Related Questions

The natural convection air cooled condensers are used in
A Domestic refrigerators
B Water coolers
C Room air conditioners
D All of these
A non-dimensional number generally associated with natural convection heat transfer is
A Grashoff number
B Nusselt number
C Weber number
D Prandtl number
Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler
A Increases
B Decreases
C Remain unaffected
D First increases and then decreases
In natural convection heat transfer, the correlating parameter is the
A Graetz number
B Eckert number
C Grashoff number
D Bond number
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 $${\left( {\Delta {\text{T}}} \right)^{\frac{1}{4}}}$$
B $${\left( {\Delta {\text{T}}} \right)^{\frac{1}{2}}}$$
C $${\left( {\Delta {\text{T}}} \right)^{\frac{5}{4}}}$$
D $${\left( {\Delta {\text{T}}} \right)^{\frac{3}{4}}}$$
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
Heat transfer occurs by natural convection because change in temperature causes difference in
A Viscosity
B Density
C Thermal conductivity
D Heat capacity
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 Stantan
D Reynolds
Natural gas recovered along with crude oil from oil wells is called wet natural gas which has a higher __________ compared to the dry natural gas.
A Unsaturated hydrocarbon content
B Calorific value
C Quantity of propane
D Quantity of butane

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