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MECHANICAL ENGINEERING Subject code & title: 080120036 & POWER PLANT ENGINEER

UNIT-1

INTRODUCTION TO POWER PLANTS AND BOILERS

CAT-1

PART - AAnswer any three questions given below (3*2=6)

1. What are the types of power plants?

2. What are the thermal power plant (steam) circuits?

3. Name any two thermal power stations in tamilnadu.

4. What is rankine cycle efficiency?

5. Draw a neat sketch of basic principle of FBC BOLIERs?

PART B

Answer any two questions given below (2*12 =24)

6. a.Draw a general layout of thermal power plant and explain the working of different circuits.b. What are the advantages of supercritical over boilers?

7. (i) Draw the layout of MHD Open cycle generator and explain its functions of components.

(ii) Explain the various types of fluidized bed boilers.

8. Steam at 10 bar and 0.95 dry is available. Find the final dryness fraction of steam for each

of the following operations. Using steam table.

(i) 160 KJ of heat is removed per kg of steam at constant pressure.

(ii) it is cooled at constant volume till its temperature falls to 140 c

(iii) Steam expands isentropically in the steam turbine developing 200 K J/kg of steam flow

and pressure becomes 0.5 bars.

CAT 2

PART A

Answer any three questions given below (3*2=6)

1. Name any two heat saving devices used in a thermal power plant.

2. How do you improve the overall efficiency of a thermal power plant?

3. What is the purpose of surge tank in hydro electric power plant?

4. What are the main units in a gas turbine power plant?5. Define high pressure boilers.

PART B

Answer any two questions given below (2*12 =24)

6. a. What are the modern trends in power plant cycle improvement?

b. What are the advantages of high pressure boilers?

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7. a. Draw a neat sketch of Lamont boiler and discuss its relative merits and demerits.

b. What do you understand in analysis of power plant cycles?

8. What do you understand by fluidized bed combustion?

CAT 3

UNIT-II

STEAM POWER PLANTS

PART A


1. What are the methods used for handling of coal?

2. What are the types of mills used for pulverizing the coal?

3. What are the different pollutions in the flue gas?

4. What are the equipments used to control the particulates?

5. What are the steps in implant handling of coal?

PART- B

Answer any three questions given below (2 *12 =24)

6. a. What are the different types of pulverizing mills? explain with its neat sketch

b. Explain the different types of coal handling used?

7. a. What are the different types of dust collectors used?

b. Explain the various draught systems with a neat sketch?

8. Explain the principle involved in design of chimney.

CAT 4

PART A


1. What are types of stokers used in solid fuel firing system in coal burning?

2. What are all the types of pulverized fuel firing system in coal

3. What is cyclone separator?4. What are the methods used for controlling the NOX?

5. What is pulverization?

PART B

Answer any three questions given below (2*12 =24)

6. a. What are the methods used for pulverized fuel burning?

b. What are the different types of cooling towers? Explain with a neat sketch.

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7. a. Differentiate between forced draughts and induce draught system in cooling tower.

b. How ash is handled in the power plant? Explain the ash handling system?

8. What are the various methods of preparation of coal?

CAT 5

UNIT- III

NUCLEAR AND HYDEL POWER PLANTS

PART A


1. Explain radio activity principles.

2. Differentiate nuclear fission and nuclear fusion

3. Define the term breeding

4. Differentiate the impulse and reaction turbine.

5. What is a tangential flow turbine?

PART B


6. a. Explain the main components of nuclear power plants?

b. Explain the construction and working of pressurized water reactor.

7. Describe the classification of turbines.

8. a. Differentiate pelton wheel turbine with Francis turbine

b. What are the components of pelton wheel? And explain briefly.

CAT 6

PART A


1. What are axial flow turbines? give an example2. What is a draft tube and explain its function?

3. Define specific speed of the turbine

4. What is the function of draft tube in turbine outlet?

5. Define unit discharge.

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PART B


6. a. Define specific speed of a turbine. derive an expression for the specific speed

b. Draw a layout of a typical micro scheme and explain its working in detail.

7. a. Explain the term unit power , unit speed and unit discharge with reference to a

turbine

b. Write the characteristic curves of hydraulic turbines and explain briefly

8. Give the range of specific speed values of Kaplan, Francis turbine and pelton wheels.

CAT 7

UNIT- IVDIESEL AND GAS TURBINE POWER PLANT

PART A


1. What are the essential components of diesel power plants?

2. What are the applications of diesel power plant?

3. What are the commonly fuel injection system in a diesel power station?

4. What are the effects of providing the intercooler in the gas turbine cycle?

5. What Is the principle of operation of simple jet propulsion system?

PART B

Answer any three questions given below ( 2*12 =24)

6. a. Why the brayton cycle is most suitable for gas turbine power plant?

b. What are the advantages and disadvantages of diesel power plants?

7. Name and explain briefly the various types of fuel injection system.

8. a. State the applications of diesel power plant.

b. Describe briefly the commonly used starting system in large and medium size engines?

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CAT 8

PART A


1. Mention the various process of brayton cycle.2. What the effects are of re-heat cycle?

3. When will the intercooler is providing between the compressors.

4. What are the effects of introducing regeneration in the basic gas turbine cycle?

5. Sketch the schematic arrangement of open cycle gas turbine plant and name the

components.

PART B


6. Derive an expression for air standard efficiency of brayton cycle in terms of (i)compression ratio (ii) pressure ratio.

7. Consider a stationary power plant operating on an ideal brayton cycle .the pressure ratio

of the cycle is 8 and the gas temperature at the compressor inlet and turbine inlet are

27C and 1027 C respectively. determine ,

(i) Gas turbine at the compressor and turbine exit.

(ii) Back work ratio

(iii) Thermal efficiency

(iv) Assume pr 1 is 1.386 and pr3 is 330.9, where pr is the relative pressure.

8. a. Briefly explain the combined cycle gas turbine power plants.

b. Explain with a neat sketch of working principle of open cycle gas turbine and closed

cycle gas turbine.

CAT 9

UINT- V

OTHER POWER PLANTS AND ECONOMICS OF POWER PLANTS

PART A

Answer any three questions given below (3*2=6)1. What is geo thermal energy?

2. What are the different geo thermal fluids?

3. What are the different types of geothermal energy deposits?

4. What are the principles of OTEC?

5. What are the different types of energy storage systems?

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PART B


6. a. Explain pumped storage system with neat sketch.

b. What are the important factors to be considered for selection of site for power plants?

7. Define the following terms

a. (i) maximum demand (ii) plant use factor (iii) plant utilization factor (iv) load factor

b. What are the important factors to be considered for selection of site for power

plants?

8. a. power plant is having use factor and capacity factor of 0.53 and 0.48 respectively on

the basic of annual operator, find the number of hours of its operation during the year.

b. What are the different types of ocean thermal energy conversion systems?

CAT 10

PART A


1. What are the advantages of tidal power generation?

2. What are the different types of energy storage systems?

3. What are the various operating costs of coal fired steam power plant?

4. What is demand?

5. Define load curve.

PART- B


6. a. Write short notes on load duration curve.

b. What are the various types of loads?

7. a. Write cost analysis involved in power plant.

b. What is meant by load factor and diversity factor?

8 Write short notes on how the power generation cost can be reduced?

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