8/12/2019 12057 Electrical

1/7

12057

111223 Hours / 100 Marks Seat No.

P.T.O.

Instructions (1) All Questions are compulsory.

(2) Answer each next main Question on a new page.

(3) Illustrate your answers with neat sketches wherever

necessary.

(4) Figures to the right indicate full marks.

(5) Assume suitable data, if necessary.

(6) Use of Non-programmable Electronic Pocket

Calculator is permissible.

(7) Mobile Phone, Pager and any other Electronic

Communication devices are not permissible in

Examination Hall.

(8) Use of Steam tables, logarithmic, Molliers chart is

permitted.

Marks

1. Attempt any TEN of the following: 20

a) What is meant by power system? Draw the block diagram of

power system.

b) Classify and list out the various sources of electrical energy.

c) Name any two thermal power stations in India and also state

their installed capacity.

8/12/2019 12057 Electrical

2/7

12057 [ 2 ]

Marks

d) State the function of economizer of a thermal power station.

e) What is nuclear fission?

f) What are the fields of application of diesel power stations?

State any four.

g) How will you do the maintenance of diesel power stations?

Explain in brief.

h) Write down any four merits of wind energy conversion.

i) State four different applications of solar energy.

j) What is Diversity factor?

k) What is meant by base load plant? Give an example for the

same.

l) Compare thermal and hydro power stations with reference to

the following points:

(i) initial cost

(ii) efficiency

(iii) maintenance cost

8/12/2019 12057 Electrical

3/7

12057 [ 3 ]

Marks

2. Attempt any FOUR of the following: 16

a) Draw steam generating plant of a thermal power stationshowing boiler, superheater, economiser and air preheater. Also

explain its working in brief.

b) Compare conventional and non-conventional energy sources on

the basis of:

(i) Availability

(ii) Cost of fuel

(iii) Amount of power generated

(iv) Space required

c) What are the factors to be considered while selecting site for

thermal power station? Explain in brief.

d) With the help of neat diagram, explain the construction and

working of nuclear reactor.

e) Classify coal and explain each type in brief.

f) Draw the block diagram of nuclear power station and mark

all the components.

3. Attempt any FOUR of the following: 16

a) Write down any two advantages and any two disadvantages of

nuclear power plant.

b) State the functions of:

(i) Air preheater

(ii) Super heater of a thermal power plant.

P.T.O.

8/12/2019 12057 Electrical

4/7

12057 [ 4 ]

Marks

c) What are the functions of the following parts of a nuclear

reactor.

(i) Reflector

(ii) Control rods

(iii) Coolant

(iv) Shielding

d) Describe coal and ash handling plant of a thermal power

station in detail.

e) State the factors to be kept in mind while selecting site for

hydro power station and explain each one in brief.

f) With neat diagram, explain the working of pelton wheel.

4. Attempt any FOUR of the following: 16

a) State the different electrical equipments used in hydro power

station and their functions.

b) Classify Hydro-electric plants according to quantity of water

available and explain each type.

c) Write down the function of:

(i) Reservoir

(ii) Surge tank

(iii) Spillways

(iv) Penstock of a HPS

d) Explain the main four steps of operation of diesel engine in

four stroke cycle.

e) Draw the block diagram of a diesel power plant and show

all its important parts.

f) Explain the construction and working of photovoltaic system.

8/12/2019 12057 Electrical

5/7

12057 [ 5 ]

Marks

5. Attempt any FOUR of the following: 16

a) What are the two different methods of conversion of biomassinto biogas? Explain each one in brief.

b) A generating station has a connected load of 43MW and a

maximum demand of 20MW; the units generated being

61.5106 per annum. Calculate:

(i) the demand factor and

(ii) load factor

c) Explain the working of geothermal energy power plant in

detail.

d) Draw and explain the working of open cycle ocean thermal

electric conversion power plant.

e) Explain in detail any three drawbacks in selecting a single

unit of maximum capacity to supply the load demand.

f) A power station has the following daily load cycle. Plot the

load curve and load duration curve. Also calculate the energy

generated per day.

Time6-8 8-12 12-16 16-20 20-24 24-6

(hrs)

Load20 40 60 20 50 20

(MW)

P.T.O.

8/12/2019 12057 Electrical

6/7

12057 [ 6 ]

Marks

6. Attempt any FOUR of the following: 16

a) Define the following terms:

(i) Maximum demand

(ii) Load factor

(iii) Average demand

(iv) Plant use factor

b) Draw and explain integrated duration curve used in system

operation.

c) Explain the construction and working of fuel cell with diagram.

d) State and explain any four merits of interconnected power

system.

e) Explain base load and peak load concepts by drawing load

curves when hydro and thermal power stations are interconnected

to meet the demand.

f) Discuss load sharing and transfer of load between two powerstations G1 and G2 in detail.

8/12/2019 12057 Electrical

7/7

12057

111223 Hours / 100 Marks