STUPIDSID
1 (a)
Explain SCR characteristics.
5 M
1 (b)
Write advantages of IGBT and MOSFET.
5 M
1 (c)
Explain need of synchronizing circuit in converters.
5 M
1 (d)
Draw the circuit of Jones Chopper and explain the commutation of main SCR.
5 M
2
Design a converter to give output voltage 150 V at 1A load current. The input is 230V 50 Hz ac supply. Use UJT 2n2646.
VBBmax=35v for Vbb=16 V, C=0.1μF, ηmin=0.56, ηmax=0.75, ηtype=0.63, Iv=4mA, Ip=25μA Consider temperature compensation.
VBBmax=35v for Vbb=16 V, C=0.1μF, ηmin=0.56, ηmax=0.75, ηtype=0.63, Iv=4mA, Ip=25μA Consider temperature compensation.
20 M
3 (a)
With the help of a neat diagram and associated waveform discuss the operation of Buck-Boost converter. Also list the advantages and disadvantages of this type of converter.
10 M
3 (b)
Explain variable frequency I.M. drive.
10 M
4 (a)
Describe the working of 1 phase fully controlled bridge converter in the following two modes.
Rectifying mode
Inversion mode
Also sketch the following waveforms for α=45°, & α=120°.
Rectifying mode
Inversion mode
Also sketch the following waveforms for α=45°, & α=120°.
10 M
4 (b)
Write a short note on reduction of harmonic distortion.
5 M
4 (c)
Briefly explain the V-I characteristics of IGBT.
5 M
5 (a)
Explain the application of power electronics in industrial heating process.
10 M
5 (b)
A 1-phase HW ac regulator feeds power to resistive load of 6Ω from 230V, 50Hz source.
The firing angle of SCR is π/2. Calculate
i) The rms value of output voltage
ii) average input current.
The firing angle of SCR is π/2. Calculate
i) The rms value of output voltage
ii) average input current.
10 M
6 (a)
Explain the current fed ac drives & state its applications.
10 M
6 (b)
State the significant features of traction drives.
5 M
6 (c)
Explain any one type of forced commutation.
5 M
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