,-' .

Q.5 a) It is observed that a run-of-river plant operates as peak load plant with a wcekly loadfactor of 25 % all this capacity being firm capacity. Determine the minimum flow inthe river so that power plant may act as a base load plant .the following data issupplicd:Rated installed capacity of generating plant = 10 MW, operating head = 16 m, plantefficiency = 86 %.If the stream flow is 15 m'ls, Find the daily load factor of theplant.

b) Explain with help of neat diagram the construction and working of a nuclear powerplant.

c) Explain the concept of Fluidized Bed Combustion (FBC) with neat sketch in detail.

Q.6 a) The air in the gas turbinc plant is taken in L.P. compressor at 293 K and l.05 bar andafter compression it is passed through the intercooler whcre its tcmperature isreduced to 300 K .the cooled air is further compressed in H.P. unit and then passed inthe combustion chamber where its temperature is increased to 750 °c by burning thefuel. The combustion products expand in H.P. turbine which runs the compressor andfurther expansion is continued in L.P. turbine which runs the alternator. The gasescoming out from L.P. turbine are used for heating the incoming air from H.P.compressor and then expandcd to atmospherc.Pressure ratio of each compressor ~ 2, isentropic efficiency of each compressor stage~ 82 %, isentropic efficiency of each turbine stage = 82 %, effectiveness of heatexchanger = 0.72, air flow = 16 kg/s, calorific value of fuel ~ 42000 kJlkg K, c, (forgas) = 1.0 kJlkg K, Cp (for gas) = I. I5 kJlkg K, y (for air) =1.4, y (for gas) =1.33.Neglecting the mechanical, pressure and heat losses of the system and fuel mass also.Determine the following:i)The power outputii)Thermal efficiencyiii)Specific fuel consumption

(3 M)

(5 M)

(6 M)

••

Q,l

(4 M) • •(5 M)

(9 M)

(I M)

Maximum marks: 70

(b) Superheated steam(d) Air

T2 = [P2]O.286T, P,

In which one of the following working substances, docs the relation hold good if theprocess takes place with zero heat transfer?

(a) Wet steam(c) Petrol vapour and air mixture

Duration: 3 hours

Question no 1 is compulsoryAttempt any 4 questions out of remaining 5 from Q.2 to Q.6

Dr. Babasaheb Ambedkar Technological University Lonere -Raigad

END SEMESTER EXAMINATION

Class: B. Tech. (Mechanical Engineering)Semester - VIII

Subject: Power Plant Technology (MES02)

Writc only answer out of four options for the following objective questions.1) Match List I with List II and select the correct answer (these pertain to nuclear (I M)

reactors) .List I List IIA. Coolant I. Carbon dioxideB. Control rod 2. ZirconiumC. Poison 3. CadmiumD. Cladding 4. Graphite

5. HafniumCodcs:- ABC DAB C 0

(a) 5 2 3 4 (b) 5 I 3 4(c) I 3 5 2 (d) I 2 5 3

2)

••I

calculate: i) Brake powerii) Brake specific fuel consumptioniii) Brakc thermal efficiency

Draw heat balancc sheet on minute basis.

What factor should be considered while selecting a site for a gas turbine power plant?

State and explain various types of wind mills.

b)

c)

b)

c)

Draw and explain the layout of diesel engine power plant.

Explain with the help of neat diagram working of Boiling Water Reactor (BWR).

(3 M)

(3 1\1)

3) The equivalent evaporation (kglhr) of a boiler producing 2000 kglhr of steam with (I 1\1)enthalpy contcnt of 2426 kJ/kg from feed water at temperature 40°C (liquid enthalpy= 168 kJlkg, enthalpy of vaporisation of water at 100°C = 2258 kJ/kg) is

Assertion (A): The thermal efficiency of a gas turbine plant is low as compared to (I M)that of reciprocating IC engines.Reason (R): In a gas turbine plant, the maximum pressure and temperature are lowwhen compared to those of reciprocating IC engines.

