This download link is referred from the post: PTU B.Tech 7th Semester Last 10 Years Previous Question Papers|| Punjab Technical University 2011-2021
Roll No.
Total No. of Pages : 02
--- Content provided by FirstRanker.com ---
Total No. of Questions : 18B.Tech. (Electronics & Electrical)/(EE) (2012 Onwards)
B.Tech. (Electrical & Electronics)/ (Electrical Engineering) (Sem.-7)
HIGH VOLTAGE ENGINEERING
Subject Code : BTEE-802
--- Content provided by FirstRanker.com ---
M.Code : 71931Time : 3 Hrs.
Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
- 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.
--- Content provided by FirstRanker.com ---
SECTION-A
Write briefly :
- Define the insulation co-ordination.
- Define the critical HVDC voltage for corona.
- Explain the causes of RI generation in transmission line.
- Write any four disadvantage of HVDC transmission.
- Define the streamer theory of breakdown.
- Write any four name of insulating liquid used in high voltage equipments.
- Explain the term electron attachment in gases.
- What do you understand by intrinsic strength of a solid dielectric?
- Define the front and tail times of an impulse wave.
- What is trigatron gap?
--- Content provided by FirstRanker.com ---
--- Content provided by FirstRanker.com ---
1 | M-71931 (S2)-492
--- Content provided by FirstRanker.com ---
SECTION-B
- Explain why certain corona is inherent in new EHVAC lines and HVDC lines? Why corona-loss lines are not practically possible?
- Explain any two theories that explain breakdown in commercial liquid dielectrics.
- Indicate the solid insulation application in a) cable b) power capacitor.
- Explain the phenomenon treeing and tracking in solid insulating materials under electrical stress. How does it lead to breakdown?
- Discuss any methods of measuring high dc voltages and also discuss its limitations.
--- Content provided by FirstRanker.com ---
SECTION-C
- Why is a Cock-Craft Walton circuit preferred for voltage multiplier circuits? Explain its working with a schematic diagram.
- a. Define Townsend's first and second ionization coefficients. How is the condition for breakdown obtained in a Townsend discharge?
--- Content provided by FirstRanker.com ---
b. What will be the breakdown strength of air be for small gaps (1 mm) and large gaps (20 cm) under uniform field conditions and standard atmospheric conditions? - Write short notes on the following :
a. Series and shunt compensation in EHV lines.
b. Measurement of impulse voltage.
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.
--- Content provided by FirstRanker.com ---
2 | M-71931 (S2)-492
--- Content provided by FirstRanker.com ---
This download link is referred from the post: PTU B.Tech 7th Semester Last 10 Years Previous Question Papers|| Punjab Technical University 2011-2021