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Slot 2 EE603

This document is a slot test for the Power Electronics course at Dr. Sudhir Chandra Sur Degree Engineering College, consisting of multiple-choice questions and problem-solving tasks related to electrical engineering concepts. Topics include cycloconverters, SCR bridge converters, buck-boost converters, and inverters. The test assesses students' understanding of power electronics principles, calculations, and applications.

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anirban.share.1987
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23 views2 pages

Slot 2 EE603

This document is a slot test for the Power Electronics course at Dr. Sudhir Chandra Sur Degree Engineering College, consisting of multiple-choice questions and problem-solving tasks related to electrical engineering concepts. Topics include cycloconverters, SCR bridge converters, buck-boost converters, and inverters. The test assesses students' understanding of power electronics principles, calculations, and applications.

Uploaded by

anirban.share.1987
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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DR.

SUDHIR CHANDRA SUR DEGREE ENGINEERING COLLEGE

Department of Electrical Engineering

Power Electronics (EE 603)

Slot Test 2, 6th Semester, 2019

Time: 1hr Full Marks: 25

1) Answer the following


1x5=5
i) A cycloconverter is a
a) AC-AC converter
b) DC-DC converter
c) DC-AC converter
d) None of the above
[CO2]
ii) A chopper has Vs as the source voltage, R as the load resistance & ɑ as the duty
cycle. The RMS value of the output voltage is
a) ɑ Vs c)√(1- ɑ) Vs
b) Vs/ ɑ d)√ɑ Vs
[CO2]
iii) Switched mode power supply is preferred over continuous type because SMPS
a) Is suitable for both AC & DC
b) Is suitable for low power circuits
c) Is suitable for high power circuits
d) Provides low power loss
[CO2]
iv) Bulk power transmission over long HVDC lines are preferred on account of
a) Low cost HVDC terminals
b) No harmonic problem
c) Minimum line power losses
d) Simple protection
[CO2]
v) The advantage of a 180 degree conduction three phase inverter over a 120 degree
conduction three phase inverter is that
i) It needs less number of switches
ii) There is no paralleling of switches
iii) Devices in series are not simultaneous switches
iv) Load terminals are not left open during switching
[CO2]
Answer any two of the following
2) A three phase fully controlled SCR bridge converter is supplied with 230V (rms) per phase.
The source inductance per phase is 0.02H. The load is highly inductive with constant load
current of 10A. Find

i. The firing angle for an output voltage of 345V.


ii. The overlap angle.
5
[CO3]

3) Derive the expressions for average output voltage of a buck-boost converter with necessary
waveforms & circuit diagrams.
[CO3]

5
4) A step down chopper has a resistive load of 10Ω & an input voltage of 120V. When the
chopper is turned on, the voltage drop across the switch is 1V. The chopping frequency is
0.5 kHz. If the duty cycle is 40%, determine the average output voltage, RMS output voltage,
efficiency of the chopper & the effective input resistance of the chopper.

5
[CO3]

Answer any one of the following


5) a) Describe the working of a three phase full-bridge inverter (VSI) with phase & line voltage
waveforms & circuit diagram for resistive star connected load. Assume the duration of
conduction of each SCR to be 120 degrees OR 180 degrees as per your choice.

b) What are the differences between VSI & CSI?

c) What are the methods to improve the power factor of a phase controlled converter?
5+2+3=10
[CO4]
6) a) What is a cycloconverter? Explain the principle of operation of a single phase step up
cyclo converter.

b) State the advantages & disadvantages of a cycloconverter. Also mention its applications.

c) Explain the blocked mode & circulating current mode of a cycloconverter.


4+3+3=10
[CO4]

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