Exam Details
| Subject | power electronic converters-i | |
| Paper | ||
| Exam / Course | computer science and engineering | |
| Department | ||
| Organization | Vardhaman College Of Engineering | |
| Position | ||
| Exam Date | December, 2017 | |
| City, State | telangana, hyderabad |
Question Paper
Hall Ticket No:
Question Paper Code B3302
(AUTONOMOUS) M. Tech I Semester Regular/Supplementary Examinations, December 2017
(Regulations: VCE-R15) POWER ELECTRONIC CONVERTERS-I
(Power Electronics and Electric Drives) Date: 29 December, 2017 FN
Time: 3 hours
Max Marks: 70
Answer any FIVE Questions
Each Question carries equal marks
1.
Briefly explain the operation of AC voltage controller with PWM control.
7M
A single phase A.C voltage controller with R-L load has the following details Suppy voltage 230V, 50Hz; R=4Ω and ωL=3Ω, calculate:
i. The control range of firing angle
ii. The maximum value of RMS load current
iii. The maximum power and power factor
iv. The maximum values of average and RMS thyristor current
7M
2.
With a neat circuit and waveforms briefly explain the operation of three phase AC voltage controller with star connected RL load.
7M
A three phase controller supplies a star connected R load of R=5Ω and line to line input voltage is 210V 50Hz. The firing angle is Determine:
i. The RMS output phase voltage
ii. The input power factor
7M
3.
Explain the operation of three phase to three phase midpoint configuration of cycloconverter with near waveforms.
7M
With neat circuit and waveforms explain the operation of Matrix converter.
7M
4.
Explain the operation of single phase fully controlled converter with RL load and derive the necessary expressions for output voltage. Also explain the performance measures of the converter.
7M
Explain the process of symmetrical angle control and PWM control methods.
7M
5.
Explain the operation of half controlled three phase converter and derive the expression for average output voltage.
7M
Briefly explain the operation of twelve pulse converter.
7M
6.
Briefly explain the analysis of Buck Boost converter.
7M
The buck regulator has input voltage of V=12V. The required average output voltage is Va=5V at R=500Ω and peak to peak output ripple voltage is 20mv. If the peak to peak ripple current of inductor is limited to 0.8A determine:
i. Duty Cycle
ii. Filter inductance L C
7M
7.
With neat circuit diagram and wave forms explain the operation of single phase full bridge inverter with RL load. Derive the expression for RMS value of fundamental component of output voltage.
7M
Explain single pulse width modulation technique for full bridge inverter. To eliminate the third order harmonics what should be the width of the pulse. With that width of the pulse find the RMS output voltage. Also derive the generalized expression for RMS output voltage.
7M
Cont…2
8.
With neat circuit diagram and waveforms explain the operation of 180 mode of operation of three phase inverter with RL load. Derive the expression for RMS output voltage.
7M
Explain space vector pulse width modulation technique for three phase voltage source inverter.
7M
Question Paper Code B3302
(AUTONOMOUS) M. Tech I Semester Regular/Supplementary Examinations, December 2017
(Regulations: VCE-R15) POWER ELECTRONIC CONVERTERS-I
(Power Electronics and Electric Drives) Date: 29 December, 2017 FN
Time: 3 hours
Max Marks: 70
Answer any FIVE Questions
Each Question carries equal marks
1.
Briefly explain the operation of AC voltage controller with PWM control.
7M
A single phase A.C voltage controller with R-L load has the following details Suppy voltage 230V, 50Hz; R=4Ω and ωL=3Ω, calculate:
i. The control range of firing angle
ii. The maximum value of RMS load current
iii. The maximum power and power factor
iv. The maximum values of average and RMS thyristor current
7M
2.
With a neat circuit and waveforms briefly explain the operation of three phase AC voltage controller with star connected RL load.
7M
A three phase controller supplies a star connected R load of R=5Ω and line to line input voltage is 210V 50Hz. The firing angle is Determine:
i. The RMS output phase voltage
ii. The input power factor
7M
3.
Explain the operation of three phase to three phase midpoint configuration of cycloconverter with near waveforms.
7M
With neat circuit and waveforms explain the operation of Matrix converter.
7M
4.
Explain the operation of single phase fully controlled converter with RL load and derive the necessary expressions for output voltage. Also explain the performance measures of the converter.
7M
Explain the process of symmetrical angle control and PWM control methods.
7M
5.
Explain the operation of half controlled three phase converter and derive the expression for average output voltage.
7M
Briefly explain the operation of twelve pulse converter.
7M
6.
Briefly explain the analysis of Buck Boost converter.
7M
The buck regulator has input voltage of V=12V. The required average output voltage is Va=5V at R=500Ω and peak to peak output ripple voltage is 20mv. If the peak to peak ripple current of inductor is limited to 0.8A determine:
i. Duty Cycle
ii. Filter inductance L C
7M
7.
With neat circuit diagram and wave forms explain the operation of single phase full bridge inverter with RL load. Derive the expression for RMS value of fundamental component of output voltage.
7M
Explain single pulse width modulation technique for full bridge inverter. To eliminate the third order harmonics what should be the width of the pulse. With that width of the pulse find the RMS output voltage. Also derive the generalized expression for RMS output voltage.
7M
Cont…2
8.
With neat circuit diagram and waveforms explain the operation of 180 mode of operation of three phase inverter with RL load. Derive the expression for RMS output voltage.
7M
Explain space vector pulse width modulation technique for three phase voltage source inverter.
7M
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