22-Elec-A6 Power Systems and Machines
Worked solutions to 14 past sittings (2013–2019), 77 questions. Pick a sitting, or start from a topic below.
- December 2019
- December 2018
- May 2018
- December 2017
- May 2017
- December 2016
- May 2016
- December 2015
- May 2015
- December 2014
- May 2014
- December 2013
- May 2013
- Undated paper
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.
- Efficiency (8 sittings): December 2019 Q2 · December 2018 Q2 · May 2018 Q2 · December 2016 Q2 · May 2014 Q3 · December 2013 Q3 · May 2013 Q3 · Undated paper Q2
- Regulation (5 sittings): December 2017 Q3 · December 2016 Q2 · May 2014 Q3 · December 2013 Q3 · May 2013 Q3
- Single-Phase Transformer (5 sittings): December 2017 Q3 · May 2016 Q4 · May 2014 Q3 · December 2013 Q3 · May 2013 Q3
- Three-Phase Squirrel-Cage Induction Motor (5 sittings): December 2017 Q2 · December 2016 Q3 · May 2016 Q5 · December 2013 Q6 · May 2013 Q2
- DC Shunt Motor (4 sittings): December 2017 Q1 · December 2016 Q4 · May 2016 Q3 · May 2013 Q1
- SC Tests (4 sittings): December 2019 Q3 · December 2018 Q3 · May 2018 Q3 · Undated paper Q3
- Tests (4 sittings): December 2017 Q3 · May 2014 Q3 · December 2013 Q3 · May 2013 Q3
- Field Weakening (3 sittings): December 2017 Q1 · May 2014 Q4 · May 2013 Q1
- Machines (3 sittings): December 2019 Q5 · December 2018 Q5 · Undated paper Q5
- Magnetic Circuit of a Toroid (3 sittings): December 2019 Q1 · December 2018 Q1 · Undated paper Q1
- Power Factor (3 sittings): December 2019 Q4 · December 2018 Q4 · Undated paper Q4
- Power-Factor Correction (3 sittings): May 2016 Q1 · May 2014 Q1 · December 2013 Q1
- Short-Answer Concepts in Power Systems (3 sittings): December 2019 Q5 · December 2018 Q5 · Undated paper Q5
- Transformer Equivalent Circuit from OC (3 sittings): December 2019 Q3 · December 2018 Q3 · Undated paper Q3
- Transformer Short-Circuit Test (3 sittings): December 2019 Q2 · December 2018 Q2 · Undated paper Q2
Questions by sitting
December 2019
- Question 1: Magnetic Circuit of a Toroid
- Question 2: Transformer Short-Circuit Test and Efficiency
- Question 3: Transformer Equivalent Circuit from OC and SC Tests
- Question 4: Combined Load with a Synchronous Motor — Power Factor
- Question 5: Short-Answer Concepts in Power Systems and Machines
December 2018
- Question 1: Magnetic Circuit of a Toroid
- Question 2: Transformer Short-Circuit Test and Efficiency
- Question 3: Transformer Equivalent Circuit from OC and SC Tests
- Question 4: Combined Load with a Synchronous Motor — Power Factor
- Question 5: Short-Answer Concepts in Power Systems and Machines
May 2018
- Question 1: Toroidal Magnetic Circuit
- Question 2: Transformer Series Impedance and Efficiency
- Question 3: Equivalent Circuit from OC and SC Tests
- Question 4: Power-Factor Correction with a Synchronous Motor
- Question 5: Short-Answer Concepts
December 2017
- Question 1: DC Shunt Motor — Rating and Field Weakening
- Question 2: Three-Phase Squirrel-Cage Induction Motor
- Question 3: Single-Phase Transformer — Tests, Equivalent Circuit, Regulation
- Question 4: Delta-Connected Synchronous Generator
- Question 5: Short-Answer Concepts (a)–(j)
May 2017
- Question 1: Short-answer concepts
- Question 2: Single-phase transformer performance
- Question 3: Wound-rotor induction motor
- Question 4: Shunt DC motor with field weakening
- Question 5: Plant power-factor correction with a synchronous motor
December 2016
- Question 1: Three-Phase Plant Loads and Two-Wattmeter Method
- Question 2: Single-Phase Transformer Parameters, Efficiency and Regulation
- Question 3: Three-Phase Squirrel-Cage Induction Motor
- Question 4: DC Shunt Motor
- Question 5: Synchronous Motor on an Infinite Bus
- Question 6: Series-Parallel Magnetic Circuit with Air Gap
May 2016
- Question 1: Feeder Analysis and Power-Factor Correction
- Question 2: Three-Phase Y Load, Motor Addition and PF Correction
- Question 3: DC Shunt Motor
- Question 4: Single-Phase Transformer — OC/SC Tests
- Question 5: Three-Phase Squirrel-Cage Induction Motor
- Question 6: Parallel Synchronous Generators — Governor Droop
- Question 7: Series–Parallel Magnetic Circuit
December 2015
- Question 1: Three-Phase Power
- Question 2: Transformers
- Question 3: DC Motors
- Question 4: Induction Motors
- Question 5: Synchronous Machines
May 2015
- Question 1: General Knowledge
- Question 2: Single-Phase Transformer Tests and Performance
- Question 3: Three-Phase Induction Motor Performance
- Question 4: DC Shunt Motor with Field Weakening
- Question 5: Synchronous Motor and Synchronous-Condenser Operation
December 2014
- Question 1: Part A: Multiple-Choice (20 questions)
- Question 2: Induction Motor
- Question 3: Transformer (Short-Circuit Analysis)
- Question 4: Three-Phase Power
- Question 5: Synchronous Machine
- Question 6: DC Motor
May 2014
- Question 1: Two-Wattmeter Measurement and Power-Factor Correction
- Question 2: Two-Window Magnetic Circuit with Air Gaps
- Question 3: Single-Phase Transformer — Tests, Efficiency and Regulation
- Question 4: Separately-Excited / Shunt DC Motor — Field Weakening
- Question 5: Synchronous Generator on an Infinite Bus
- Question 6: Three-Phase Induction Motor Performance
December 2013
- Question 1: Two-Wattmeter Method and Power-Factor Correction
- Question 2: Magnetic Circuit with Air Gap and Nonlinear Core
- Question 3: Single-Phase Transformer — Tests, Efficiency, Regulation
- Question 4: Synchronous Generator on an Infinite Bus
- Question 5: DC Shunt Motor Performance
- Question 6: Three-Phase Squirrel-Cage Induction Motor
May 2013
- Question 1: DC Shunt Motor — Field Weakening
- Question 2: Three-Phase Squirrel-Cage Induction Motor
- Question 3: Single-Phase Transformer — Tests, Efficiency, Regulation
- Question 4: Three-Phase Synchronous Generator
- Question 5: Magnetic Circuit of a Two-Pole Machine
- Question 6: Two Generators Supplying a Common Load Bus
Undated paper
- Question 1: Magnetic Circuit of a Toroid
- Question 2: Transformer Short-Circuit Test and Efficiency
- Question 3: Transformer Equivalent Circuit from OC and SC Tests
- Question 4: Combined Load with a Synchronous Motor — Power Factor
- Question 5: Short-Answer Concepts in Power Systems and Machines