Vtu advance power w
Electronics question paper/2012

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Vtu advanced power electronics question paper/2015

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Vtu advanced power electronics question paper 2012

please visit Advanced power Electronics Question Papers

SECTION - I

QI) a) What is the need of PWM technique in converter circuits? Explain with circuit diagram 8 waveforms, working 3 ^ IGBT based PWM rectifier with suitable load. Comment on Pf 8 hormonics. [10]

b) Explain, EMI 8 power quality problem of Thyrister converter. [6]

OR

Q2) a) What is power conditioning of diode rectifier? Explain. [6]

b) What is the need of 12 pulse converter in heavy industries? Justify how it improves the system performance as compare to conventional converters. [10]

Q3) a) What is Phase Locked Loop Control System? Explain with diagram speed control of DC Motor using PLL for varying load conditions. State its advantages 8 dis-advantages. [10]

b) Explain the need of (c based DC drive in industries. [6]

OR

Q4) a) What are AC drives? Explain with block diagram 3 ^ , reversible Flux Control for IM drive. State its advantages and disadvantages. [8]



b) Justify why cycloconverter based IM are not recommended for high power industrial applications. [8]

Q5) a) What are different types of modulation techniques used in inverters?

Explain any one type. State its advantages. [6]

b) What is the need of DC-Link inverter? State its advantages and disadvantages. [6]

c) What is adaptive control? Explain. [6]

OR

Q6) a) What are Multi-Level Inverters? Explain with circuit diagram switching of Multi-level inverters. State its advantages 8 dis-advantages. [10]

b) Write short notes on any two : [8]

i) Z – source inverters.

ii) Space vector modulation.

iii) Double sided converter system.

iv) UPS.

SECTION – II

Q7) a) What is soft switching in Resonant converter? Explain with circuit diagram 8 waveforms, working SLR converter. [10]

b) What is hot swappable redundant Power Supply? Explain. [6]

OR

Q8) a) Explain the difference between single 8 Multi-resonant converter. [8]

b) What is ZCS? Explain with circuit dia 8 waveforms working of ZCS. State its advantage 8 dis-advantages over ZVS. [8]

Q9) a) What are different types of Renewable energy sources? Explain the role of DC – to DC converter in variable wind energy y-conversion system.

[10]

b) What is the role of Power Electronic Converters (PEC’s) in Wind Power Plants (WPP’s). [8]

OR

QIO) a) What are battery powered drives? Explain. [6]

b) Explain in brief, Photovoltalic energy conversion system. [6]

c) What is the role of Back to Back Power Electronic Converters (PEC’s)