This download link is referred from the post: PTU B.Tech 7th Semester Last 10 Years Previous Question Papers|| Punjab Technical University 2011-2021
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Roll No.
Total No. of Questions : 18
Total No. of Pages : 02
B.Tech. (Electrical & Electronics Engg.) (2013 & Onwards) (Sem.-7)
HIGH VOLTAGE ENGINEERING
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Subject Code : BTEE-802
M.Code : 75827
Time: 3 Hrs.
Max. Marks: 60
INSTRUCTIONS TO CANDIDATES:
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- SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
- SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
- SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.
SECTION-A
Write briefly :
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- Define the tuned power line.
- Derive the expression of bipolar corona loss.
- State the principle of insulation co-ordination.
- Enlist any four converter station equipment.
- Explain the term electron attachment in gases.
- Write any four name of insulating liquid used in high voltage equipments.
- Define 1st ionization coefficient.
- Define the tripping and contact of impulse generator.
- Define the front and tail times of an impulse wave.
- Define the intrinsic strength of solid dielectric.
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1 | M-75827
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SECTION-B
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- Explain the different scheme used for shunt compensation in EHV lines using electrical circuit and phase diagram.
- State and explain Paschen's Law. Derive expression for (pd) min and Vbmin. Assume A = 12, B = 365, and y = 0.02 for air. Determine (pd)min and Vbmin.
- How is a lossy dielectric represented in the form of a circuit model explain it in detail?
- Indicate the solid insulation application in a) power cable b) power transformer.
- 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.
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SECTION-C
- Why is a Cock-Craft Walton circuit preferred for voltage multiplier circuits? Explain its working with a schematic diagram.
- 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
- 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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2 | M-75827
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This download link is referred from the post: PTU B.Tech 7th Semester Last 10 Years Previous Question Papers|| Punjab Technical University 2011-2021