A fin has 5 mm diameter and 100 mm length. The thermal conductivity of fin material is 400 Wm-1K-1. One end of the fin is maintained at 130ºC and its remaining surface is exposed to ambient air at 30ºC. If the convective heat transfer coefficient is 40 Wm-2k-1, the heat loss (in W) from the fin is

A fin has 5 mm diameter and 100 mm length. The thermal conductivity of

1.	A fin has 5 mm diameter and 100 mm length. The thermal conductivity of fin material is 400 Wm-1K-1. One end of the fin is maintained at 130ºC and its remaining surface is exposed to ambient air at 30ºC. If the convective heat transfer coefficient is 40 Wm-2k-1, the heat loss (in W) from the fin is
A.	0.08
B.	5
C.	7
D.	7.8
Answer» C. 7

Discussion

No Comment Found

Related MCQs

On a heat transfer surface, fins are provided to
A steel rod (k = 30 W/m degree) 1 cm in diameter and 5 cm long protrudes from a wall which is maintained at 10 degree Celsius. The rod is insulated at its tip and is exposed to an environment with h = 50 W/m2 degree and t a = 30 degree Celsius. Calculate the rate of heat dissipation
In order to achieve maximum heat dissipation, the fin should be designed in such a way that has a
A steel rod (k = 30 W/m degree) 1 cm in diameter and 5 cm long protrudes from a wall which is maintained at 10 degree Celsius. The rod is insulated at its tip and is exposed to an environment with h = 50 W/m2 degree and t a = 30 degree Celsius. Calculate the fin efficiency
It is said that fins can take a variety of forms(i) Longitudinal fins of rectangular cross section attached to a wall(ii) Cylindrical tubes with radial fins(iii) Conical rod protruding from a wallIdentify the correct statement
Common applications of finned surfaces are with(i) Electrical motors(ii) Economizers for steam power plant(iii) Convectors for steam and cold water heating systems(iv) Cooling coilsIdentify the correct option
A very long copper rod 20 mm in diameter extends horizontally from a plane heated wall maintained at 100 degree Celsius. The surface of the rod is exposed to an air environment at 20 degree Celsius with convective heat transfer coefficient of 8.5 W/m2 degree. Workout the heat loss if the thermal conductivity of copper is 400 W/m degree
A plate fin of length L = 1.5 cm and thickness 2 mm has efficiency of____ (if k = 210 W/m-K, h = 285 W/m2K)
An infinitely long pin fin, attached to an isothermal hot surface, transfers heat at a steady rate of Q̇1 to the ambient air. If the thermal conductivity of the fin material is doubled, while keeping everything else constant, the rate of steady-state heat transfer from the fin becomes Q̇2. The ratio Q̇2/Q̇1 is
A fin has 5 mm diameter and 100 mm length. The thermal conductivity of fin material is 400 Wm-1K-1. One end of the fin is maintained at 130ºC and its remaining surface is exposed to ambient air at 30ºC. If the convective heat transfer coefficient is 40 Wm-2k-1, the heat loss (in W) from the fin is

Discussion

No Comment Found

Related MCQs

Reply to Comment