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Recent questions tagged heat-transfer

A cylinder of radius r and thermal conductivity $\;K_{1}\;$ is surrounded by cylindrical shell of inner radius r and outer radius 2r and thermal conductivity $\;K_{2}\;$ . The effective thermal conductivity when ends of combined system $\;t_{1}\;$ and $\;t_{2}\;$ under steady state is

asked Mar 31, 2014 by yamini.v

1 answer

If the temperature of a body is raised by $\;5 \%\;$ . Find increase in radiated energy .

asked Mar 26, 2014 by yamini.v

1 answer

Find the temperature at which a black body radiates energy at the rate of $\;5.67\;W/cm^{2}\;$

asked Mar 26, 2014 by yamini.v

1 answer

Two spheres of same material and radii 4 m and 1 m at temperature 1000 K and 2000 K . Find the ratio of the energies radiated by them in one second .

asked Mar 26, 2014 by yamini.v

1 answer

The maximum emission wavelength at temperature 2000 K is $\;4 \mu m\;$ . The maximum wavelength corresponding to temperature 2400 K will be

asked Mar 25, 2014 by yamini.v

1 answer

Two identical rods A and B when joined in series conduct heat at a rate of 4 w at steady state . If they are connected in parallel , they conduct heat at rate of

asked Mar 25, 2014 by yamini.v

1 answer

The ends of a metal rod of length 60 cm are showing the steady temperature $\;70^{0}C\;$ and $\;30^{0}C\;$ is the steady state . The temperature of the rod at a distance of 15 cm from hot end is

asked Mar 25, 2014 by yamini.v

1 answer

Five rods of the same dimension are arranged as shown . AB are maintained at different temperatures . No Heat flows through the central rod ; then

asked Mar 25, 2014 by yamini.v

1 answer

Two metal rods have their thermal conductivities $\;K_{1}\;$ and $\;K_{2}\;$ in the ratio 3 : 2 so that their thermal resistance are the same . Then their lengths are is the ratio ( Area of C .S . are the same )

asked Mar 25, 2014 by yamini.v

1 answer

A square iron plate of side 3 cm and thickness 8 mm has its opposite faces at $\;100^{0}C\;$ and $\;60^{0}C\;$ . If K=0.16 C.G.S units , then the amount of heat flow through the rod is 1 minute is

asked Mar 25, 2014 by yamini.v

1 answer

The temperature gradient in a rod 0.5 m long is 80 c/m . The temperature of the hot end of the rod is $\;30^{0}C\;$. Then the temperature of the cooler and is

asked Mar 24, 2014 by yamini.v

1 answer

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