**ME6301 Engineering Thermodynamics Important Questions Nov Dec 2017 Exam**

**ME6301 Engineering Thermodynamics** Important Questions Nov Dec 2017 Part B & Part C Important Questions

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**Anna University Exams Nov / Dec 2017 – Regulation 2013**

**Important Questions – 3rd Semester BE/BTECH**

**ME6301- ENGINEERING THERMODYNAMICS**

**Unit 1**

1. 1. A piston and cylinder machine consists of a fluid system which passes through a complete cycle of four process.

During the cycle the sum of all heat transfer is -170 kJ. The system completes 100 cycles per minute. Complete the

following Table showing the method for each item and compute the net rate of work output in KW

2. 2 5kg of air at 400 C and 1 bar is heated in reversible non-flow constant pressure until the volume is doubled.

Find (a) change in volume (b) work done (c) change in internal energy and (d) change in enthalpy.

3. 0.25kg of air at a pressure of 1 bar occupies as volume of 0.3m3

. if this air expands isothermally to a volume of 0.9m3

Find (i) the initial temperature, (ii) the final temperature (iii) external work done, (iv) Heat absorbed by the air, (v)

change in internal energy. Assume R=0.29kJ/kg K.

4. 1.5kg of certain gas at a pressure of 8 bar and 200C occupies the volume of 0.5 m3

. It expands adiabatically to a

pressure of 0.9 bar and volume 0.73 m3

. Determine the work done during the process, gas constant, ratio of the

specific heats, values of two specific heats, change in internal energy and change in enthalpy.

5. A cylinder contains 1 m3 of gas at 100 kPa and 1000C, the gas is polytropically compressed to a volume of 0.25 m3

, the

final pressure is 600kPa. Determine (a) mass of the gas (b) the value of index ‘n’ for compression (c) change in internal

energy of the gas (d) heat transferred by the gas during compression. Assume R=0.287 kJ/kg and 1.4.

6. A steam turbine operates under steady flow conditions receiving steam at the following state: Pressure 15 bar.

Specific volume 0.17m3

/kg internal energy 2700 KJ/kg velocity 100 m/s. The exhaust of steam from the turbine is at

0.1bar with internal energy 2175 KJ/kg. specific 15 m3

/kg and velocity 300 m/s. The intake is 3 m above the exhaust.

The turbine develops 35 kW and heat loss over the surface of turbine is 20 KJ /kg. Determine the steam flow rate

through the turbine.

7. A reciprocating air compressor takes in 2 m3/min air at 0.11 MPa, 293 K which it delivers at 1.5 MPa, 384 K to an after

cooler where the air is cooled at constant pressure to 298 K. The power absorbed by the compressor is 4.15 kW.

Determine the heat transfer in (i)the compressor (ii) the cooler. State your assumptions

**Unit II**

1. A heat engine is used to drive a heat pump. The heat transfer from the heat engine and from the heat pump is used

to heat the water circulating through the radiators of building. The efficiency of the heat engine is 27% and COP of

the heat pump is 4. (i) Draw the neat diagram of the arrangement and (ii) evaluate the ratio of heat transfer to the

circulating water to the heat transfer to the heat engine.

2. A carnot heat engine takes heat from an infinite reservoir at 5500C. Half of the work delivered by the engines used to

run generator and the other half if used to run heat pump which takes heat at 2750C and rejects it at 4400C. Express

the heat rejected at 4400C by the heat pump as % of heat supplied to the engine at 5500C. If the operation of the

generator is 500kW, find the heat rejected per hour by the heat pump at 4400C.

3. 0.2kg of air at 1.5bar and 27 C is compressed to a pressure o 15 bar according to the law PV1.25= Constant. Determine

work done on or by air, eat flow to or from the air, increase or decrease in entropy.

4. Air is closed vessel of fixed volume 0.15m3

, exerts pressure of 12bar at 250 C. If the vessel is cooled so that the

pressure falls to 3.5 bar, determine the final temperature, heat transfer and change of entropy.

5. Two reversible heat engines A and B are arranged in series. A rejecting heat directly to B. Engine receives 200kJ at a

temperature of 4210C from hot source, while engine B is in communication with a cold sink at a temperature of

4.4oC. If the work output of a A is twice that of B, Find:1. The intermediate temperature between A and B. 2. The

efficiency of each engine. 3. The heat rejected to the cold sink.

6. An aluminium block (cp =400J/kgK) with a mass of 5 kg is initially at 40°C in room air at 20°C. It is cooled reversibly by

transferring heat to a completely reversible cyclic heat engine until the block reaches 20°C. The 20°C room air serves

as a constant temperature sink for the engine. Compute (1) The change in entropy for the block, (2) The change in

entropy for the room air, (3) The work done by the engine.

7. One kg of air is contained in a piston cylinder assembly at 10 bar pressure and 500 K temperature. The piston moves

outwards and the air expands to 2 bar pressure and 350 K temperature. Determine the maximum work obtainable.

Assume the environmental conditions to be 1 bar and Also make calculations for the availability in the initial and

final states.

**Unit III**

1. A closed vessel of 0.2m3

contains steam at 1 MP and temperature 2500C. If the vessel is cooled so the pressure falls

to 350 kPa. Determine the final temperature, heat transfer and change of entropy during the process

2. Steam at 10 bar and 0.85 dry expands according to the law pv1.2 = C to a final pressure of 1 bar. Determine a) final

volume b) final enthalpy

3. Steam at 15 bar and 3000C is expanded hyperbolically to a pressure of 5 bars. Calculate change in internal energy and

work done during the process.

