CW21 Certification –
Quartz Service Exam
150 Advanced Multiple-
Choice Questions
(V2.0) well written by
best examiners in the
world 2026/2027 direct
pass !!!
CW21 Certification – Quartz Service
AWCI Headquarters, Harrison, Ohio
September 21–25
Watchmaking
Advanced / Hard (V2.0 — Enhanced Complexity)
Professional Watchmakers Preparing for CW21 Quartz Service
Elective Certification
, Multiple Choice – One Correct Answer per Question
150
85% (recommended for CW21-level performance)
Select the single best answer for each question. Questions assume
standard watchmaking workshop conditions and proper testing equipment (Witschi Q-
Test 6000, QuartzMaster PRO, or equivalent) unless otherwise stated. The CW21 quartz
elective requires a complete service on an ETA 955.XXX family movement with E.O.L.
indicator and A.S.S.-controlled motor drive, performed to manufacturer specifications.
Answers and rationales are provided in the Answer Key section.
Table of Contents
1.
(Questions 1–25)
2.
(Questions 26–50)
3.
(Questions 51–70)
4.
(Questions 71–95)
5.
(Questions 96–115)
6.
(Questions 116–135)
7.
(Questions 136–150)
Section 1: Quartz Theory, Oscillation & Frequency Control
(Questions 1–25)
,🟢 In a quartz watch oscillator circuit, what is the primary function of the trimmer
capacitor when present on the movement?
🟢 According to ETA technical specifications, what is the minimum functioning
voltage for an ETA 955.XXX family quartz movement?
🟢 A quartz crystal in a watch oscillator operates at 32,768 Hz. What is the frequency
in the first division stage after a single divide-by-two?
🟢 Which type of quartz crystal cut is predominantly used in modern watch
oscillators for its excellent temperature-frequency characteristics?
🟢 In the context of quartz horology, what does the term “turning point
temperature” refer to?
🟢 A quartz watch is rated at -0.4 to +0.5 seconds per day by the manufacturer.
What does this specification represent?
🟢 What is the primary purpose of the oscillating circuit in a quartz movement?
🟢 In a quartz watch, what is the relationship between the quartz oscillator and the
IC’s dividing stage?
🟢 When a quartz watch is exposed to extreme cold (below 0°C), what typical
behavior is observed in timekeeping performance?
🟢 Which component in a quartz movement provides the time base reference for
all timing functions?
🟢 What is the significance of 32,768 Hz being exactly 2¹⁵ in quartz watch design?
🟢 In a quartz analog watch, what happens to the motor pulse frequency when the
IC’s dividing stage produces a 1 Hz output?
, 🟢 What is the typical tolerance for quartz crystal frequency deviation from
nominal at 25°C in a standard watch movement?
🟢 A quartz watch with a tuning fork crystal has a Q factor of approximately
100,000. What does this high Q factor indicate?
🟢 In quartz watch terminology, what does “frequency aging” refer to?
🟢 Why is the quartz crystal mounted in a vacuum or inert gas environment inside
its canister?
🟢 What is the primary effect of mechanical shock on a quartz crystal in a watch
movement?
🟢 In a quartz watch circuit, what is the function of the feedback resistor in the
oscillator circuit?
🟢 What distinguishes a “high-frequency” quartz watch (e.g., 4.194 MHz) from a
standard 32,768 Hz quartz watch?
🟢 In the context of quartz watch regulation, what does “rate adjustment” refer to?
🟢 A quartz watch consistently gains 2 seconds per day. If the movement has an
accessible trimmer capacitor, what adjustment should be made?
🟢 What is the relationship between quartz crystal thickness and oscillation
frequency?
🟢 In a quartz oscillator circuit, what is the purpose of the load capacitors (C1 and
C2)?
🟢 What happens to the quartz oscillator’s frequency stability when the load
capacitance is significantly mismatched?
🟢 In a quartz watch, what does “frequency pulling” refer to?
