Download PTU. I.K. Gujral Punjab Technical University (IKGPTU) M.Tech. EE 1st Semester 36001 ADVANCED POWER ELECTRONICS Question Paper.

1 | M-36001 (S9)-499

Roll No. Total No. of Pages : 02
Total No. of Questions : 08
M.Tech.(EE)/(Pow System) (Sem.?1)
Subject Code : ELE-503/PEE-503
M.Code : 36001
Time : 3 Hrs. Max. Marks : 100

INSTRUCTION TO CANDIDATES :
1. Attempt any FIVE questions out of EIGHT questions.
2. Each question carries TWENTY marks.

Q1. a) Explain reverse recovery characteristics of diode. Hence, draw their characteristics
curves.
b) Why simultaneous firing of thyristor is required? Explain.
Q2. a) What are applications of series parallel connections of diodes? Illustrate with examples,
b) Compare the characteristics of thyristor, UJT, PUJT and DIAC.
Q3. a) Compare the applications of BJT, MOSFET, SIT IGBT based on their operating
characteristics.
b) A thyristor has a junction capacitance of 50 PF.The charging current is limited to 20 mA.
What is the value of dv/dt ? If this is to be limited to 250 V/ ?s .Determine the value of
capacitance to be connected across the thyristor ?
Q4. a) Write the principle of phase control converters. Draw and explain behaviour of three
phase full wave cycloconverter.
b) What are reasons for poor power factor in converter? Explain method for overcoming it.
Q5. a) Classify choppers. Design a chopper circuit for DC Shunt motor speed control.
b) Draw and explain the operation of a three phase dual converter. Draw its wave forms
also.

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1 | M-36001 (S9)-499

Roll No. Total No. of Pages : 02
Total No. of Questions : 08
M.Tech.(EE)/(Pow System) (Sem.?1)
Subject Code : ELE-503/PEE-503
M.Code : 36001
Time : 3 Hrs. Max. Marks : 100

INSTRUCTION TO CANDIDATES :
1. Attempt any FIVE questions out of EIGHT questions.
2. Each question carries TWENTY marks.

Q1. a) Explain reverse recovery characteristics of diode. Hence, draw their characteristics
curves.
b) Why simultaneous firing of thyristor is required? Explain.
Q2. a) What are applications of series parallel connections of diodes? Illustrate with examples,
b) Compare the characteristics of thyristor, UJT, PUJT and DIAC.
Q3. a) Compare the applications of BJT, MOSFET, SIT IGBT based on their operating
characteristics.
b) A thyristor has a junction capacitance of 50 PF.The charging current is limited to 20 mA.
What is the value of dv/dt ? If this is to be limited to 250 V/ ?s .Determine the value of
capacitance to be connected across the thyristor ?
Q4. a) Write the principle of phase control converters. Draw and explain behaviour of three
phase full wave cycloconverter.
b) What are reasons for poor power factor in converter? Explain method for overcoming it.
Q5. a) Classify choppers. Design a chopper circuit for DC Shunt motor speed control.
b) Draw and explain the operation of a three phase dual converter. Draw its wave forms
also.

2 | M-36001 (S9)-499

Q6. a) What are performance parameter of PWM inverters? Explain in brief.
b) A three phase fully controlled bridge converter is feeding a load drawing a constant and
ripple free load current of 10A at a firing angle of 30?. Determine the approximate Total
Harmonic Distortion (%THD) and the terms value of fundamental component of the
input current.
Q7. a) What are Boost and Buck converter? Where are they preferred?
b) Write the principle of PWM Control technique of voltage.
Q8. Write Short notes on :
a) AC Voltage regulator
b) Harmonic reduction
c) Bridge inverter
d) Chopper

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