# JNTUH B-Tech Mechanical Engineering 2019 Blooms Taxonomy Question Paper of Thermodynamics

JNTU Hyderabad (JNTUH) B-Tech 2019 Question Papers Second Year Second Semester (2-2) R16 Regulation Mechanical Engineering (MECH)

Code No: ME404ES
B.Tech II Year II Semester Examinations, 2019
THERMODYNAMICS
Time: 3 Hours Max. Marks: 75

Note: This question paper contains two parts A and B.
Part A is compulsory which carries 25 marks. Answer all questions in Part A.
Part B consists of 5 Units. Answer any one full question from each unit.

PART A ( 25 Marks)
Question Bloom’s Level  Example L1 And L2

Q1.a) Define intensive and extensive property.     L1
Qb) Explain the concept of thermodynamic equilibrium?   L2
Qc) Define Heat engine and Heat pump.  L1
Qd) Explain the limitations of First law of thermodynamics.  L2
Qe) Explain the similarities between work and heat.  L2
Qf) Demonstrate work done equation for non flow reversible constant pressure process.  L2
Qg) Define mole fraction and volume fraction of a gas constituent in a mixture.  L1
Qh) Explain Dalton’s Law of partial pressure.   L2
Qi) Outline P-V and T-S diagrams of diesel cycle.   L2
Qj) Explain mean effective pressure of otto cycle.   L2

PART B ( 50 Marks)
Question Bloom’s Level  Example L2, L3, L4  And L5

Q2. 0.2m3 of air at 4 bar and 1300C is contained in a system. A reversible adiabatic
expansion takes place till the pressure falls to 1.02 bar. The gas is then heated at constant
pressure till enthalpy increases by 72.5 KJ. Solve: (i) The work done (ii) The index of
expansion, if the above process are replaced by a single reversible polytrophic process
giving the same work between the same initial and final states.L3

OR

Q3. A platinum wire is used as a resistance thermometer. The wire resistance was found to
be 10Ω and 16Ω at ice and steam points respectively and 30Ω at sulphur boiling point
444.60 C. Solve the constants a and b in the equation.
R= RO (1 + aT +bT2 ).
Where T is in 0C. Also find the resistance of wire at 5000 C. L3

Q4. A reversible heat engine operates between two reservoirs at temperature 7000 C and 500
C. The engine drives a reversible refrigerator which operates between reservoirs at
temperatures of 500 C and -250 C. The heat transfer to the engine is 2500KJ and the net
work output of the combined engine refrigerator plant is 400KJ.
(i) Determine the heat transfer to the refrigerant and net heat transfer to the reservoir at
500 C;
(ii) Reconsider (i) given that the efficiency of the heat engine and the C.O.P. of the
refrigerator are each 45 percent of their maximum possible values. L5

OR

Q5. A fluid undergoes a reversible adiabatic compression from 4 bar, 0.3m3 to 0.08m3
according to the law, pv1.25 = constant. Determine: (i) change in enthalpy; (ii) change in
internal energy; (iii) change in entropy; (iv) heat transfer; (v) work transfer. L5
Q6. Steam at a pressure of 5 bar passes in to a tank containing water where it gets condensed.
The mass and temperature in the tank before the admission of steam are 50kg and 200C
respectively. Examine the dryness fraction of steam as it enters the tank if 3kg of steam
gets condensed and resulting temperature of the mixture becomes 400 C. Take water
equivalent of tank as 1.5kg. L4

OR

Q7. Determine the pressure exerted by CO2 in a container of 1.5m3 capacity when it contains
5kg at 270C. (a) Using ideal gas equation (b) Using Vander Wall’s equation. L5
Q8. Prove that the molar analysis is identical with volumetric analysis, and both are equal to
the ratio of the partial pressure to the total pressure. L3

OR

Q9. A vessel of 0.35m3 capacity contains 0.4kg of carbon monoxide (molecular weight = 28)
and 1kg of air at 200C. Determine: (i) The partial pressure of each constituent (ii) The
total pressure in the vessel. L5
Q10.a) Explain the significance of Psychrometric charts. L2
b) Derive an expression for air standard efficiency of otto cycle. L3

OR

Q11.a) Explain the mean effective pressure of diesel cycle. L2
b) The compression ratio in an air standard otto cycle is 8. At the beginning of compression
process the pressure is 1 bar and the temperature is 300K. The heat transfer to the air per
cycle is 1900kj/kg of air. Solve the following:
(a) The pressure and temperature at the end of each process of the cycle.
(b) Thermal efficiency
(c) The mean effective pressure. L3

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