STUPIDSID
Solve any one question from Q1 and Q2
1 (a)
What are phase controlled converter? Explain with circuit diagram working of 1ϕ Half controlled converter with suitable load. Draw suitable
waveforms & comment on p.f.
7 M
1 (b)
What is inverter? Explain with diagram 3ϕ voltage controlled inverter with star load (R). Comment on waveforms & Duty cycle.
7 M
1 (c)
What is IGBT? Explain with characteristics.
6 M
2 (a)
What is the need of dual converters in the industries? Explain with diagram & waveforms, working of 1ϕ dual converter with highly inductive load.
7 M
2 (b)
Explain with circuit diagram & waveforms working of 1ϕ Full controlled
converter with RL load? Justify what is Inversion & Rectification mode
with waveforms.
7 M
2 (c)
What is bridge Inverter? Explain with circuit diagram & waveforms.
6 M
Solve any one question from Q3 and Q4
3 (a)
What are DC-to-DC converters? Explain with circuit diagram & waveforms working of 4 Quadrant chopper? State its applications.
9 M
3 (b)
What is AC to AC controller? Explain with circuit diagram working of 1ϕ AC full wave AC to AC controller with balanced star Load (R).
9 M
4 (a)
i) What is chopper? Explain in brief.
ii) A DC chopper has a resistance of 10W & input voltage is 220V. When the chopper switch remains ON its voltage drops to 2V. & chopping frequency is 1KHz. If the Duty cycle is 50% Determine,
1) Average o/p volt
2) RMS o/p voltage
3) Chopper freq
4) Input resistance of chopper
ii) A DC chopper has a resistance of 10W & input voltage is 220V. When the chopper switch remains ON its voltage drops to 2V. & chopping frequency is 1KHz. If the Duty cycle is 50% Determine,
1) Average o/p volt
2) RMS o/p voltage
3) Chopper freq
4) Input resistance of chopper
10 M
4 (b)
Explain with circuit diagram & waveforms working of TRIAC based AC power controller ckt. Comment on p.f. Justify why SCR based controllers are preferred over TRIAC based controllers.
8 M
Solve any one question from Q5 and Q6
5 (a)
Explain with block schematic working of off-line UPS. State its
specifications & applications.
8 M
5 (b)
What are speed control techniques of DC Motors? Explain with circuit
diagram working of 1ϕ separately Excited DC Motor with Inductive
Load. Comment on p.f.
8 M
6 (a)
Compare ON-Line UPS with Off-Line UPS. Justify why ON-Line is
better than Off-Line with technical reasons.
8 M
Write short notes on:
6 (b) (i)
Battery charger
4 M
6 (b) (ii)
Electronic Ballast
4 M
Solve any one question from Q7 and Q8
7 (a)
What are resonant converters? Explain with circuit diagram & waveform working of ZVS?
8 M
7 (b)
A Snubber circuit is used in SCR circuit for protection of di/dt, dv/dt. The value of RLC being 4Ω, 6μH, & 6μF respectively & Supply being
400V. Find the maximum permissible value of dv/dt. Assume the load
resistance to be 10Ω.
8 M
8 (a)
Compare Linear, switched mode & Resonant converter based power
Supplies.
6 M
Write short notes on:
8 (b) (i)
HVDC
3 M
8 (b) (ii)
Induction Heating
3 M
8 (b) (iii)
Protection circuits
3 M
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