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Nov Dec 2017.pdf-Total No. of Questions : 10]
Nov_Dec_2017.pdf-Total No. of Questions : 10]
Nov Dec 2017.pdf-Total No. of Quest...
Nov_Dec_2017.pdf-Total No. of Questions : 10]
Page 1
Total No. of Questions : 10]
[Total No. of Pages : 3
[5254]-632
B.E.
(Electrical)
SWITCHGEAR & PROTECTION
(2012 Pattern) (Semester - II)
Time : 2½ Hours]
[Max. Marks : 70
Instructions to the candidates:
1)
Answer Q. No.1 or 2, Q.No.3 or 4, Q. No.5 or 6, Q. No.7or 8, Q. No.9 or 10
2)
Neat diagrams must be drawn wherever necessary.
3)
Figures to the right indicate full marks.
4)
Use of electronic pocket calculator is allowed.
5)
Assume suitable data, if necessary.
P2298
Q1)
a)
What are essential qualities of protective relaying.
[6]
b)
Write a short note on current chopping.
[4]
OR
Q2)
a)
Explain the following terms w.r.t. circuit breaker.
[6]
i)
Restriking voltage.
ii)
R.R.R.V.
iii)
Recovery voltage
b)
An instantaneous value of magnetizing current of 5.5 A in a 132 kV
transmission line having line to ground capacitance of 0.015 µF and
inductance of 5 H is required to be interrupted. Determine
[4]
(i)
the voltage across the contacts of circuit breaker at the time of
current interruption.
(ii)
the resistance to be inserted in the contacts in order to avoid
restriking voltage.
P.T.O.
SEAT No. :
CEGP013091
49.248.216.238 16/11/2017 14:02:47
CEGP013091
49.248.216.238 16/11/2017 14:02:47
CEGP013091
49.248.216.238 16/11/2017 14:02:47
Page 2
[5254]-632
2
Q3)
a)
Explain construction and working of vacuum circuit breaker.
[6]
b)
Explain the term resistance switching.
[4]
OR
Q4)
a)
Explain current graded overcurrent protection scheme.
[4]
b)
Explain puffer type SF6 circuit breaker.
[6]
Q5)
a)
Compare static relays with electromechanical relays with respect to
construction, working principle, advantages and limitations.
[8]
b)
Compare gap type and gapless type lightning arresters.
[8]
OR
Q6)
a)
Write a short note on :
[8]
i)
Anti-Aliasing filter.
ii)
Sampling theorem.
b)
With suitable diagram explain construction and working of Rod-gap
arrester. `
[8]
Q7)
a)
Explain the phenomenon of overfluxing in the transformer and protection
used against it.
[9]
b)
A 3 phase 12 kV alternator winding is required to be protected against
earth
faults. The 80% of winding is protected against earth faults by a
relay having pick up current of 1 Amp. The CT has a ratio of 1000/5.
Calculate resistance to be connected between neutral and ground. If
resistance of 10 ohms is connected between neutral to ground, how
much percentage of winding is protected against earth fault.
[9]
OR
Q8)
a)
Explain protection against single phasing in 3 phase induction motor.
[9]
b)
Explain the abnormal conditions like unbalance loading, overspeeding
and loss of prime mover in case of alternator.
[9]
CEGP013091
49.248.216.238 16/11/2017 14:02:47
CEGP013091
49.248.216.238 16/11/2017 14:02:47
CEGP013091
49.248.216.238 16/11/2017 14:02:47
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