respectively – 218.8°C & – 183°C, while the same for liquid nitrogen is – 210°C & – 195.8°C respectively. The difference in melting points of liquid oxygen & liquid nitrogen is not equal to 8.8 ?
A. °C
B. °F
C. °K
D. °R
