RTU 2016 Question Paper Semester VI Electrical and Electronics Engineering Advanced Power Electronics

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RollNo.
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f- 686074
Total No of Pages:
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B. Tech. vr-sem- (Main/Back) Exam., April/lVl ay-20r6
Electrical & Electronics Engineering
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\o 6BX4A Advanced power Electronici
Common with EE, EX
Time: 3 Hours
Maximum Marks: 80
Min. Passing Marks (Main & Back): 26
Instructions to Candidate s : -

Attempt any five questions, selecting one question
from each unit. All
Questions carry equal marks. schematic diagrams must be shown
wherever necessary. Any data you
feer missing may suitabry be assumed
and stated clearly.
units of quantities used./ calculated must be stated clearly.
(Jse of following supporting material
is permitted during examination.
(Mentioned inform No. 205)
1. NIL
% 2. NIL

Q.1 (a) Explain the operation of single phase AC voltage controller with R load. What
changes will take place in output voltage? tgl
(b) A three phase, 3 wire bidirectional controller supplies a star connected
R load of
R = 5Q and line to line voltage of 210v (RMs; at 50 Hz.
The firing angle o =
nl2.Determine:
tSl
(i) RMS output phase voltage Eo
(ii) Input power factor p. f.
(iii) Expression for instantaneous output voltage of phase ,A,

[6E60741 Page 1 of4

B
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of three phase full wave controller'
Q.1 (a) Explain the working principle
a load of
has inpttt voltage of 230V, 50Hz and
(b) A single phase voltage controller
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-
P = 160 for cYcle off' Determine

(i) RMS outPut voltage'

(ii) InPut Power factor'

(iii) RMS thYristor current'
UNIT.II
circuit
cyclo converter with relevant
Q,2 (a) Describe
three phase to three phase
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arangement using 18 SCRs'
control circuit of three Phase
cYclo
principle of
(b) Explain the working
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converter'

G
phase cYcle converters'
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phase to single
Q.2 (a) Explain the operation of three
at Power factor of 0.7
\/
converter feeds a 1--O
load of 190V. 45A
(b) A 3-S cycle
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(lagging). Determine -

(D The required suPPlY voltage'
(ii) ThYristor rating, and
(iii) Power factor of supply current'

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16860741

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OR

Q.4 (a) Explain the M typeZCS resonant.
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(b) Explain working principle of ZVS resonant
converter in deta,.
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UNIT-V
Q.s (a) Discuss the comparative analysis of fly back and forward
converter in
detail.
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(b) Discuss the operation of bidirectional AC
power supply.
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OR
Q'5 (a) what is the conditioning of power factor? Discuss multistage
coRverter used
for conditioning of power factor .
[10]
(b) Explain the resonant AC power supplies.
t6l

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