NivaarExam Prep

22-Elec-B7 Power Systems Engineering

Worked solutions to 14 past sittings (2013–2019), 97 questions. Pick a sitting, or start from a topic below.

Topics across the sittings

Topics that come up in more than one sitting, taken from the headings of our worked solutions. A topic counts once per sitting.

Questions by sitting

December 2019

  1. Question 1: Per-unit analysis of a plant distribution system
  2. Question 2: Transmission-line parameters and the two-port model
  3. Question 3: Two-generator supply and load-flow bus types
  4. Question 4: Cylindrical-rotor synchronous generator — excitation, limits and construction
  5. Question 5: Zero-sequence network and shunt-fault currents
  6. Question 6: Transient stability by the equal-area criterion

December 2018

  1. Question 1: Ferranti Effect and Long-Line ABCD Performance
  2. Question 2: Salient-Pole Machine on an Infinite Bus
  3. Question 3: Transformer Losses and the Cantilever Equivalent Circuit
  4. Question 4: Exact Two-Bus Power Flow and Reactive Compensation
  5. Question 5: Network Reduction and Three-Phase Fault Analysis
  6. Question 6: Sequence Networks and a Double Line-to-Ground Fault
  7. Question 7: Equal-Area Stability under a Sustained Fault

May 2018

  1. Question 1: Power Factor of System Equipment; Bundled-Conductor Line Parameters and the Long-Line Model
  2. Question 2: The Reactive Capability Curve and a Round-Rotor Operating Table
  3. Question 3: Transformer Behaviour on a Changed Supply Frequency; Performance from the Cantilever Equivalent Circuit
  4. Question 4: The Slack Bus, and a Three-Bus Power-Flow Solution
  5. Question 5: Transmission-Line Protection Schemes, and a Mid-Line Three-Phase Fault
  6. Question 6: Sequence Networks and a Line-to-Line Fault at the Mid-Point of a Line
  7. Question 7: Transient Stability under a Sustained Fault, by the Equal-Area Criterion

December 2017

  1. Question 1: Long transmission line — ABCD constants, sending-end conditions and power-factor correction
  2. Question 2: Armature reaction, reactive-power capability and the round-rotor operating table
  3. Question 3: Single-phase transformer — primary quantities, efficiency and regulation
  4. Question 4: Bus types, fast-decoupled power flow, and a three-bus solution
  5. Question 5: Short-circuit consequences, transformer protection, and a mid-line three-phase fault
  6. Question 6: Line-to-line fault at the mid-point of a line — fault current and phase voltages
  7. Question 7: Transient stability under a sustained fault — equal-area criterion

May 2017

  1. Question 1: Bundle-Conductor Line Parameters and the Long-Line ABCD Constants
  2. Question 2: Armature Reaction, Reactive-Power Capability and the Round-Rotor Operating Table
  3. Question 3: Three-Winding Transformer — Currents, Voltages, Powers and Efficiency
  4. Question 4: Bus Classification and a Three-Bus Power-Flow Solution
  5. Question 5: Fault Consequences, Transformer Protection and a Mid-Line Three-Phase Short
  6. Question 6: Single Line-to-Ground Fault on a Sequence-Network Representation
  7. Question 7: Transient Stability by the Equal-Area Criterion

December 2016

  1. Question 1: Bundle Conductors, Line Capacitance and the ABCD Constants
  2. Question 2: Excitation, Reactive Power and the Salient-Pole Loading Table
  3. Question 3: Transformer Losses versus Frequency, and the Cantilever Model
  4. Question 4: Two-Bus Power Flow in Closed Form
  5. Question 5: Balanced Three-Phase Fault and the Line 1–2 Current
  6. Question 6: System Grounding and Single Line-to-Ground Fault Currents
  7. Question 7: Excitation Voltage and Transient Stability under a Sustained Fault

May 2016

  1. Question 1: ABCD to equivalent pi, parallel lines, and the machine behind them
  2. Question 2: Reactive power in the system, and the two-reaction salient-pole machine
  3. Question 3: Single-phase transformer: parameters from a load test, and input power from a known impedance
  4. Question 4: Completing the bus table of a four-bus network
  5. Question 5: Fault consequences, transformer protection, and a mid-line three-phase short
  6. Question 6: Single line-to-ground fault on an industrial bus
  7. Question 7: Transient stability under a sequence of faults and switchings

