STUPIDSID
1 (a)
List the different members of the thyristor family and draw their characteristics
and explain in brief.
7 M
1 (b)
Explain single phase half wave rectifier with suitable circuit and waveform.
7 M
2 (a)
Discuss briefly the parallel operation of MOSFETs.
7 M
2 (b)
Explain the safe operating areas of an IGBT.
7 M
2 (c)
A three-phase fully- controlled bridge converter is connected to three-phase
a.c. supply of 400 V, 50Hz and operates with a firing angle α=π/4. The load current is maintained at 10A and the load voltage is 360 V. Compute: (i) Source inductance, L s (ii) Load resistance, R (iii) Overlap angle,μ
7 M
3 (a)
Explain the various techniques of improving power factor in three phase
controlled converters.
7 M
3 (b)
Explain the DC Chopper's principal of operation .
7 M
3 (c)
A DC Chopper operates on 230 V dc and frequency of 400Hz; feed an R-L
load. Determine the ON time of the chopper for output of 150 V.
7 M
3 (d)
Briefly discuss the switching behavior of a GTO.
7 M
4 (a)
Explain single phase full bridge inverter.
7 M
4 (b)
A single-phase half bridge inverter has a resistive load of R= 3Ω and the dc input voltage Edc =24 Volts.
Determine: (i) IGBT ratings (ii) Total Harmonics distortion THD (iii) The distortion factor DF (iv) The Harmonics factor and DF of the lowest order Harmonic.
Determine: (i) IGBT ratings (ii) Total Harmonics distortion THD (iii) The distortion factor DF (iv) The Harmonics factor and DF of the lowest order Harmonic.
7 M
4 (c)
Discuss the pulse width modulated inverter.
7 M
4 (d)
Explain three phase bridge inverter.
7 M
5 (a)
Explain the operation of UPS system.
7 M
5 (b)
Explain switched mode power supplies.
7 M
5 (c)
Compare dielectric heating with induction heating.
7 M
5 (d)
Draw and explain the operation of automatic battery charger with trickle
charging arrangement.
7 M
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