04-BS-4
Worked solutions to 13 past sittings (2013–2018), 91 questions. Pick a sitting, or start from a topic below.
- 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.
- Maximum Power Transfer (12 sittings): December 2018 Q2 · May 2018 Q2 · December 2017 Q2 · May 2017 Q2 · May 2016 Q2 · December 2015 Q2 · May 2015 Q2 · December 2014 Q2 · May 2014 Q2 · December 2013 Q2 · May 2013 Q2 · Undated paper Q2
- Thévenin Equivalent (9 sittings): May 2018 Q2 · December 2017 Q2 · May 2017 Q2 · December 2015 Q2 · May 2015 Q2 · May 2014 Q2 · December 2013 Q2 · May 2013 Q2 · Undated paper Q2
- Magnetic Circuit (8 sittings): May 2018 Q5 · December 2017 Q5 · May 2017 Q5 · May 2016 Q5 · December 2015 Q5 · December 2014 Q5 · May 2014 Q5 · Undated paper Q5
- DC Bridge Network (7 sittings): May 2018 Q1 · December 2017 Q1 · May 2017 Q1 · May 2016 Q1 · May 2015 Q1 · May 2014 Q1 · May 2013 Q1
- Combinational Logic Design (6 sittings): May 2017 Q7 · May 2016 Q7 · December 2015 Q7 · May 2015 Q7 · December 2014 Q7 · Undated paper Q7
- KCL/KVL (5 sittings): May 2018 Q1 · December 2017 Q1 · May 2016 Q1 · December 2014 Q1 · May 2014 Q1
- AC Steady-State Phasor Analysis (4 sittings): May 2018 Q4 · May 2016 Q4 · December 2015 Q4 · December 2013 Q3
- Reluctance (4 sittings): December 2017 Q5 · December 2015 Q5 · December 2014 Q5 · Undated paper Q5
- Full-Wave Bridge Rectifier (3 sittings): December 2018 Q6 · May 2015 Q6 · Undated paper Q6
- Full-Wave Bridge Rectifier Design (3 sittings): May 2018 Q6 · May 2014 Q6 · May 2013 Q6
- Power (3 sittings): December 2018 Q1 · December 2017 Q3 · May 2015 Q4
- Resonance (3 sittings): December 2017 Q3 · May 2015 Q4 · December 2014 Q3
- Stored Energy (3 sittings): May 2018 Q3 · May 2017 Q3 · May 2016 Q3
- Thevenin Equivalent (3 sittings): December 2018 Q2 · May 2016 Q2 · December 2014 Q2
- AC Steady-State (2 sittings): December 2017 Q3 · May 2015 Q4
Questions by sitting
December 2018
- Question 1: DC Network -- KCL, KVL, Power, and a Current Source Solved from an Observed Voltage
- Question 2: Thevenin Equivalent and Maximum Power Transfer
- Question 3: First-Order RL Transient -- Switch Opening
- Question 4: Parallel RLC Network -- Power and Series Resonance
- Question 5: Power-Factor-Correction Capacitor Switched Across an Inductive Load
- Question 6: Full-Wave Bridge Rectifier and RC Ripple Filter
- Question 7: Magnetic Circuit -- Horseshoe Core, Air Gap, and Relay Armature
May 2018
- Question 1: DC Bridge Network — KCL/KVL, Power in R1, Power of Vs3
- Question 2: Thévenin Equivalent and Maximum Power Transfer
- Question 3: First-Order RL Transient — Steady State, Stored Energy, Time Constant, Response Plot
- Question 4: AC Steady-State Phasor Analysis — Series-Fed Parallel Resonant Load
- Question 5: Magnetic Circuit — Horseshoe Core with Armature and Air Gap
- Question 6: Full-Wave Bridge Rectifier Design
- Question 7: Combinational Logic — Two-Floor Elevator Control
December 2017
- Question 1: DC Bridge Network — KCL/KVL, Vab, Power in R4
- Question 2: Thévenin Equivalent and Maximum Power Transfer
- Question 3: AC Steady-State — Power, Branch Currents and Resonance
- Question 4: Switched Two-Source AC Loop
- Question 5: Magnetic Circuit — MMF, Reluctance and Air-Gap Flux
- Question 6: Full-Wave Rectifier and RC Low-Pass Filter Design
- Question 7: Two-Floor Elevator Control Logic
May 2017
- Question 1: DC Bridge Network — Kirchhoff's Laws and an Unknown Branch Resistance
- Question 2: Thévenin Equivalent and Maximum Power Transfer
- Question 3: Switched RL Network — Steady State, Stored Energy, and Transient Decay
- Question 4: AC Steady-State Phasor Analysis with a Resonant Tank
