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Mechanical Engineering · Q105

Heat And Mass Transfer

Engineering and GATE · Mechanical Engineering · question 105

Q105

An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK). The cable is to be located in air (h = 6 W/m2). The critical thickness of insulation will be

A.
25 mm
Answer
B.
40 mm
C.
160 mm
D.
800 mm

Answer: Option A

Solution

Answer: Option A
Solution:
Critical radius of insulation for cylinder = k/h.
K = thermal conductivity of cylinder
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