-End of the paper-----.- __4)

(a) 2000 (b) 2149 (c) 1682 (d) 1649

(a) Both A and R are individually true and R is the correct explanation of A(b) Both A and R are individually true but R is not the correct explanation of A(c) A is true but R is false(d) A is false but R is true

10) Which one of the following types of nuclear reactor DOES NOT require a heat (1 M)exchanger?(a) Boiling water (b) Pressurized water (c) Sodium-cooled (d) Gas<ooled

Match List-I (Name of boiler) with List-II (Special features) and select the correctanswer using the codes given below the lists

5)

List-IA. LancashireB. CornishC. LaMontD. Cochran

Code: ABC D(a) 2 5 I 3(c) I 5 2 3

List-III. High pressure water tube2. Horizontal double fire tube3. Vertical multiple fire tube4. Low pressure inclined water tube5. Horizontal single fire tube

ABC D(b) 2 4 3 I(d) 5 4 I 3

(I M)

• • I

Q.2 a)

b)

The incremental fuel costs for two generating units 1 and 2 of a power plant aregiven by following equations:

dF,/dP, = 0.07 P, + 24dF';dP,= 0.075 P, + 22

Where F is fuel cost in rupees per hour and P is power output in MW. Determine:i) The economic loading of the two units when the total load supplied by the powerplants is 180 MW.ii) The loss in the fuel cost per hour if the load is equally shared by both units.

A input output curve of a 10MW station is expressed as follows:1=4 xlO' (10 + 8L +OAL')

Where I is in kJlhour and L is in megawatts.i) Without plotting any curve find the load at which the maximum efficiency occurs.ii) Find increase in the input required to increase station output from 3 to 5 MW bymeans of the input-output curve and also by incremental rate curve.

(5M)

(5 M)

6) Consider the following statements: (1 M)I. Inter<ooling is effective only at lower pressure ratios and high turbine inlettemperatures.2. There is very little gain in thermal efficiency when inter<ooling is used withoutthe benefit of regeneration3. With high values of'y' and Cp of the working fluid, the net power output of Braytoncycle will increase.(a) I, 2 and 3 are correct (b) I and 2 are correct(c) 1 and 3 are correct (d) 2 and 3.are correct.

7) Ifk is the ratio of the rate of production of neutrons to the rate ofloss of neutrons, thereactor is called a critical reactor, when(a) k= 0 (b) O<k<1 (c) k = I (d) k> I

8) Consider the following features for a gas turbine plant:I. Intercooling 2. Regeneration . 3. ReheatWhich of the above fcatures in a simple gas turbine cycle increase the work ratio?(a) 1,2 and 3 (b) Only 1 and 2 (c) Only 2 and 3 (d) Only I and 3

A steam plant has the boiler efficiency of 92%, turbine efficiency (mechanical) of94%, generator efficiency of 95% and cycle efficiency of 44%. If 6% of thegenerated power is used to run the auxiliaries, the overall plant efficiency is

In a trial on single cylinder oil engine working on a dual cyclc, the following (7M)observations were made:Compression ratio = 15, Oil consumption = 10.2 kglhr , Calorific value of fuel =43890 kJlkg , Air consumption =3.8 kg/min, Speed = 1900 r.p.m, Torque on thebrake drum=186 N-m, Quantity of water used = 15.5 kg/min, Temperaturerise=360c,Exhaust gas temperature =410 °c ,Room temperature =20 °c, cp for exhaustgases= 1.17 kJ/kg k

Explain In-plant handling of coal in detail. (4 M)

What is spillways? Explain any three types of spillways? (4 M)

e) Explain briefly the following tariff: (2 M)i) Straight meter rateii) Block meter rate

d) Explain ways and means to store and dispose nuclear waste. (3 M)

Q.3 a) The peak load on a 50 MW power station is 39 MW. It supplies power through four (7 M)transformers whose connected loads are 17, 12, 9 and 10 MW. The maximumdemand on these transformers are 15, 10, 8 and 9 MW respectively. If the annualload factor is 50 % and the plant operating for 65 % of the period in a year, find outthe following:I) Average load on the station2) Energy supplied per year3) Demand factor4) Diversity factor5) Plant station use factor

(1 M) • •(1 M)

b)

e)

(I M) Q.4 a)

(d) 30%(c) 45%(b) 39%(a) 34%

9)