- Question 5: Magnetic Circuit — Horseshoe Core with Air Gap and Armature
- Question 6: Full-Bridge Rectifier and RC Low-Pass Filter
- Question 7: Combinational Logic Design — Subway Door Control
December 2016
May 2016
- Question 1: DC Bridge Network — KCL/KVL and an Unknown Source Current
- Question 2: Thevenin Equivalent and Maximum Power Transfer
- Question 3: Switched RC Network — Time Constants and Stored Energy
- Question 4: AC Steady-State Phasor Analysis
- Question 5: Magnetic Circuit — Horseshoe Core with Air Gap and Armature
- Question 6: Full-Bridge Rectifier and RC Low-Pass Filter
- Question 7: Combinational Logic Design — Subway Door Control
December 2015
- Question 1: DC Circuit — KCL, KVL, and Branch Quantities
- Question 2: Thévenin Equivalent and Maximum Power Transfer
- Question 3: First-Order RL Transient
- Question 4: AC Steady-State Phasor Analysis
- Question 5: Magnetic Circuit — Reluctance and Air-Gap Flux
- Question 6: Full-Wave Center-Tapped Rectifier and RC Filter Design
- Question 7: Combinational Logic Design — HVAC Controller
May 2015
- Question 1: DC Bridge Network — KCL, KVL, and the Unknown Source Current
- Question 2: Thévenin Equivalent and Maximum Power Transfer
- Question 3: First-Order RL Switching Transient
- Question 4: AC Steady-State — Power and Resonance
- Question 5: AC Power Flow with a Switched Power-Factor Capacitor
- Question 6: Full-Wave Bridge Rectifier and DC-Side Filter
- Question 7: Combinational Logic Design — Vehicle Alarm and Control
December 2014
- Question 1: DC Circuit – KCL/KVL and an Unknown Resistor
- Question 2: Thevenin Equivalent and Maximum Power Transfer
- Question 3: Switched RLC Circuit – Resonance and AC Power
- Question 4: AC Steady-State Phasors, Two Sources
- Question 5: Magnetic Circuit – Reluctance, Flux, and Inductance
- Question 6: Half-Wave Rectifier and RC Filter Design
- Question 7: Combinational Logic Design – Elevator Control
May 2014
- Question 1: DC Bridge Network — KCL/KVL, V ab and Power in R 4
- Question 2: Thévenin Equivalent and Maximum Power Transfer
- Question 3: AC Steady State — Series and Parallel Resonance
- Question 4: Two-Source AC Phasor Network
- Question 5: Magnetic Circuit — Relay Armature
- Question 6: Full-Wave Bridge Rectifier Design
- Question 7: HVAC Combinational Logic Design
December 2013
- Question 1: DC Ladder Network — KCL, KVL and Source Current
- Question 2: Thévenin Equivalent and Maximum Power Transfer
- Question 3: AC Steady-State Phasor Analysis
- Question 4: Switched-Capacitor First-Order Transient
- Question 5: Magnetic Circuit with an Air Gap
- Question 6: Half-Wave Rectifier and RC Smoothing Filter (Problem 6)
- Question 7: Combinational Logic for a Two-Level Lift
May 2013
- Question 1: DC Bridge Network — KCL, KVL and Solving for an Unknown Resistor
- Question 2: Thévenin Equivalent and Maximum Power Transfer
- Question 3: First-Order RL Transient Following a Switch Opening
- Question 4: AC Steady-State Phasor Analysis with Two Sources
- Question 5: AC Power Flow on a Line-Load System, With and Without a Shunt Capacitor
- Question 6: Full-Wave Bridge Rectifier Design
- Question 7: Magnetic Core with an Air Gap
Undated paper
- Question 1: DC Resistive Network — KCL, KVL, Branch Current and Source Power
- Question 2: Thévenin Equivalent and Maximum Power Transfer
- Question 3: First-Order RC Switching Transient
- Question 4: Sinusoidal Steady State — Phasors and Capacitor Current
- Question 5: Magnetic Circuit — Reluctance, MMF, Flux Density and Armature Force
- Question 6: Full-Wave Bridge Rectifier and RC Low-Pass Filter Design
- Question 7: Combinational Logic Design — Wind Turbine Pitch Controller