4. 150 kg / s steam at 25 bars and 300oC expands isentropically in a steam turbine to 0.3 bars. Determine the

power output of the turbine.

5. Steam at 30 bar and 350oC is expanded in a non flow isothermal process to a pressure of 1 bar. The temperature and

pressure of the surroundings are 25oC and 100 kpa respectively. Determine the maximum work that can be obtained

from this process per kg of steam. Also find the maximum useful work and change in availability.

6. Consider a steam power plant operating on the ideal Rankine cycle. Steam enters the turbine at 3 MPa and 623 K

and is condensed in the condenser at a pressure of 10 kPa. Determine (i) the thermal efficiency of this power plant,

(ii) the thermal efficiency if steam is superheated to 873 K instead of 623 K, and (iii) the thermal efficiency if the

boiler pressure is raised to 15 MPa while the turbine inlet temperature is maintained at 873 K

7. In a reheat cycle, the initial steam pressure and the maximum temperature are 150 bar and 550°C respectively. If the

condenser pressure is 0.1 bar and the moisture at the condenser inlet is 5%, and assuming ideal processes, determine

(i) the reheat pressure, (ii) the cycle efficiency, and (iii) the steam rate.

**Unit IV**

1. Derive the T-ds relations.

2. Derive the equation for Maxwell’s relations.

3. Derive the Clausius Clapeyron equation.

4. Explain and derive the Joule –Thomson coefficient.

5. A Vessel of volume 0.28 m3 contain 10 kg of air at 302K. determine the pressure exerted by the air using 1. Perfect

gas equation 2. Vander Waals equation 3. Generalised compressibility chart. [Tale Critical temperature of air is 132.8

K; Critical pressure of air is 37.7 bar]

6. Consider an ideal gas at 303K and 0.86 m3/kg. As a result of some disturbance the state of the gas changes to 304 K

and 0.87 m3/kg. Estimate the change in pressure of the gas as the result of this disturbance.

7. Verify and validate of Maxwell’s Relation, (ds/dp)T = – (dv/dT)p for steam at 300oC and 500kPa.

**Unit V**

1. An air conditioning unit receives an air – water vapour mixture at 101 kpa, 35oC and 80% relative humidity. a)

The dew point b) The humidity ratio c) The partial pressure of air d) The mass fraction of water vapour.

2.Air has a dry bulb temperature of 25 C and wet bulb temperature of 15 C. If the barometer reads 1 bar,

calculate 1. Vapour pressure Specific humidity 3.Saturation ratio 4.Relative humidity 5.Drew point

temperature 6.Vapour density 7.Enthalpy of mixture.

2. An air – water vapour mixture at 30oC and me am has a relative humidity of 60 per cent. Obtain 1. The

humidity ratio 2. The specific volume 3. The enthalpy in KJ / kg dry air 4. The dew – point. Using

psychrometric chart.

3. Air is at 37 C dry bulbs and 15% relative humidity. The air is to be cooled by evaporation cooling until the

relative humidity is 60%. Determine 1. The final temperature 2. For 0.5 m3

/s of air, the water required.

4. Moist air at 32 C and 60% relative humidity enters the cooling coil of a dehumidifier with a flow rate of

115kg air/min. The air leaves saturated at 10 C calculated the condensate removed and the tons of

refrigeration required.

5. The atmospheric air has a dry bulb temperature of 20 C and specific humidity of 0.0095 kg/kg of dry air.

If the barometer reads 760mm of Hg. Determine 1.Partial pressure of vapour 2. Relative humidity 3.

Dew point temperature.

6. Saturated air at 20oC at a rate of 1.167 m3

/sec is mixed adiabatically with the outside air at 35oC and 50%

relative humidity at a rate

0. 5 m3

/sec. Assuming adiabatic mixing condition at 1 atm. Determine specific humidity, relative humidity,

and dry bulb temperature and volume flow rate of the mixture .

8. An air conditioning system is designed under the following condition: Outdoor condition-32oC DBT and 75%

RH Required Indoor

condition- 220C DBT and 70 % RH Amount of free air circulated- 200 m3

/min Coil dew point temperature140C.

The required condition is first achieved by cooling and dehumidifying and then by heating. Calculate

the following i) Capacity of cooling coil in Tonne ii) Capacity of heating coil in KW iii) Mass of water vapour

removed in kg/s .

9. Air at 40°C DBT and 27°C WBT is to be cooled and dehumidified by passing it over a refrigerant coil to give

a final condition of 15°C and 90% RH. Find the amounts of heat and moisture removed per kg of dry air.

10. Explain the process of heating and humidification process.

11. Explain with an example evaporative cooling .

12. A Mixture of 2 kg Oxygen (M=32kg/kgmol) and 2kg argon (m=40 Kg/kmd) is present in an insulated piston in

cylinder arrangement at 100kpa, 300K. The piston now compresses the mixture to half of its initial volume.

Find the final pressure, temperature and piston work, assume c, for oxygen and argon for oxygen and argon

as 0.6618kj/kgk and 0.3122KJ/kgK respectively.

Questions Are Expected for University Exams This May or may Not Be Asked for Exams

**ME6301- ENGINEERING THERMODYNAMICS – Important Questions – Download Now ( Updated ) >>**

**Semester : **03

**Department : ** Mechanical Engineering (MECH)

**Year :** Second Year (II Year)

**Regulation** : 2013

**Subject Code** : ME6301

**Subject Name **: Engineering Thermodynamics

**Content :** ME6301 Engineering Thermodynamics – Important Part A 2 Marks Questions and Important Part B 16 Mark Questions

ME6301- ENGINEERING THERMODYNAMICS **Questions Bank** – Download ( **Update soon** ) >>

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