# Download JNTUA B.Tech 4-2 R13 2018 July Supple 13A03804 Power Plant Engineering Question Paper

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Code: 13A03804

B.Tech IV Year II Semester (R13) Advanced Supplementary Examinations July 2018
POWER PLANT ENGINEERING
(Mechanical Engineering)

Time: 3 hours Max. Marks: 70

PART ? A
(Compulsory Question)

*****
1 Answer the following: (10 X 02 = 20 Marks)
(a) Mention the various types of loads.
(b) What is meant by depreciation of a power station?
(c) State the functions of super heater in boilers.
(d) Mention the use of fuel beds.
(e) State the factors that should be considered while selecting a site for a diesel power plant.
(f) List the advantages of combined cycle power plant.
(g) Mention the different types of flow measurement methods.
(h) State the advantages of hydro power plant.
(i) Define chain reaction.
(j) List the effects of photo voltaic cell.

PART ? B
(Answer all five units, 5 X 10 = 50 Marks)

UNIT ? I

2 It is proposed to supply a load with a maximum demand of 100 MW and a load factor of 0.4. Choice is to
be made from nuclear, hydro and steam power plants. Calculate the overall cost per kWh in each
scheme.
Cost Nuclear power plant Hydro power plant Steam power plant
capital/kW installed Rs. 600 Rs. 4320 Rs. 2160
Interest 10% 10% 12%
Depreciation 10% 8% 12%
Operating cost/kWh 12 paise 6 paise 18 paise
Transmission and distribution cost per kWh 0.24 paise 0.96 paise 0.24 paise

OR
3 In a power distribution system a certain feeder supplies three distribution transformers each one
supplying a group of transformers whose connected loads are as follows.
Transformer 1 Transformer 2 Transformer 3
Store lighting and power Residence lighting General power service & commercial lighting
(i) 10 kW, 5 H.P (i) 0.5 kW (i) 10 H.P, 5 kW
(ii) 4 kW (ii) 20 kW (ii) 15 H.P
Assuming motor efficiency 70% and suitable demand factor = 2.2 and diversity factor = 2.3. Calculate the

UNIT ? II

4 Explain the ash handling system in the power plant.
OR
5 In a steam power plant, operating on the ideal Rankine cycle, the steam enters the turbine at 5 MPa and
450?C and is condensed in the condenser at 15 kPa. Determine: (i) The thermal efficiency of the power
plant. (ii) The thermal efficiency if the boiler pressure is raised to 10 MPa while the turbine inlet
temperature is kept constant at 450?C.
Contd. in page 2

Page 1 of 2
R13
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Code: 13A03804

B.Tech IV Year II Semester (R13) Advanced Supplementary Examinations July 2018
POWER PLANT ENGINEERING
(Mechanical Engineering)

Time: 3 hours Max. Marks: 70

PART ? A
(Compulsory Question)

*****
1 Answer the following: (10 X 02 = 20 Marks)
(a) Mention the various types of loads.
(b) What is meant by depreciation of a power station?
(c) State the functions of super heater in boilers.
(d) Mention the use of fuel beds.
(e) State the factors that should be considered while selecting a site for a diesel power plant.
(f) List the advantages of combined cycle power plant.
(g) Mention the different types of flow measurement methods.
(h) State the advantages of hydro power plant.
(i) Define chain reaction.
(j) List the effects of photo voltaic cell.

PART ? B
(Answer all five units, 5 X 10 = 50 Marks)

UNIT ? I

2 It is proposed to supply a load with a maximum demand of 100 MW and a load factor of 0.4. Choice is to
be made from nuclear, hydro and steam power plants. Calculate the overall cost per kWh in each
scheme.
Cost Nuclear power plant Hydro power plant Steam power plant
capital/kW installed Rs. 600 Rs. 4320 Rs. 2160
Interest 10% 10% 12%
Depreciation 10% 8% 12%
Operating cost/kWh 12 paise 6 paise 18 paise
Transmission and distribution cost per kWh 0.24 paise 0.96 paise 0.24 paise

OR
3 In a power distribution system a certain feeder supplies three distribution transformers each one
supplying a group of transformers whose connected loads are as follows.
Transformer 1 Transformer 2 Transformer 3
Store lighting and power Residence lighting General power service & commercial lighting
(i) 10 kW, 5 H.P (i) 0.5 kW (i) 10 H.P, 5 kW
(ii) 4 kW (ii) 20 kW (ii) 15 H.P
Assuming motor efficiency 70% and suitable demand factor = 2.2 and diversity factor = 2.3. Calculate the

UNIT ? II

4 Explain the ash handling system in the power plant.
OR
5 In a steam power plant, operating on the ideal Rankine cycle, the steam enters the turbine at 5 MPa and
450?C and is condensed in the condenser at 15 kPa. Determine: (i) The thermal efficiency of the power
plant. (ii) The thermal efficiency if the boiler pressure is raised to 10 MPa while the turbine inlet
temperature is kept constant at 450?C.
Contd. in page 2

Page 1 of 2
R13

Code: 13A03804

UNIT ? III

6 With a neat sketch, explain diesel power plant and state its advantages.
OR
7

The gas turbine has an overall pressure ratio of 5:1 and a maximum cycle temperature of 550?C. The
turbine drives the compressor and an electric generator, the mechanical efficiency of the drive being
97%. The ambient temperature is 20?C and the isentropic efficiencies of the compressor and the turbine
are 0.8 and 0.83 respectively. Calculate the power output in kilowatts for an air flow of 15 kg/s. Calculate
also the thermal efficiency and the work ratio. Neglect the changes in kinetic energy and the loss of
pressure in combustion chamber.

UNIT ? IV

8 Explain pumped storage plant with a neat sketch and list its advantages.
OR
9 Explain about different types of spill ways with neat sketch.

UNIT ? V

10 Explain about horizontal and vertical types of wind mills with sketch.
OR
11 Explain the Pressurized Water Reactor with neat sketch.

*****

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R13
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