Download PTU B.Tech 2021 Jan EE 7th Sem 75827 High Voltage Engineering Question Paper

Download PTU (Punjab Technical University) B.Tech (Bachelor of Technology) / BE (Bachelor of Engineering) 2021 January EE 7th Sem 75827 High Voltage Engineering Previous Question Paper

Roll No.
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech. (Electrical & Electronics Engg.) (2013 & Onwards) (Sem.?7)
HIGH VOLTAGE ENGINEERING
Subject Code : BTEE-802
M.Code : 75827
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
Write briefly :
1.
Define the tuned power line.
2.
Derive the expression of bipolar corona loss.
3.
State the principle of insulation co-ordination.
4.
Enlist any four converter station equipment.
5.
Explain the term electron attachment in gases.
6.
Write any four name of insulating liquid used in high voltage equipments.
7.
Define 1st ionization coefficient.
8.
Define the tripping and contact of impulse generator.
9.
Define the front and tail times of an impulse wave.
10. Define the intrinsic strength of solid dielectric.
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SECTION-B
11. Explain the different scheme used for shunt compensation in EHV lines using electrical
circuit and phase diagram.
12. State and explain Paschen's Law. Derive expression for (pd) min and Vbmin. Assume
A = 12, B = 365, and = 0.02 for air. Determine (pd)min and Vbmin.
13. How is a lossy dielectric represented in the form of a circuit model explain it in detail?
14. Indicate the solid insulation application in a) power cable b) power transformer.
15. An electrostatic voltmeter has two parallel plates. The movable part is 10 cm in diameter.
With 10 kV between the plates, the pull is 5 ? 10-3 N. Determine the change in capacitance
for a movement of 1 mm of movable plate.
SECTION-C
16. Why is a Cock-Craft Walton circuit preferred for voltage multiplier circuits? Explain its
working with a schematic diagram.
17. Discuss the effect of the following parameters on the break down strength of liquid :
a) Hydrastatic pressure
b) Solid impurities
c) Moisture content in the oil
18. Write short notes on the following :
a) Series and shunt compensation in EHV lines
b) Thermal breakdown of composite dielectrics.
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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