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Second-class amateur radio operator September 2020 A-3

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Second-class amateur radio operator September 2020 Engineering A-1

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Second-class amateur radio operator November 2025 Engineering A-7

Second-class amateur radio engineer, November 2025, A-4

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Second-class amateur radio operator, May 2025, Engineering A3

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"The Electrician's Brain Exercise" Review 82 Bridge Circuits

"The Old Electrician's Brain Exercise" Review 81 DC Circuits

The handwriting error was discovered more than 50 years later.

"The Old Electrician's Brain Exercise" Review 80 DC Circuits

"The Electrician's Brain Exercise" Review 79 Iron Loss and Copper Loss

"The old electrician's brain exercise" Three types of 90V 3T copper loss comparison

"The Old Electrician's Brain Exercise" Review 78 Parallel Operation of Transformers 1

"The Old Electrician's Head Exercise" Type 3, 2013, Question 15a

"Old Electrician's Head Exercise" 3rd Class 2011 Problem B

"Old Electrician's Head Exercise" 3rd Class 2007 Question 7

"The Old Electrician's Brain Exercise" Review 77, Part 7: Short Circuit Current

"The Old Electrician's Brain Exercise" Review 76, Part 5

"The Old Electrician's Brain Exercise" Review 75 Part 4 Short Circuit Test

"The Old Electrician's Brain Exercise" Review 74 Part 3

"The Old Electrician's Head Exercise" Review 73 Part 2

"The Old Electrician's Head Exercise" Review 72 Part 1

"Experience the Head of an Electrician" '96 Transformer B Problem: Iron Loss

"The Old Electrician's Brain Exercise" Review 71 Tap Voltages

"The Old Electrician's Brain Exercise" '96 Transformer a

"The Old Electrician's Brain Exercise" '92 Transformer

"Brain Exercises for Old Electricians" Review: 70 Tap Voltages and Secondary Voltages

"Brain Exercises for Old Electricians" Review 69 Tap Voltage and Secondary Voltage

"The Electrician's Brain Exercise" Review 68 Supply Voltage and Taps

"The Electrician's Brain Exercise" Review 67 Supply Voltage

"The Old Electrician's Brain Exercise" Review 66 Winding Ratios

"The Old Electrician's Brain Exercise" Review 65ΔΔZ

"The Old Electrician's Brain Exercise" Review 64Δ YZ

"The Old Electrician's Brain Exercise" Review 63Y ΔZ

"The Old Electrician's Brain Exercise" Review 62ΔYZ

"The Old Electrician's Head Exercise" Review 61Y ΔZY

"The Old Electrician's Brain Exercise" Review 60Δ Y Circuit

"The Old Electrician's Brain Exercise" Review 59Y Delta Circuit

"The Old Electrician's Brain Exercise" Review 58Δ Δ Circuit

"The Old Electrician's Brain Exercise" Review 57Y Y Connection

"Old Electrician's Head Exercise" 3rd Class 1989 Problem B

"Old Electrician's Head Exercise" 3rd Class 1989 Problem A

"Old Electrician's Head Exercise" 3rd Class 1991 A Question

"Old Electrician's Head Exercise" 3rd Class 1992 A Questions

"Old Electrician's Head Exercise" 3rd Class 1990 A Questions

Three types of 2011 A questions

"Old Electrician's Head Exercise" 3rd Class, 1992, Question B