A steel rod (k = 30 W/m degree) 1 cm in diameter and 5 cm long protrud – McqOptions

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1.	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
A.	56.57%
B.	66.57%
C.	76.57%
D.	86.57%
Answer» C. 76.57%

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