GATE (TF) Textile 2012 Question Paper Solution | GATE/2012/TF/52

Question 52 (Textile Engineering & Fibre Science)

The thermal conductivity of a nonwoven fabric is given by

    \[\lambda = 0.03+0.00005\rho + \frac{0.15}{\rho}\]


where \lambda is the thermal conductivity of the fabric is W/(m.K), \rho is the bulk density of the fabric in kg/m3, and \rho \; \epsilon \left [ 10,200 \right ].

Thermal conductivity is minimum when the bulk density is approximately

(A)10
(B)20
(C)55
(D)200
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