Exam Details
| Subject | power electronic converters-ii | |
| Paper | ||
| Exam / Course | b.tech | |
| Department | ||
| Organization | Vardhaman College Of Engineering | |
| Position | ||
| Exam Date | June, 2017 | |
| City, State | telangana, hyderabad |
Question Paper
Hall Ticket No:
Question Paper Code B3306
(AUTONOMOUS) M.Tech II Semester End Semester Regular Examinations, June 2017
(Regulations: VCE-R15) POWER ELECTRONIC CONVERTERS-II
(Power Electronics and Electric Drives) Date: 05 June, 2017 FN
Time: 3 hours
Max Marks: 70
Answer any Five Questions.
All Questions carries equal marks.
1.
Write short notes on:
i. MTO
ii. ETO
iii. MCT
12M
Mention which one of the following devices is voltage controlled and which one is current controlled:
i. Power transistor
ii. MOSFET
2M
2.
What are the two different types of series inverters? Explain the operation of any one type in detail.
7M
The half-bridge resonant inverter is operated at an output frequency of 7kHz. If C1-C2-C=3uF, R=2Ω and Vs=220V, determine:
i. The peak supply current
ii. The average thyristor current
iii. The rms thyristor current
7M
3.
Discuss the operation of quasi-resonant inverters.
6M
A parallel resonant inverter delivers a load power of 1kW at a peak sinusoidal load voltage of Vp=170V and at resonance condition. The load resistance is 10Ω. The resonant frequency is 20kHz. Determine:
i. The dc input current
ii. The quality factor, if it is required to reduce the load power to 250W by frequency control so that u=1.25
iii. The inductance value
iv. The capacitance value
8M
4.
Draw the diagram of a two quadrant ZVS resonant converter and explain the different modes of operation.
10M
What are the advantages and disadvantages of ZVS converters?
4M
5.
Explain the concept of producing stepped ac voltages using multilevel inverters with a generalized topological diagram.
8M
List the features, advantages and disadvantages of cascaded inverters.
6M
6.
Explain how multilevel converters connected back-to-back can be used to connect two asynchronous systems.
8M
Compare the different configurations of different multilevel converters.
6M
7.
With the circuit diagram, briefly explain the operation of a bi-directional power supply.
7M
Write short notes on the different types of dc power supplies.
7M
8.
Explain the operation of switched mode AC power supplies.
7M
Briefly explain the operation of offline uninterruptible power supplies.
7M
Question Paper Code B3306
(AUTONOMOUS) M.Tech II Semester End Semester Regular Examinations, June 2017
(Regulations: VCE-R15) POWER ELECTRONIC CONVERTERS-II
(Power Electronics and Electric Drives) Date: 05 June, 2017 FN
Time: 3 hours
Max Marks: 70
Answer any Five Questions.
All Questions carries equal marks.
1.
Write short notes on:
i. MTO
ii. ETO
iii. MCT
12M
Mention which one of the following devices is voltage controlled and which one is current controlled:
i. Power transistor
ii. MOSFET
2M
2.
What are the two different types of series inverters? Explain the operation of any one type in detail.
7M
The half-bridge resonant inverter is operated at an output frequency of 7kHz. If C1-C2-C=3uF, R=2Ω and Vs=220V, determine:
i. The peak supply current
ii. The average thyristor current
iii. The rms thyristor current
7M
3.
Discuss the operation of quasi-resonant inverters.
6M
A parallel resonant inverter delivers a load power of 1kW at a peak sinusoidal load voltage of Vp=170V and at resonance condition. The load resistance is 10Ω. The resonant frequency is 20kHz. Determine:
i. The dc input current
ii. The quality factor, if it is required to reduce the load power to 250W by frequency control so that u=1.25
iii. The inductance value
iv. The capacitance value
8M
4.
Draw the diagram of a two quadrant ZVS resonant converter and explain the different modes of operation.
10M
What are the advantages and disadvantages of ZVS converters?
4M
5.
Explain the concept of producing stepped ac voltages using multilevel inverters with a generalized topological diagram.
8M
List the features, advantages and disadvantages of cascaded inverters.
6M
6.
Explain how multilevel converters connected back-to-back can be used to connect two asynchronous systems.
8M
Compare the different configurations of different multilevel converters.
6M
7.
With the circuit diagram, briefly explain the operation of a bi-directional power supply.
7M
Write short notes on the different types of dc power supplies.
7M
8.
Explain the operation of switched mode AC power supplies.
7M
Briefly explain the operation of offline uninterruptible power supplies.
7M
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