# Download PTU M.Tech. EE 1st Semester 75221 PWM CONVERTER AND APPLICATIONS Question Paper

Download PTU. I.K. Gujral Punjab Technical University (IKGPTU) M.Tech. EE 1st Semester 75221 PWM CONVERTER AND APPLICATIONS Question Paper.

1 | M-75221 (S35)-2215

Roll No. Total No. of Pages : 01
Total No. of Questions : 08
M.Tech. (EE) El-II (2018 Batch) (Sem.?1)
PWM CONVERTER AND APPLICATIONS
Subject Code : MTEE-104A-18
M.Code : 75221
Time : 3 Hrs. Max. Marks : 60

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

1. What are major differences between voltage and current source converters? Explain the
working of a current source converter using circuit diagram and corresponding
waveforms.
2. Classify different types of DC/AC converters. Draw neat circuit diagram of each type of
these converters.
3. Discuss in detail space vector based PWM technique for bridge converters.
4. How a practical power electronic device behaves differently from that of ideal one?
Explain how conduction losses are calculated in practical power electronic circuits?
5. A 3-phase, Y-connected, 60 Hz, 4-pole induction motor has the following parameters:
R
1
= R
2
= 0.024 ? and X
1
= X
2
= 0.12 ? ?. The motor is controlled by the variable
frequency control with a constant (V/f) ratio. For an operating frequency of 12Hz,
calculate the maximum torque as a ratio of its value at the rated frequency for both
motoring and braking.
6. Explain how current ripples are estimated in inverted fed drives?
7. With the help of a neat circuit diagram explain how switching converters are used for
reactive power compensation.
8. Write short notes on :
a) Multilevel inverters
b) Bus clamping PWM

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