Download PTU B.Tech 2020 March EE 9th Sem High Voltage Engineering Question Paper

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Roll No. [ TTTTTT] [ ] Total No. of Pages : 02

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INSTRUCTIONS TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

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SECTION-A

1. Answer briefly :
   1. Define the tuned power line.
   2. Derive the expression of corona loss.
   3. Define the composite dielectrics.
   4. Define the intrinsic strength of solid dielectric.

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   5. Write any four application of insulating material in high voltage equipments.
   6. Write any four name of insulating liquid used in high voltage equipments.
   7. Define the ionization process in gases during the breakdown phenomena.
   8. Define the tripping and contact of impulse generator.
   9. Define the front and tail times of an impulse wave.

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   10. Write the name of different converter station equipments.

SECTION-B

2. Explain the suspended particle theory of liquids breakdown.
3. 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.

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4. How is a lossy dielectric represented in the form of a circuit model explain it in detail?
5. What is a trigatron? Explain its functions and operations.
6. 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 x 10^-6 N. Determine the change in capacitance for a movement of 1 mm of movable plate.

SECTION-C

7. Why is a Cock-Craft Walton circuit preferred for voltage multiplier circuits? Explain its working with a schematic diagram.

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8. Discuss the effect of the following parameters-on-the break down strength of liquid:
   1. Hydrastatic pressure
   2. Solid impurities
   3. Moisture content in the oil
9. Write short notes on the following :
   1. Series and shunt compensation in EHV lines

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   2. 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.