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Jaypee Institute of Information Technology (JIIT) 2008 B.E Test 1 : Statistical Thermodynamics - Question Paper

Monday, 01 April 2013 09:05Web

JAVPKR r.MVERSl n OF INFORMATION TECHNOLOGY .WAKNAGHAT IKS I I FKBRlARV 2008 B.TEC'H IV SEMESTER (BI)

Course Code: 07&41PIIKK.    Max. Marks: 20

Course Name: Statistical Thrrmoihnamict

Course C redits: 4    Max. Time: I hr.

(a)    Out or the following, the physical quantity that relates with first law nf thermodynamics is:

(i) temperature (ii) pressure (iii) energy (iv) do. of moles

(b)    Zeroth law of thermodynamics is:

(i)    kinetic energy nf mokculcs of a gas is zero

(ii)    ideal gas dne* not contain molecules

(iii)    if two system? are separate!) in thermal equilibrium with a third system then they themselves arc in thermal equilibrium

(iv)    absolute zero temperature can not be attained

(c)    A piece of ice is added to a cup containing water, its entropy () increases (ii) decreases (iii) remains unchanged

(d)    For the efficiency of a Carnot's cycle to be maximum

(i)    temperature of the source should be infinity

(ii)    temperature of the sink should be infinity

(iii)    temperature of the source should be zero    (V x 4)

Q2. State and explain Zeroth law of thermodynamics. On the basis of this law introduce the concept of temperature and derive the equation of male uf ihc fluid.    (4)

QJ.    A heat engine working between two temperatures conld convert one-

eighth of the heal supplied into work. If the lower temperature is rcduccd by 95nC, the efficiency is doubled. Find the lower temperature.    (4)

Q4. Consider 1 g of perfect gas occupying volume \ at pressure P and temperature I. Derive the relations for the change in entropy of the gas in terms of P,V and T.P.    (6)

Q5. Calculate the change in entropy on converting a mole nf a gas occupying 20 litres at a pressure of 2x10* N/m1 to occupying 50 litres at pressure of 5xlOJ N/m*. R=8.4 Jmolk and C,=21 Jmolk. (41