RTU 2016 Question Paper Semester VI Electrical Engineering High Voltage Engineering

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RollNo. Total No of Pages: tr
N 6F'6072
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B. Tech. VI-Sem. (Main/Back) Exam., ApriVMay'2016
Electrical Engineering
rq 6E,E2L High Voltage Engineering
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Time: 3 Hours Maximum Marks: 80
Min. Passing Marks (Main & Back): 26
Instructions to Candidute s :'

Anempt any five questions, selecting one questi.on from each unit. All
Questions carry equal marks. Schematic diagrams must be shown
wherever necessary. Any data you feel missing may suitably be assumed
and stated clearly.
Units of quantities used/ calculated must be stated clearly.
(tse of fotlowing supporting material is permitted during examination.
(Mentioned in form No. 205 )
I. NIL 2. NIL

UNIT.I

Q.1 (a) Classify and explain breakdown mechanism in commercial liquid dielectric. t8l

(b) What is treeing & tracking? Explain these two phenomenon in solid dielectrics.[8]

OR

e.l (a) What is electronegative gas? Discuss criteria for its breakdown. Why its
breakdown strength is higher than other gas? t8l

(b) Define Townsend's first & second ionization co-efficient. Explain Townsend
discharge. t8l

1686072) : Page 1 of3 [1o10ol

UNIT.II
Q.2 (a) what are the components of a multistage impulse generator?
Draw & explain
Marx circuit and modified Marx circuit of
murti stage impulse generator. Discuss
the difference between Marx and modified
Marx circuit
t10l
(b) what is cascaded transformer and explain its working
with a diagram. t6l
OR
Q'2 (a) Explain how a sphere gap can be used to measure the peak
value of voltages.
what are the parameters & factors that influence
such voltages measurements?[8]
(b) Explain vande - Graaf generator with schematic
diagram.
t8l

Q'3 (a) Explain the partial discharge phenomenon and draw equivalent
circuit for partial
discharge phenomenon.
t8l
(b) Give the comparison of wide band and naffow
band partial discharge detection
circuits.
t8l
OR
Q'3 Explain the high voltage Schering bridge with a neat diagram for
the measurement of
capacitance. Discuss the apprications of
high voltage schering bridge.
tl6l
UNIT.IV
Q.4 (a) Describe the mechanism of rightning stroke
with neat sketches.
t8l
(b) Discuss the causes of over voltages in
details.
t8l
OR
Q.+ (a) Explain the wave equation for a transmission
line.
t8l
(b) Explain the factors which are considered in
designing of a line based on
lightning.
t8l

[686072] Page 2 of3
[101001

UNIT.V
Q.5 (a) What is the need to use ground wire? State how they are achieved in practice. [8]
(b) Write a short note on coordination of Insulation levels. tSl

OR

Q.5 Classiff the lightning arresters and explain each type of lightning arresters with their
advantages and limitations. t16l

16F,60721 Page 3 of3 [10100]