EX-404 RGPV B.Tech

Power System-I (PS)

Previous year papers and the official syllabus are free to read, no account needed.

Previous Year Papers

6 papers, latest Jun 2025

Free

Topics as the official RGPV syllabus lists them.

Unit 1 Overview of Electrical Energy Generation 9

General background, structure and components of power network
Introduction to conventional, non-conventional & distributed generation
Effect of transmission voltage on power system economy
Selection of size of feeder
Comparison of isolated versus interconnected power system
Problems associated with modern large interconnected power system
Power plant economics – load curves, base load, peak load
Power plant economics – load factor, demand factor, diversity factor, capacity factor, utilization factor
Cost of electricity – capital cost, fuel and operation cost

Unit 1 notes

Unit 2 Transmission Line Components & Underground Cabling 11

Inductance, resistance and capacitance of transmission line
Calculation of inductance for single‑phase and three‑phase lines
Concept of GMR and GMD; symmetrical & asymmetrical configurations
Calculation of capacitance for two‑wire and three‑wire systems
Effect of ground on capacitance; charging current
Transposition of line; composite conductor; skin and proximity effect; bundle conductors
Underground cable vs overhead line comparison; classification of cables
Requirements of cable construction; capacitance of single and multi‑core cable
Economic core diameter; dielectric stress in cable; grading of cables
Ionization and heating of cables; dielectric losses and sheath loss
Thermal resistance of cables

Unit 2 notes

Unit 3 Transmission Systems & Performance of Transmission Line 8

Various transmission system types and effect of system voltage
Comparison of conductor materials for overhead systems
Short, medium and long transmission line representations (Nominal π, Nominal T, equivalent models)
Network models and ABCD constants for symmetrical & asymmetrical networks
Mathematical solution for regulation & efficiency of all line types
Surge impedance, loading, long‑line equation and its equivalent
Tuned power lines; power flow through transmission line; circle diagram
Methods of voltage control; static & rotating VAR generators; transformer control

Unit 3 notes

Unit 4 Insulator & Mechanical Design 7

Insulator and mechanical design; types of conductors for overhead lines
Types of line supports and towers; distribution of conductors over towers
Spacing between conductors; span length and sag‑tension calculations
Wind and ice loading; line support at different levels; string chart and sag template
Stringing of conductors; vibration and vibration dampers
Insulator materials; types of insulators for overhead lines; failure modes
Voltage distribution of suspension insulators; shielding and grading; string efficiency

Unit 4 notes

Unit 5 Voltage Control & Distribution System 4

AC single‑phase, three‑phase, three‑wire & four‑wire distribution systems
Kelvin’s law for most economical conductor size
Substation layout and equipment; bus‑bar configurations (single, sectionalized, double)
Main and transfer bus‑bar systems; ring mains

Unit 5 notes

Counted from 6 past EX-404 papers.

Average marks of the questions from each unit in one paper. You answer only some of them, so the total is more than the paper’s maximum.

Explain the different types of insulators used for overhead lines with neat sketches, including constructional features and comparison / advantages of suspension type over pin type for high voltage transmission

Asked 5 times: 2024, 2023, 2022, 2020
For a 3-unit suspension insulator string with given ratio of shunt (pin-to-earth) capacitance to self-capacitance, find the voltage distribution across the three units and the string efficiency.

Asked 4 times: 2025, 2024, 2023, 2019
Explain grading of insulators and the methods (grading of units and guard ring) to equalize voltage distribution and improve string efficiency.

Asked 4 times: 2024, 2023, 2020