A. Grashoff number
B. Peclet number
C. Reynolds number
D. Prandtl number
Related Mcqs:
- Fluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the_________________?
A. Existence of thermal boundary layer
B. Temperature gradient produced due to density difference
C. Buoyancy of the bubbles produced at active nucleation site
D. None of these - Nusselt number is a function of Prandtl number and ______________ number of fluid in natural convection heat transfer?
A. Grashoff
B. Biot
C. Stanton
D. Reynolds - In natural convection heat transfer, the correlating parameter is the_______________________?
A. Graetz number
B. Eckert number
C. Grashoff number
D. Bond number - Heat transfer occurs by natural convection because change in temperature causes difference in__________________?
A. Viscosity
B. Density
C. Thermal conductivity
D. Heat capacity - The rate of heat transfer from a vertical plate by natural convection depends upon the temperature differences (ΔT) between wall and outside bulk. The proportionality is given as______________?
A. (ΔT)1/4
B. (ΔT)1/2
C. (ΔT)5/4
D. (ΔT)3/4 - Heat transfer by natural convection is enhanced in system with__________________?
A. High viscosity
B. High co-efficient of thermal expansion
C. Low temperature gradients
D. Low density change with temperature - Critical value of the _____________ number governs the transition from laminar to turbulent flow in free convection heat transfer?
A. Grashoff
B. Reynolds
C. Both ‘a’ & ‘b’
D. Prandtl & Grashoff - In forced convection, the Nusselt number is a function of ____________________?
A. Re and Pr
B. Re and Gr
C. Pr and Gr
D. Re and Sc - In forced convection, the heat transfer depends on _______________?
A. Re, Pr
B. Re, Gr
C. Mainly Gr
D. Re only - 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
