Download PTU B-Tech EEE 2020 Dec 5th Sem 70567 Power System Ii Question Paper

Download PTU (I.K.Gujral Punjab Technical University (IKGPTU)) B-Tech (Bachelor of Technology) (EEE)- Electrical And Electronics Engineering 2020 December 5th Sem 70567 Power System Ii Previous Question Paper

Roll No.
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech. (Electronics & Electrical Engg.) (2012 to 2017)/
(Electrical & Electronics Engg.) (2013 Onwards)
(Sem.?5)
POWER SYSTEM ? II
Subject Code : BTEE-502
M.Code : 70567
Time : 3 Hrs. Max. Marks : 60
INST RUCT IONS T O CANDIDAT ES :
1 .
SECT ION-A is COMPULSORY cons is ting of TEN questions carrying TWO marks
each.
2 .
SECT ION-B c ontains F IVE questions c arrying FIVE marks eac h and s tud ents
have to atte mpt any FOUR q ues tions.
3 .
SECT ION-C contains THREE questions carrying T EN marks e ach and s tudents
have to atte mpt any T WO questio ns.
SECTION-A
Answer briefly :
1.
Write and explain common arrangements of bus-bars in a substation.
2.
Explain various ratings associated with a fuse.
3.
What are the two types of protection such as equipment protection and system
protection?
4.
What are the functions of a relay and a circuit breaker?
5.
Explain the principle of differential protection for transmission line protection.
6.
Show how restriking transients can be damped by connecting a resistance across the
contacts of a circuit breaker.
7.
Explain various schemes of neutral grounding.
8.
Explain carrier current protection of transmission lines.
9.
Explain the operation of Buchholz relay.
10. Write a short note on SF6CB.
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SECTION-B
11. Explain characteristics of electromagnetic and thermal relays.
12. What are the different faults in a transformer? Explain protection schemes for
transformers.
13. Describe and compare three generation of relays such as electromagnetic relays, solid
state relays and numerical relays.
14. Give a brief introduction to lightning protection. Explain various devices used for
protection against overvoltage.
15. Explain the uses of oil CB, air blast CB, and vacuum CB.
SECTION-C
16. Explain principle of operation of a circuit breaker. Derive an expression for rate of rise of
restriking voltage (RRRV) and explain the effect of this on the operation of circuit
breaker under fault condition.
The data of a 50 Hz generator is given : Line to ground voltage 7.5 kV, reactance of
generator and connected system 4 ohm, distributed capacitance to neutral 0.01 micro
farad, and negligible resistance. Find :
a) The maximum voltage across the contacts of circuit breaker when it breaks short
circuit current while passing through zero.
b) The frequency of the transient oscillation.
c) The average rate of rise of voltage up to first peak of oscillation.
17. Explain various faults in generators. Explain various schemes for stator and rotor
protection.
18. Explain the protection schemes deployed for the protection of transmission lines.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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