  Role of different extensions of Nambu\textendash Jona-Lasinio (NJL) model
like addition of vector interaction, Polyakov loop extended version (PNJL) and
the entangled PNJL (EPNJL) models on transport coefficients like shear
viscosity, bulk viscosity, electrical conductivity and thermal conductivity are
critically analyzed. We have considered the standard expressions of transport
coefficients, obtained in relaxation time approximation of kinetic theory.
Influence of temperature dependent order parameters on temperature profile of
transport coefficients are analyzed. Causal aspect of massless case to these
different extended components of mean field models are also picturized, where
an approximated lower and upper bound are drawn for shear relaxation time.
