MSBTE EE 5TH Semester Exam Question Paper

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of MSBTE EE 5TH Semester Exam ?

[Arun Vats]

Here is the list of few questions of
MSBTE EE 5TH Semester Exam Question Paper which you are looking for .

Q1. (A) Attempt any THREE of the following 12 Marks
a) List the different arrangements for reactors in the power system and draw the diagram of
any one.
b) How arc is formed in Circuit Breaker?
c) Define: Protective relay, relay time, pickup current and reset current.
d) Explain with neat circuit diagram the percentage differential protection of an alternator.

Q1. (B) Attempt any ONE of the following 06 Marks
a) Draw neat diagram of Puffer type SF6 Circuit Breaker and explain its operation.
b) Draw the block diagram of static over current relay and explain it’s working.

Q2. Attempt any FOUR of the following 16 Marks
a) Compare MCCB and fuse on (i) Size (ii) Cost (iii) Reliability (iv) Safety.
b) Draw the neat sketch of Air break circuit breaker and explain its working.
c) State the technical specifications of a typical Vacuum Circuit breaker.
d) State the difference between Isolator and Circuit breaker(any four points).
e) Explain with neat circuit diagram the single phasing preventer.
f) State any four frequently occurring faults in 3Induction Motor.

Q.3 Attempt any FOUR of the following 16 Marks
a) Define (i) Selectivity (ii) Speed (iii) Sensitivity & (iv) Reliability with respect to protective
relays.
b) Draw the block diagram of p based over current relay and explain the working of it in
brief.
c) Draw the neat sketch of Induction type directional over current relay.
d) Draw the neat diagram of shaded pole type electro magnetic induction relay and explain its
operation.
e) Why neutral of the transformer in a distribution sub station must be earthed?
f) Compare the Equipment earthing and Neutral earthing on any four points.

Q.4 (a) Attempt any THREE of the following 12 Marks
a) What is the difference between normal and abnormal conditions in the power system?
b) List the types of faults occurring in the power system and which is the most severe?
c) Where is Buchholz relay placed? State its limitations.
d) A 3transmission line operating at 10kV and having a resistance of 1and reactance of
4is connected to the generating station bus bars through 5 MVA step up transformer
having a reactance of 5 %. The bus bars are supplied by a 10 MVA alternator having 10%
reactance. Calculate the short circuit kVA fed symmetrical fault between phases if it occurs
at the high voltage terminals of the transformer.

Q.4 (b) Attempt any ONE of the following 06 Marks
a) Draw a neat diagram of MOCB and explain its working.
b) What is the principle of distance relaying? Explain with neat diagram. Definite distance
relay.

Q.5 Attempt any FOUR of the following 16 Marks
a) Explain with neat circuit diagram the Inter turn fault protection for alternators.
b) State and explain following faults with respect to alternator (i) Excitation failure (ii) Over
speed
c) A star connected , 3, 10 MVA ,6.6kVA alternator is protected by Mertz – Price
circulating – current principle using 1000/5 amperes current transformers. The star point of
the alternator is earthed through a resistance of 7.5 . If the minimum operating current for
3
the relay is 0.5 Amps. Calculate % of each phase of the stator winding which is unprotected
against earth faults, when the machine is operating at normal voltage.
d) Explain in brief the biased differential protection used for protection of transformers with
neat circuit diagram.
e) Explain in brief with the neat circuit diagram the restricted earth fault protection used for
transformers.
f) A 3transformer of 220/11000 line volts is connected in Y/. The protective transformers
on 220 Volts side have a current ratio of 600/5 Amps. What should be the CT ratio on
11000 Volts side?

. Q.6 Attempt any FOUR of the following 16 Marks
a) Draw neat diagram of Thyrite type lightning arrester and explain its operation.
b) What is a necessity of Insulation coordination?
c) What are the harmful effects of lightning?
d) State the abnormalities and faults in connection with busbars.
e) Explain with neat circuit diagram the fault bus protection scheme.
f) Explain with neat circuit diagram the pilot wire protection used for transmission line.