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Updated 2026 CW21
Certification – Quartz
Service Exam 150
Advanced Multiple-Choice
Questions well written by
best examiners in the
world 2026/2027 direct
pass !!!
Exam Title: CW21 Certification – Quartz Service
Location: Harrison, Ohio
Dates: September 21–25
Discipline: Watchmaking
Difficulty Level: Advanced / Hard
Target Audience: Professional Watchmakers Preparing for CW21 Certification
Format: Multiple Choice – One Correct Answer per Question
Total Questions: 150
Instructions: Select the single best answer for each question. Questions cover quartz
horology theory, electronic diagnostics, servicing procedures, and CW21 practical
,2
standards. Assume standard watchmaking workshop conditions and proper testing
equipment (e.g., Witschi Analyzer) unless otherwise stated.
Table of Contents
1. Quartz Theory & Oscillation Fundamentals (Questions 1–25)
2. Electronic Components: IC, Coil, Rotor & Circuitry (Questions 26–50)
3. Battery Systems & Power Management (Questions 51–70)
4. Diagnostic Testing: Current, Resistance & Voltage (Questions 71–95)
5. Movement Disassembly & Cleaning Procedures (Questions 96–115)
6. Reassembly, Lubrication & Mechanical Adjustments (Questions 116–
135)
7. Troubleshooting, Fault Diagnosis & Servicing Scenarios (Questions
136–150)
Section 1: Quartz Theory & Oscillation Fundamentals
(Questions 1–25)
🟢 1. What is the standard frequency of the quartz crystal oscillator used in nearly all
analog quartz watches?
🟢 2. In a quartz watch, what physical property of the quartz crystal is exploited to
generate a stable oscillating signal?
🟢 3. Which component is responsible for dividing the 32,768 Hz quartz oscillation
down to a 1 Hz pulse for the stepper motor?
🟢 4. Why is 32,768 Hz specifically chosen as the quartz frequency in horology?
,3
🟢 5. What is the primary function of the trimmer capacitor (or trimmer) in a quartz
movement?
🟢 6. In a quartz watch, what happens to the oscillation frequency if the quartz crystal
experiences a significant temperature increase?
🟢 7. What is the typical accuracy specification for a standard quartz watch according to
most manufacturers?
🟢 8. Which term describes the gradual change in quartz frequency over time due to
aging of the crystal?
🟢 9. What is the purpose of the reset function in a quartz movement circuit?
🟢 10. In quartz horology, what does the term “end-of-life” (EOL) indication refer to?
🟢 11. Which component converts the electrical pulse from the IC into mechanical
rotation to drive the gear train?
🟢 12. What is the primary difference between a single-step and a multi-step stepper
motor in quartz watch applications?
🟢 13. In a quartz analog watch, what is the typical duration of each motor pulse
generated by the IC?
🟢 14. Which of the following best describes the role of the stator in a quartz stepper
motor?
🟢 15. Why does the rotor of a quartz stepper motor have a permanent magnet?
🟢 16. What is the typical rotation angle per step for a standard quartz watch stepper
motor?
🟢 17. In quartz watch terminology, what does the “dividing stage” refer to?
, 4
🟢 18. Which component in a quartz circuit provides the timing reference for the IC’s
internal logic?
🟢 19. What is the primary function of the oscillator circuit in a quartz watch?
🟢 20. In a quartz watch with a seconds hand that advances once per second, how
many motor pulses are generated per minute?
🟢 21. Which type of quartz crystal cut is most commonly used in watch oscillators for
temperature stability?
🟢 22. What is the purpose of the capacitor(s) in a quartz oscillator circuit?
🟢 23. In a quartz watch, what typically happens to the oscillation frequency as the
battery voltage drops below the specified operating range?
🟢 24. Which term describes the condition where a quartz crystal loses its ability to
oscillate at the designed frequency due to mechanical shock?
🟢 25. Why do quartz watches typically require less frequent servicing than mechanical
watches?
Section 2: Electronic Components: IC, Coil, Rotor & Circuitry
(Questions 26–50)
🟢 26. What is the primary function of the integrated circuit (IC) in a quartz watch?
🟢 27. What is the typical coil resistance range for an analog quartz watch stepper
motor?
🟢 28. In quartz horology, what does “coil isolation” refer to?
🟢 29. Which test confirms whether the motor coil has an internal short circuit?
