August
T05/TES101/EE/20150819
2015
Power Electronics - 1
Instructions:
MARKS-80
Time: 3 Hrs
1. All questions are compulsory.
2. “Long Answer type Question (LAQ)” is a supply type
question of 15 marks which required a typical answer of about
60-80 lines in bout 32-40 minutes.
3. “Sort Answer type Question (SAQ)” is a supply type question
of 5 marks which required a typical answer of about 15-20 lines
in bout 08-10 minutes.
4. Figures to the right indicate marks allotted to the questions.
5. Assume suitable data if necessary
6. Use a nonprogrammable type of scientific calculator is
allowed
Marks
SECTION-A
Q.1 Draw & Explain the self commutation by Resonating the load with
waveform. (class A)
OR
15
Q.1 Explain in brief voltage and current rating of SCR
15
Q.2 Explain R-firing circuit. What is drawback of R-firing circuit? How
to overcome it?
15
OR
Q.2 Define string efficiency? Derive expression for it?
15
Q.3 Draw the circuit diagram for natural commutation circuit with
waveform.
5
Q.4 Why gate triggering is preferred over other turn-ON methods of the
SCR?
5
SECTION—B
Q.5 Difference between single phases controlled half wave& full wave
rectifier.
15
OR
Q.5 Explain the working of single-phase half-controlled bridge rectifier
with resistive load with neat circuit diagram& waveform
15
Q.6 Draw the circuit diagram for firing circuits for line commutated
converter. Explain its operation.
15
OR
Q.6 A) Differentiate SMPS and UPS.
B) State the specifications of ON line UPS.
07
08
Q.7 Necessity of controlled Rectifiers?
5
Q.8 Analysis of HWCR with resistive load with the help of waveform.
5
Computer Generated Random Question Paper dated: 17-07-2015 11:55:47
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