ME 6301 Engineering Thermodynamics Nov Dec 2014
ME 6301 Engineering Thermodynamics Nov Dec 2014
ME 6301 Engineering Thermodynamics Nov Dec 2014
l~uestion
Paper Code :
91631
PART B - (5 x 16 = 80 marks)
11.
(a)
(i)
(li)
(b)
12.
(a)
(b)
(4)
(i) State and prove Clausius inequality.
(ii) A reversible heat engine operates between two resewairs a t
temperature of 600C and 40C. The engine drives a reversible
refrigerator which operates between reservoirs at temperature of
40C and -20% The heat transfer to the heat engine is 2000 k J
and the network output of the combined engine refrigerator plant is
360 kJ. (1) Evaluate the heat transfer to the refrigerant and the net
heat transfer to the reservoir at 40C. (2) Reconsider (1) given that
the efficiency of the heat engine and the COP of the refrigerator are
each 40% of their maximum possible values.
(12)
Or
(i)
Briefly discuss about the concept of entropy.
(6)
(ii) Liquid water of mass 10 kg and temperature 20% is mixed
with 2 kg of ice at -5C till equilibrium is reached a t 1 atm
pressure. Find the entropy change of the system. Given : C, of ice =
(a)
(1 0)
(b)
14.
(a)
1.4 respectively.
(b)
(i)
(8)
(ii) Deduce the expression for Joule-Thomson coefficient and draw the
(8)
inversion curve.
15.. (a)
(b)
(i)
(8)
(ii)
A shng psychrometer reads 35C DBT and 30C WBT. Find the
humidity ratio, relative humidity, dew point temperature, specific
volume, and enthalpy of air.
(8)