December 2015

  1. Question 1: Ferranti Effect and the Long-Line Model of a 765 kV Circuit
  2. Question 2: Excitation State and the Two-Reaction Salient-Pole Generator
  3. Question 3: Transformer Losses versus Frequency and a 50 Hz Unit Run at 60 Hz
  4. Question 4: Shunt Compensation and a Two-Bus Power Flow
  5. Question 5: Consequences of Short Circuits and a Bolted Fault on a Meshed Network
  6. Question 6: Per-Unit Sequence Networks and a Line-to-Line Fault Mid-Line
  7. Question 7: Equal-Area Criterion and the Critical Clearing Angle

May 2015

  1. Question 1: Ferranti effect and the exact long-line model
  2. Question 2: Excitation state and the salient-pole generated voltage
  3. Question 3: Transformer losses versus frequency and a 50-to-60 Hz transfer
  4. Question 4: Shunt capacitor switching on a two-bus system
  5. Question 5: Consequences of short circuits and a bolted three-phase fault
  6. Question 6: Sequence networks and a double line-to-ground fault
  7. Question 7: Equal-area criterion and the critical clearing angle

December 2014

  1. Question 1: Line Transposition and the Long-Line Model
  2. Question 2: Salient-Pole versus Cylindrical Rotor, and Two Operating Points
  3. Question 3: Transformer Losses versus Frequency, and Voltage along a Feeder
  4. Question 4: Shunt Capacitors, and a Linearised Three-Bus Load Flow
  5. Question 5: Consequences of Short Circuits, and a Mid-Line Three-Phase Fault
  6. Question 6: Sequence Networks and a Single Line-to-Ground Fault
  7. Question 7: Transient Stability under a Sustained Fault

May 2014

  1. Question 1: Transmission Capacity and the ABCD Two-Port
  2. Question 2: Salient-Pole Machine on an Infinite Bus
  3. Question 3: Transformer Losses, Tests and Regulation
  4. Question 4: Bus Types and a Three-Bus Power Flow
  5. Question 5: Three-Phase Faults on a Meshed Network
  6. Question 6: System Grounding and Ground Faults on a Plant Bus
  7. Question 7: Transient Stability under a Sustained Fault

December 2013

  1. Question 1: Transposition and the Exact Long-Line ABCD Model
  2. Question 2: Excitation Control and the Salient-Pole Power-Angle Equations
  3. Question 3: Three-Winding Transformer — Star Equivalent, Powers and Efficiency
  4. Question 4: Bus Classification and a Three-Bus Power-Flow Calculation
  5. Question 5: Short-Circuit Consequences, Transformer Protection, and a Mid-Line Three-Phase Fault
  6. Question 6: Sequence Networks and Single Line-to-Ground Faults
  7. Question 7: Transient Stability by the Equal-Area Criterion

May 2013

  1. Question 1: Line Parameters and the ABCD Two-Port Model
  2. Question 2: Line Transposition and the Salient-Pole Machine
  3. Question 3: Transformer Insulating Oil and the Cantilever Equivalent Circuit
  4. Question 4: Bus Classification and a Three-Bus Power Flow
  5. Question 5: Bolted Three-Phase Fault on a Two-Machine Network
  6. Question 6: Unsymmetrical Faults Seen at Breaker B 2
  7. Question 7: Transient Stability by the Equal-Area Criterion

Undated paper

  1. Question 1: Bundle Conductors and ABCD Performance of an 1800 kV Line
  2. Question 2: Reactive Power Sources and a Salient-Pole Operating Table
  3. Question 3: Frequency Change and the Cantilever Transformer Model
  4. Question 4: Bus Types and a Three-Bus Power-Flow Table
  5. Question 5: Three-Phase Bolted Fault on a Meshed Four-Generator System
  6. Question 6: System Grounding of an Industrial Distribution Bus
  7. Question 7: Equal-Area Stability under a Sustained Mid-Line Fault