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We study spectral and temporal properties of Galactic short orbital periodtransient black hole XTE J1118+480 during its 2005 outburst using archival dataof RXTE PCA and HEXTE instruments in the combined energy range of $3-100$ keV.Spectral analysis with the physical two-component advective flow (TCAF) modelallows us to understand the accretion flow properties of the source. We foundthat this outburst of XTE J1118+480 is an unconventional outburst as the sourcewas only in the hard state (HS). Our spectral analysis suggests that during theentire outburst, the source was highly dominated by the low angular momentumsub-Keplerian halo rate. Since the source was active in radio throughout theoutburst, we make an effort to estimate X-ray contribution of jets in totalobserved X-ray emissions from the spectral analysis with the TCAF model. Thetotal X-ray intensity shows a similar nature of evolution as of radio and jetX-ray fluxes. This allowed us to define this `outburst' also as a jet dominated`outburst'. Total X-ray flux also found to subside when jet activitydisappears. Our detailed spectral analysis also showed that although the sourcewas only in the HS during the outburst, in the late declining phase spectrumbecame slightly softer due to the slow rise in the Keplerian disk rate.

Accretion Flow Properties of XTE J1118+480 During Its 2005 Outburst