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EEE

II YEAR

ELECTRICAL MACHINES - I

POWER PLANT ENGINEERING

LINEAR INTEGRATED CIRCUITS AND
APPLICATIONS

CONTROL SYSTEMS

DIGITAL LOGIC CIRCUITS

NUMERICAL METHODS

III YEAR

VLSI DESIGN

MICROPROCESSOR AND
MICROCONTROLLER

MODERN CONTROL SYSTEMS

POWER SYSTEM ANALYSIS

ELECTRICAL MACHINE DESIGN

POWER ELECTRONICS

IV YEAR

MOBILE COMMUNICATION

RENEWABLE ENERGY SOURCES

ELECTRIC ENERGY GENERATION
CONSERVATION AND UTILIZATION

POWER QUALITY

POWER ELECTRONICS

UNIT-I

PART-A

1. What are the different methods to turn on the thyristor?
2. Define latching current.
3. Define holding current.
4. What is a snubber circuit?
5. Why IGBT is very popular nowadays?
6. What is the difference between power diode and signal diode?
7. What are the advantages of GTO over SCR?
8. What losses occur in a thyristor during working conditions?

PART-B

1. Draw the two transistor model of SCR and derive an expression for anode current. (8)
2. Explain the characteristics of SCR (8)
3. Describe the various methods of thyristor turn on. (16)
4. Explain the operation of MOSFET and IGBT (16)

UNIT I

PART-A

1. What is the function of freewheeling diodes in controlled rectifier?
2. What is commutation angle or overlap angle?
3. What are the advantages of six pulse converter?
4. What is meant by commutation?
5. What are the types of commutation?
6. Mention some of the applications of controlled rectifier.
7. What are the different methods of firing circuits for line commutated converter?

8. What is meant by natural commutation?
9. What is meant by forced commutation? In this commutation, the current flowing through

PART-B

1. Describe the working of 1 _ fully controlled bridge converter in the Rectifying mode and
inversion mode. And derive the expressions for average output voltage and rms output
voltage. (16)
2. Describe the working of 3 _ fully controlled bridge converter in the Rectifying mode and
inversion mode. And derive the expressions for average output voltage and rms output
voltage. (16)
3. Describe the working of Dual converter. (16)
4. Derive the expressions for average output voltage and rms output voltage of 1 _
semiconverter. (16)

UNIT III

PART-A

1. What is meant by dc chopper?
2. What are the applications of dc chopper?
3. What are the advantages of dc chopper?
4. What is meant by step-up and step-down chopper?
5. What is meant by duty-cycle?
6. What are the two types of control strategies?
7. What is meant by TRC?
8. What are the two types of TRC?
9. What is meant by PWM control in dc chopper?

PART-B

1. Describe the principle of step-up chopper. Derive an expression for the average output ]
voltage in terms of input dc voltage & duty cycle. (16)
2. Describe the working of four quadrant chopper. (16)
3. Explain the working of current commutated chopper with aid of circuit diagram and
necessary waveforms. Derive an expression for its output voltage. (16)
4. Explain the working of voltage commutated chopper with aid of circuit diagram and
necessary waveforms. Derive an expression for its output voltage. (16)

UNIT IV

PART-A

1. What is meant by inverter?
2. What are the applications of an inverter?
3. What are the main classification of inverter?
4. Why thyristors are not preferred for inverters?

5. Give two advantages of CSI.
6. What is meant a series inverter?
7. What is meant a parallel inverter?
8. What are the applications of a series inverter?
9. What is meant by McMurray inverter?
10. What are the applications of a CSI?
11. What is meant by PWM control?
12. What are the advantages of PWM control?

PART-B

1. Describe the operation of series inverter with aid of diagrams. Describe an expression for
output frequency, current and voltages. What are the disadvantages of basic series
inverter? (16)
2. State different methods of voltage control inverters. Describe about PWM control in
inverter. (16)
3. Explain the operation of 3 _ bridge inverter for 180 degree mode of operation with aid of
relevant phase and line voltage waveforms. (16)

UNIT V

PART-A

1. What does ac voltage controller mean?
2. What are the applications of ac voltage controllers?
3. What are the advantages of ac voltage controllers?
4. What are the disadvantages of ac voltage controllers?
5. What are the two methods of control in ac voltage controllers?
6. What is the difference between ON-OFF control and phase control?
7. What is meant by cyclo-converter?
8. What are the two types of cyclo-converters?
9. What is meant by step-up cyclo-converters?
10. What is meant by step-down cyclo-converters?
11. What are the applications of cyclo-converter?

PART-B

1. Explain the operation of multistage control of AC voltage controllers with neat diagram. (16)
2. Explain the operation of 1_ AC voltage controller with RL load. (16)
3. Explain the operation of 1_ sinusoidal AC voltage controller. (16)
4. For a 1 _ voltage controller, feeding a resistive load, draw the waveforms of source voltage,
gating signals, output voltage and voltage across the SCR. Describe the working with
reference to waveforms drawn. (16)

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