Karnataka State Open University (KSOU) 2011 B.Tech Mechanical Engineering- Engineering Thermodynamics - Question Paper
III Semester B.Tech. in Mechanical Engineering Examination, August 2011 ENGINEERING THERMODYNAMICS
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Time : 3 Hours Max. Mrks : 75
Instruction : Answer any five questions from Part A, and Part B
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(5x5=25)
PART - A
Answer any five questions :
1) Explain the first law of thermodynamics with example.
2) What are the modem thermodynamics ?
3) Write a short note on P-V and T-S diagrams.
4) Differentiate reversible process and irreversible process.
5) Write the differences between VCRS and VARS.
6) Expand and explain PFAT.
7) Explain the Lamberts law.
8) Explain the types of ideal gases.
PART - B
Answer any five questions : (5x10=50)
9) Establish the inequality of Clausius.
10) A camot heat engine receives 500 kJ of heat per cycle from a high-temperature heat reservoir at 652C and rejects heat to a low-temperature heat reservoir at 30C. Determine :
a) The thermal efficiency of this Camot engine.
b) The amount of heat rejected to the low-temperature heat reservoir.
P.T.O.
11) An Otto cycle having a compression ratio of 9:1 uses air as the working fluid. Initially P, = 95 kPa, T( = 17C, and V, = 3.8 liters. During the heat addition
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process, 7.5 kJ of heat are added. Determine all T's.P's rj*, the back work
ratio, and the mean effective pressure.
%
12) A room for four persons has two fans, each consuming 0.18 kW power and three 100 W lamps. Ventilation air at the rate of 0.0222 kg/sec enters with an enthalpy of 84 kJ/kg and leaves with an enthalpy of 59 kJ/kg. If each person puts out heat at the rate of 0.175 kJ/sec, determine the rate at which heat is to be removed by a room cooler, so that a steady state is maintained in the room.
13) Explain the principal parts of a simple vapour compression refrigeration system.
14) Explain the heat transfer by convection with example.
15) 1 kg of air at 313 K dry bulb temperature and 50% relative humidity is mixed with 2 kg of air at 293 K dry bulb temperature and 293 K dew point temperatue. Calculate the temperature and specific humidity of the mixture.
16) Show the following processes on a skeleton psychrometric chart:
a) Dehumidification and cooling
b) Heating and humidification.
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| Earning: Approval pending. |
