Janardan Rai Nagar Rajasthan Vidyapeeth 2006 B.Tech Electrical Engineering B-tech electrical(THERMODYNAMICS) - Question Paper

BSAE2/BSCH2/BSM2/BSE2/BSMR2/BSMI2/BSMT2 – THERMODYNAMICS-MQP
Duration : three hrs Maximum Marks: 75
Instruction:
1. Question paper is divided into Group A, Group B, and Group B and Group C
2. Each Group is 25 marks
3. Figure to the right in bracket indicate marks.
4. Good Handwriting is expected.

Group A (25 Marks)
`
ans any 3 ques. (Question one is compulsory)

Q.1: discuss heat engine with diagram? (5)
Q.2: What is steam table ? What is its use? (10)
Q.3: What is reversible adiabatic process? (10)
Q.4 What is the difference ranging from internal combustion and external combustion engines? (10)
Q.5. A boiler 3.7 kg of water per kg of coal from feed water at 54.5 0C. to steam at the pressure of 34 bar and temperature of 370oC. Assuming specific heat of superheated steam as 2.6, compute equivalent evaporation/kg of coal. (10)

Group B (25 Marks)

ans any 3 ques. (Question six is compulsory)

Q.6: discuss Bucket calorimeter for measurement of dryness fraction of steam? (5)
Q.7: A fuel has subsequent percentage composition by mass;co2 13.3%;o2 8.35% and N2 77.4% Convert this into volumetric analysis? (10)
Q.8: A carnet engine contains 0.1kg of water During the heat addition process, saturated liquid is converted into saturated vapor. Heat addition occurs at 12Mpa and heat rejection occurs at 30Kpa Determine .? (10)
1) Quality of steam at the end of adiabatic expansion and also at the end of isothermal heat rejection
2) Thermal efficiency of the cycle
3) Heat added per cycle
4) Net work output of the cycle
5) Work ratio
Q. 9. 1 kg of air occupies 0.084 m3 at 12.5 bar and 537oc. It is expanded at a
constant temperature to a final quantity of 0.336m3.Calculate
1. Pressure at end of expansion
2.Workdone during expansion
3.Heat absorbed by air
4.Change of entropy.? (10)
Q. 10.A gas engine has a piston diameter of 150mm and stroke 250mm.The speed of engine explaosions are 90 per minute.The mean effective pressure is 7bar.If the avg. torque on the brake is 140 N-m. obtain indicated power, brake power and mechanical efficiency.? (10)





Group C (25 Marks)

All ques. are compulsory.

Q. 11. (A) Fill in the blanks (Each ques. carries two marks, Total = 10 marks)

(i) Specific mass of a substance is it mass/unit= _____
(ii) _______ provide us indication regaring dryness of wet.steam
(iii)Willan,s line method is also known as _____________
(iv)Irreversible process always outcomes in ______ entropy
(v)Isentropic efficiency of turbine is ________

Q. 11. (B) Multiple option ques. (Each ques. carries two marks, Total = 10 marks)
choose the accurate ans.

(i) Motoring test measures
a. B.P b. I.P c.F.P d. C.V.

(ii) one bar
a. 1x105 N/cm2 c.10x105 N/cm2
b. c.100x105 N/cm2 d.1000x105 N/cm2

(iii)Carnot cycle consist of
a. Two constant quantity and reversible adiabatic process
b. Two isothermal and 2 reversible adiabatic process
c. Two const .pressure and reversible adiabatic process
d. One const volume, 1 const. pressure and 2 reversible adiabatic process

(iv)In a throttling process________ remaines const
a. enthalpy b.Temperature c. Entropy d.None

(v) The process in which heat transfer is equal to the change of enthalpy is known as
a. Const.pressure process b. Const. quantity process
c. Const. quantity process d. Const. Entropy process

Q. 11. (C)Indicate whether subsequent statements are actual or False (Each ques. carries one marks, Total = five marks)

(i) Carnot cycle is practically impossible.
(ii) Frictional power is greater than indicated power.
(iii)Any reversible process can be changed by 2 reversible adiabatic and 1 Isothermal process.
(iv)By two law, Net heat supplied not equal to Net work done.
(v) Composition of air by mass is N2=77%,O2=23%



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Earning:   Approval pending.