Quartz Service Exam
150 Advanced Multiple-
Choice Questions
(V2.0) well written by
best examiners in the
world 2026/2027 direct
pass !!!
CW21 Certification – Quartz Service
AWCI Headquarters, Harrison, Ohio
September 21–25
Watchmaking
Advanced / Hard (V2.0 — Enhanced Complexity)
Professional Watchmakers Preparing for CW21 Quartz Service
Elective Certification
, Multiple Choice – One Correct Answer per Question
150
85% (recommended for CW21-level performance)
Select the single best answer for each question. Questions assume
standard watchmaking workshop conditions and proper testing equipment (Witschi Q-
Test 6000, QuartzMaster PRO, or equivalent) unless otherwise stated. The CW21 quartz
elective requires a complete service on an ETA 955.XXX family movement with E.O.L.
indicator and A.S.S.-controlled motor drive, performed to manufacturer specifications.
Answers and rationales are provided in the Answer Key section.
Table of Contents
1.
(Questions 1–25)
2.
(Questions 26–50)
3.
(Questions 51–70)
4.
(Questions 71–95)
5.
(Questions 96–115)
6.
(Questions 116–135)
7.
(Questions 136–150)
Section 1: Quartz Theory, Oscillation & Frequency Control
(Questions 1–25)
,🟢 In a quartz watch oscillator circuit, what is the primary function of the trimmer
capacitor when present on the movement?
🟢 According to ETA technical specifications, what is the minimum functioning
voltage for an ETA 955.XXX family quartz movement?
🟢 A quartz crystal in a watch oscillator operates at 32,768 Hz. What is the frequency
in the first division stage after a single divide-by-two?
🟢 Which type of quartz crystal cut is predominantly used in modern watch
oscillators for its excellent temperature-frequency characteristics?
🟢 In the context of quartz horology, what does the term “turning point
temperature” refer to?
🟢 A quartz watch is rated at -0.4 to +0.5 seconds per day by the manufacturer.
What does this specification represent?
🟢 What is the primary purpose of the oscillating circuit in a quartz movement?
🟢 In a quartz watch, what is the relationship between the quartz oscillator and the
IC’s dividing stage?
🟢 When a quartz watch is exposed to extreme cold (below 0°C), what typical
behavior is observed in timekeeping performance?
🟢 Which component in a quartz movement provides the time base reference for
all timing functions?
🟢 What is the significance of 32,768 Hz being exactly 2¹⁵ in quartz watch design?
🟢 In a quartz analog watch, what happens to the motor pulse frequency when the
IC’s dividing stage produces a 1 Hz output?
, 🟢 What is the typical tolerance for quartz crystal frequency deviation from
nominal at 25°C in a standard watch movement?
🟢 A quartz watch with a tuning fork crystal has a Q factor of approximately
100,000. What does this high Q factor indicate?
🟢 In quartz watch terminology, what does “frequency aging” refer to?
🟢 Why is the quartz crystal mounted in a vacuum or inert gas environment inside
its canister?
🟢 What is the primary effect of mechanical shock on a quartz crystal in a watch
movement?
🟢 In a quartz watch circuit, what is the function of the feedback resistor in the
oscillator circuit?
🟢 What distinguishes a “high-frequency” quartz watch (e.g., 4.194 MHz) from a
standard 32,768 Hz quartz watch?
🟢 In the context of quartz watch regulation, what does “rate adjustment” refer to?
🟢 A quartz watch consistently gains 2 seconds per day. If the movement has an
accessible trimmer capacitor, what adjustment should be made?
🟢 What is the relationship between quartz crystal thickness and oscillation
frequency?
🟢 In a quartz oscillator circuit, what is the purpose of the load capacitors (C1 and
C2)?
🟢 What happens to the quartz oscillator’s frequency stability when the load
capacitance is significantly mismatched?
🟢 In a quartz watch, what does “frequency pulling” refer to?
