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Heat transfer occurs by natural convection because change in temperature causes difference in

Q.  
Heat transfer occurs by natural convection because change in temperature causes difference in


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Answer :   Option: B


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More Questions Heat and Mass Transfer:

Q.  
The Grashoff number is defined as the ratio of the

A. buoyancy to inertial forces

B. buoyancy to viscous forces

C. inertial to viscous forces

D. buoyancy to surface tension forces


Answer & Explanation

Q.  
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


Answer & Explanation

Q.  
Thermal conductivity of a gas at low density, ______ with increase in temperature.

A. Decreases

B. Increases

C. Remains unchanged

D. May increase or decrease, depends on the gas


Answer & Explanation

Q.  
Slab made up of carbon steel is initially at a temperature of 500°C (Ti) and it is exposed to air at 30°C (Ta). The thickness of the slab is 1 cm (L). What will be the temperature of the slab after one minute (t)? Assume that the convective heat transfer coefficient (h) on the surface of the slab is 40 W/m2K.

A. 0.832

B. 0.899

C. 0.841

D. 0.862


Answer & Explanation
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