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POWER ELECTRONICS
UNIT –I
PART-A
1. Define Thyristor And Specify The Various Type Of Thyristor
2. Explain The Need For Drive And Buffer Circuits for thyristor
3. Define forward break over voltage and reverse blocking region
4. State the important of thyristor rating
5. Draw the symbols of SCS,SUS and SBS
6. State the requirement of gate triggering
7. Define DV/DT And DI/DT
8. Explain natural commutation
PART-B
1.Explain the principle operation of SCR
2. Explain the principle operation of IGBT
3. Explain the principle operation of MOSFET
4. a) Explain the principle operation of GTO
b) Explain RC full wave trigger circuit
5.a) Explain the operation of LASER
b) Explain drive and buffer circuit for thyristor
6.Explain class C and D commutation with diagram
7.Ramp triggering
UNIT II
PART – A
1.Define phase controlled rectifier and specify its applications
2.define rectifying mode and inversion mode
3.How is phase controlled rectifier classified
4.Explain AC to AC convertor With DC links
5. Explain snubber circuit
6.Explain di/dt protection
PART-B
1.Explain single phase dual converter with R load
2.Explain three phase fully controller bridge converter with RL load
3.Explain single phase fully controller bridge converter with R load
4.Explain three phase half controller bridge converter with RL load
5. Explain the circuit diagram of half wave controlled rectifier with R load
6.Fully wave controlled rectifier with R load
UNIT III
PART-A
1.state the disadvantages of frequency modulation control over pulse with
control
2.Define line commutated inverter and force commutated inverter
3. Define step up chopper And step down chopper
4.compare online UPS and offline UPS
5.State the applications of an inverter
PART-B
1. Explain step up chopper And step down chopper
2. Explain circuit & wave form of class A &class B chopper
3. Explain diagram of online UPS and offline UPS
4. Jones chopper, morgan chopper
5. MC murray bed ford full bridge inverter
6. SMPS
7. Explain operation of parallel inverter
8. Explain120* &180* conduction
UNIT IV
PART -A
1. Write the basic equations used for speed control & torque control of DC
2. Explain PLL control of dc drive
3. Define DC drive & state its applications
4 .Draw the circuit diagram of three phase semi converter drive
5.How is microprocessor used for control the speed of DC motor
PART -B
1. Operation of chopper fed DC series motor
2. Block diagram of closed loop control of DC drives
3. Explain operation of single phase dual converter drives
4. Operation of micro processor based closed loop control of DC drive
5. a) Explain separately Excited DC motor
b)Explain single phase full converter
6. explain three phase semi converter
UNIT- V
PART-A
1. Draw torque speed characteristics
2. Explain switch mode compensator
3. What is closed loop control of AC drive
4. Specify the various types of speed control of IM
PART-B
1. Thyristor controlled inductor ,thyristor switched capacitor
2. Single phase bridge cyclo converter
3. Stator voltage control using AC voltage controller
4. Microcomputer Based PWM control of IM Drive
5. Explain static var compensator
6. explain slip power recovery scheme
Power Electronics Questions
*UNIT-1*
1. Construction and working of SCR, IGBT, MOSFET.
2. Synchronized UJT Triggering circuits.
3. IC - TCA 785 Advanced Triggering Circuits for SCR & TRIAC.
4. Commutation- class A, B, C, D, E, F.
5. Ratings of SCR.
*UNIT-2*
1. Single phase half controlled converter with R and RL Load.
2. Single phase full controlled bridge converter with R and RL Load.
3. Single phase dual converter with circulating and non circulating current.
4. Three phase fully controlled bridge converter with RL Load.
5. Complete protection circuit( over current, over voltage, snubber circuit)
*UNIT-3*
*CHOPPER*
1. Step up chopper
2. Step down chopper
3. Class A, B, C, D, E chopper
4. Jones and Morgan chopper.
5. SMPS block diagram explanation.
*INVERTER*
1. Single Full bridge inverter.
2. Three phase full bridge inverter 180° and 120° conduction mode.
3. Modified Mcmurray full bridge inverter.
4. On line and off line UPS.
5. Single phase half bridge inverter.
*UNIT-4*
1. chopper circuit for DC series motor Drive
2. Single phase full control drive.
3. Four quadrant DC - DC converter drive using MOSFET/IGBT
4. Closed loop control of DC drive
5. Phase locked loop control of DC drive.
6. Microprocessor based closed loop control of DC drive.
*UNIT-5*
1. Stator voltage controller using AC voltage controller.
2. Slip power recovery scheme using static scherbius drive.
3. Single phase to single phase cyclo converter.
4. Closed loop control of AC drive.
5. Microprocessor based closed loop control of AC drive.
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