Addition of fin to the surface increases the heat transfer if $\sqrt{hA/kP}$ is

A fin length $\mathcal{l}$ protrudes from a surface held at temperature t₀ greater than the ambient temperature t_a. The heat dissipation from the free end of the fin is assumed to be negligible. The temperature gradient at the fin tip ${\left(\frac{dt}{dx}\right)}_{x=\mathcal{l}}$is

The efficiency of a fin with insulated tip is

Consider the following statements pertaining to large heat transfer rate using fins:

1. Fins should be used on the side where heat transfer coefficient is small.

2. Long and thick fins should be used.

3. Short and thin fins should be used.

4. Thermal conductivity of fin material should be large.

Which of these statements are correct?

Assertion (A): In a liquid-to-gas heat exchanger fins are provided in the gas side.

Reason (R): The gas offers less thermal resistance than liquid.

In order to achieve maximum heat dissipation, the fin should be designed in such a way that:

Usually fins are provided to increases the rate of heat transfer, but fins also act as insulation. Which one of the following non-dimensional numbers decides this factor?

Fins are used to increase the heat transfer from surface by

Heat transfer occur when there is

Conduction occur through

Thermal conductivity of gases depends upon

Analyze the following statements

1. The heat loss from an insulated pipe reaches maximum when outside radius of insulation is equal to ratio of thermal conductivity to the surface heat transfer coefficient.

2. On increasing thickness of insulation, heat loss decreases.

3. On increasing thickness of insulation heat loss 1^st increases reaches maximum and then decreases.

Which of the following statements are correct.

A sphere at higher temperature is immersed in a fluid, the heat transfer coefficient is h, then  the heat transfer rate is…..

Given temperature difference is $\Delta T$and radius of sphere is r.

A composite wall consisting of three materials having thermal conductivities $k_1,k_2,k_3$thickness of the each layer is `b` unit. Assume area of the wall `A`. find equivalent thermal conductivity of the wall.

Consider the following statement the  about Fourier heat conduction.

1. Steady-state conditions.

2. Constant Value of thermal conductivity.

3. Uniform temperature at the wall surface.

4. One-dimensional heat flow.

Which of the following are correct?

Which of the following is correct about critical radius of insulation?

Cork is good insulator as it has

In which of the following steady state heat transfer occur

Metals are good conductor of heat due to

Heat flowing from one face of a wall to the other face of a wall depends upon

Which of the following has maximum thermal conductivity

Thermal diffusivity

A plane wall is 25 cm thick with an area of 1 m² , and has thermal conductivity of 0.5 w/mk. If a temperature difference of 60 ⁰ C is imposed across it, what is the heat flow?

Thermal conductivity of diamond is…..

Which one is having lowest thermal conductivity?