Updated 2026 CW21
Certification – Quartz
Service Exam 150
Advanced Multiple-Choice
Questions well written by
best examiners in the
world 2026/2027 direct
pass !!!
Exam Title: CW21 Certification – Quartz Service
Location: Harrison, Ohio
Dates: September 21–25
Discipline: Watchmaking
Difficulty Level: Advanced / Hard
Target Audience: Professional Watchmakers Preparing for CW21 Certification
Format: Multiple Choice – One Correct Answer per Question
Total Questions: 150
Instructions: Select the single best answer for each question. Questions cover quartz
horology theory, electronic diagnostics, servicing procedures, and CW21 practical
,2
standards. Assume standard watchmaking workshop conditions and proper testing
equipment (e.g., Witschi Analyzer) unless otherwise stated.
Table of Contents
1. Quartz Theory & Oscillation Fundamentals (Questions 1–25)
2. Electronic Components: IC, Coil, Rotor & Circuitry (Questions 26–50)
3. Battery Systems & Power Management (Questions 51–70)
4. Diagnostic Testing: Current, Resistance & Voltage (Questions 71–95)
5. Movement Disassembly & Cleaning Procedures (Questions 96–115)
6. Reassembly, Lubrication & Mechanical Adjustments (Questions 116–
135)
7. Troubleshooting, Fault Diagnosis & Servicing Scenarios (Questions
136–150)
Section 1: Quartz Theory & Oscillation Fundamentals
(Questions 1–25)
🟢 1. What is the standard frequency of the quartz crystal oscillator used in nearly all
analog quartz watches?
🟢 2. In a quartz watch, what physical property of the quartz crystal is exploited to
generate a stable oscillating signal?
🟢 3. Which component is responsible for dividing the 32,768 Hz quartz oscillation
down to a 1 Hz pulse for the stepper motor?
🟢 4. Why is 32,768 Hz specifically chosen as the quartz frequency in horology?
,3
🟢 5. What is the primary function of the trimmer capacitor (or trimmer) in a quartz
movement?
🟢 6. In a quartz watch, what happens to the oscillation frequency if the quartz crystal
experiences a significant temperature increase?
🟢 7. What is the typical accuracy specification for a standard quartz watch according to
most manufacturers?
🟢 8. Which term describes the gradual change in quartz frequency over time due to
aging of the crystal?
🟢 9. What is the purpose of the reset function in a quartz movement circuit?
🟢 10. In quartz horology, what does the term “end-of-life” (EOL) indication refer to?
🟢 11. Which component converts the electrical pulse from the IC into mechanical
rotation to drive the gear train?
🟢 12. What is the primary difference between a single-step and a multi-step stepper
motor in quartz watch applications?
🟢 13. In a quartz analog watch, what is the typical duration of each motor pulse
generated by the IC?
🟢 14. Which of the following best describes the role of the stator in a quartz stepper
motor?
🟢 15. Why does the rotor of a quartz stepper motor have a permanent magnet?
🟢 16. What is the typical rotation angle per step for a standard quartz watch stepper
motor?
🟢 17. In quartz watch terminology, what does the “dividing stage” refer to?
, 4
🟢 18. Which component in a quartz circuit provides the timing reference for the IC’s
internal logic?
🟢 19. What is the primary function of the oscillator circuit in a quartz watch?
🟢 20. In a quartz watch with a seconds hand that advances once per second, how
many motor pulses are generated per minute?
🟢 21. Which type of quartz crystal cut is most commonly used in watch oscillators for
temperature stability?
🟢 22. What is the purpose of the capacitor(s) in a quartz oscillator circuit?
🟢 23. In a quartz watch, what typically happens to the oscillation frequency as the
battery voltage drops below the specified operating range?
🟢 24. Which term describes the condition where a quartz crystal loses its ability to
oscillate at the designed frequency due to mechanical shock?
🟢 25. Why do quartz watches typically require less frequent servicing than mechanical
watches?
Section 2: Electronic Components: IC, Coil, Rotor & Circuitry
(Questions 26–50)
🟢 26. What is the primary function of the integrated circuit (IC) in a quartz watch?
🟢 27. What is the typical coil resistance range for an analog quartz watch stepper
motor?
🟢 28. In quartz horology, what does “coil isolation” refer to?
🟢 29. Which test confirms whether the motor coil has an internal short circuit?
