  The Galactic transient X-ray binary MAXI~J1836-194 was discovered on 29th
August 2011. Here we make a detailed study of the spectral and timing
properties of its 2011 outburst using archival data of RXTE Proportional
Counter Array instrument. The evolution of accretion flow dynamics of the
source during the outburst through spectral analysis with
Chakrabarti-Titarchuk's two-component advective flow (TCAF) solution as a local
table model in XSPEC. We also fitted spectra with combined disk blackbody and
power-law models and compared it with the TCAF model fitted results. The source
is found to be in hard and hard-intermediate spectral states only during entire
phase of this outburst. No soft or soft-intermediate spectral states are
observed. This could be due to the fact that this object belongs to a special
class of sources (e.g., MAXI~J1659-152, Swift~J1753.5-0127, etc.) that have
very short orbital periods and that companion is profusely mass-losing or the
disk is immersed inside an excretion disk. In these cases, flows in the
accretion disk is primarily dominated by low viscous sub-Keplerian flow and the
Keplerian rate is not high enough to initiate softer states. Low-frequency
quasi-periodic oscillations (QPOs) are observed sporadically although as in
normal outbursts of transient black holes, monotonic evolutions of QPO
frequency during both rising and declining phases are observed. From the TCAF
fits, we find mass of the black hole in the range of $7.5-11~M_\odot$ and from
time differences between peaks of the Keplerian and sub-Keplerian accretion
rates we obtain viscous timescale for this particular outburst $\sim 10$~days.
