About Denken EX Second Class Primary
A study app for the Second-Class Chief Electrical Engineer primary examination. Includes 540 official past questions and 540 detailed explanations across 18 examination years, 2009–2026, covering Theory, Power, Machinery and Regulations. Bundle ID: jp.denkenex.second.primary. Learning content is in Japanese.
Free content and purchases
All 60 questions across four subjects for 2026 (Reiwa 8) and 2025 (Reiwa 7) are free. These free years are fixed and do not automatically roll forward. The other 480 questions across 16 years are covered by one-time subject unlocks. Japan prices: JPY 500 per individual subject; remaining 1/2/3 subjects JPY 450/900/1,350; all four subjects JPY 1,800. A remaining-subject set unlocks only the listed unowned subjects; its price does not include earlier payments. No subscription. The app displays the local-currency price returned by StoreKit; confirm the final price at purchase.
How to study
Choose a subject and year, select or enter answers, then grade to review the results and explanations. Use the bookmark for review and the pencil icon for handwritten notes. For Theory and Machinery, only one of the alternative questions 7/8 counts toward the annual score. The app UI and learning materials are Japanese.
Restore purchases / pending purchases
Use the same Apple Account and open Settings → subject unlock / restore purchases → Restore Purchases. Use Check Purchase Status for pending purchases, or Reload Products and Prices if prices are unavailable. Purchases in other Denken EX apps do not unlock this app. Refund requests are handled through Apple.
Study data and handwritten notes
Answers, history, bookmarks and handwritten notes are stored on your device. The app does not provide its own server storage, iCloud sync or cross-device sync. Restoring purchases restores access rights, not study data. Uninstalling the app or device failure may cause data loss. OS backups depend on Apple and device settings; restoration is not guaranteed by this app.
Handwritten notes
Select pen, eraser, color and width; add pages as needed. Use two fingers to scroll and zoom. If a save error appears, keep the screen open and check free device storage.
Sources and contact
Source: official examination questions and answers published by the Electrical Engineer Examination Center. Text and formulas are structured and diagrams cropped for app display; independent explanations are added. This is not an official Center app and does not guarantee examination success. Report errors with year, subject and question number to tklab.support.contact@gmail.com. Include app/OS version and symptoms; do not send passwords or card details.
Materials and legal context
Only official past questions are included; there are no original or dummy questions. Explanations are not authored or supervised by the examination center. Statutory questions reflect their examination year and stated assumptions; current legal accuracy or examination success is not guaranteed.