Test: Heat Dissipation From Extended Surface - 1 - Mechanical Engineering MCQ

increase temperature gradient so as to enhance heat transfer

increase turbulence in flow for enhancing heat transfer.

increase surface area to promote the rate of heat transfer.

decrease the pressure drop of the fluid

1 and 2

1,3 and 4

2 only

4 only

maximum lateral surface at the root side of fin

maximum lateral surface towards the tip side of fin

maximum lateral surface near the center of fin

minimum lateral surface near the center of fin

0.2 m

0.25 m

0.5 m

0.75 m

reduce the total weight

accommodate more number of fins

increase the width for the same profile area

improve flow of coolant around the fin

k is small and h is large

k is large and h is also large

k is small and h is also small

k is large and h is small

Fins should be attached on the side where heat transfer coefficients are high.

Effectiveness of fins depend on thermal conductivity only.

Fins must have small thickness for better heat dissipation.

In boiling heat transfer appliances, fins will be very effective.

0

h (t₀ - t_a)

heat escaping from the tip of the fin

heat conducted along the fin length​

convective heat transfer from the fin surface

sum of heat conducted along the fin length and that converted from the surface

fewer, thick

Large, thick

large, thin

fewer, th