SACA C-202 Electric Motor Control
Systems Actual Exam (2025/2026) –
Questions with Verified Correct
Solutions
1. AC/DC Motor Theory and Components (Questions 1-14)
1. The _____ of a three-phase motor is made up of three separate sets of windings.
○ A) Rotor
○ B) Stator
○ C) Armature
○ D) Commutator Correct Answer: B) Stator Rationale: The stator provides the
rotating magnetic field in AC induction motors; per SACA C-202 Module 1, this is
essential for torque generation (SANS 10142-1, Section 4.2).
2. One of the most common NEMA frame sizes for small motors is _____.
○ A) 42
○ B) 56
○ C) 143T
○ D) 215T Correct Answer: B) 56 Rationale: NEMA 56 frames are standard for
fractional HP motors; aligns with SACA sizing guidelines for residential/industrial
applications (NEC Article 430).
3. _____ is the temperature of the air surrounding an operating motor.
○ A) Insulation class
○ B) Ambient temperature
○ C) Service factor
○ D) Torque rating Correct Answer: B) Ambient temperature Rationale: Ambient
temp (typically 40°C max) affects derating; exceeding it risks overheating (SACA
thermal management competency).
4. The _____ represents the margin of safety for operating a motor above its rated output
power.
○ A) Full-load amperage (FLA)
○ B) Locked rotor torque
○ C) Service factor
, ○ D) Efficiency rating Correct Answer: C) Service factor Rationale: SF (e.g.,
1.15) allows 15% overload without damage; critical for selection per NEC 430.7
(SACA 2025 updates).
5. An alternator has three main windings that are placed _______ degrees apart.
○ A) 90
○ B) 120
○ C) 180
○ D) 360 Correct Answer: B) 120 Rationale: 120° phase separation ensures
balanced three-phase AC output; foundational to polyphase theory (SACA AC
theory module).
6. A ___ configured distribution system has one end of each phase winding connected
together.
○ A) Delta
○ B) Wye
○ C) Open
○ D) Series Correct Answer: B) Wye Rationale: Wye (star) configuration provides
neutral for line-to-neutral loads; common in 208Y/120V systems (NEC 215.10).
7. A(n) _____ configured distribution system has each phase winding connected end-to-end
to form a loop.
○ A) Wye
○ B) Delta
○ C) Balanced
○ D) Unbalanced Correct Answer: B) Delta Rationale: Delta offers higher voltage
(e.g., 240V) without neutral; used for three-phase power distribution (SACA
schematic training).
8. A(n) _____ is a conductor that provides a return path to the source for the current
carrying conductors in the system.
○ A) Hot
○ B) Neutral
○ C) Ground
○ D) Phase Correct Answer: B) Neutral Rationale: Neutral carries unbalanced
current in wye systems; essential for single-phase loads from three-phase
sources (NEC 100 definitions).
9. The flow of electricity in only one direction is called _____ current.
○ A) AC
○ B) DC
○ C) Polyphase
○ D) Alternating Correct Answer: B) DC Rationale: DC motors use commutators
for constant polarity; contrasts with AC's sinusoidal waveform (SACA DC theory
basics).
10. Most of the electrical power in the world is _____.
○ A) DC
○ B) Single-phase AC
○ C) Three-phase AC
Systems Actual Exam (2025/2026) –
Questions with Verified Correct
Solutions
1. AC/DC Motor Theory and Components (Questions 1-14)
1. The _____ of a three-phase motor is made up of three separate sets of windings.
○ A) Rotor
○ B) Stator
○ C) Armature
○ D) Commutator Correct Answer: B) Stator Rationale: The stator provides the
rotating magnetic field in AC induction motors; per SACA C-202 Module 1, this is
essential for torque generation (SANS 10142-1, Section 4.2).
2. One of the most common NEMA frame sizes for small motors is _____.
○ A) 42
○ B) 56
○ C) 143T
○ D) 215T Correct Answer: B) 56 Rationale: NEMA 56 frames are standard for
fractional HP motors; aligns with SACA sizing guidelines for residential/industrial
applications (NEC Article 430).
3. _____ is the temperature of the air surrounding an operating motor.
○ A) Insulation class
○ B) Ambient temperature
○ C) Service factor
○ D) Torque rating Correct Answer: B) Ambient temperature Rationale: Ambient
temp (typically 40°C max) affects derating; exceeding it risks overheating (SACA
thermal management competency).
4. The _____ represents the margin of safety for operating a motor above its rated output
power.
○ A) Full-load amperage (FLA)
○ B) Locked rotor torque
○ C) Service factor
, ○ D) Efficiency rating Correct Answer: C) Service factor Rationale: SF (e.g.,
1.15) allows 15% overload without damage; critical for selection per NEC 430.7
(SACA 2025 updates).
5. An alternator has three main windings that are placed _______ degrees apart.
○ A) 90
○ B) 120
○ C) 180
○ D) 360 Correct Answer: B) 120 Rationale: 120° phase separation ensures
balanced three-phase AC output; foundational to polyphase theory (SACA AC
theory module).
6. A ___ configured distribution system has one end of each phase winding connected
together.
○ A) Delta
○ B) Wye
○ C) Open
○ D) Series Correct Answer: B) Wye Rationale: Wye (star) configuration provides
neutral for line-to-neutral loads; common in 208Y/120V systems (NEC 215.10).
7. A(n) _____ configured distribution system has each phase winding connected end-to-end
to form a loop.
○ A) Wye
○ B) Delta
○ C) Balanced
○ D) Unbalanced Correct Answer: B) Delta Rationale: Delta offers higher voltage
(e.g., 240V) without neutral; used for three-phase power distribution (SACA
schematic training).
8. A(n) _____ is a conductor that provides a return path to the source for the current
carrying conductors in the system.
○ A) Hot
○ B) Neutral
○ C) Ground
○ D) Phase Correct Answer: B) Neutral Rationale: Neutral carries unbalanced
current in wye systems; essential for single-phase loads from three-phase
sources (NEC 100 definitions).
9. The flow of electricity in only one direction is called _____ current.
○ A) AC
○ B) DC
○ C) Polyphase
○ D) Alternating Correct Answer: B) DC Rationale: DC motors use commutators
for constant polarity; contrasts with AC's sinusoidal waveform (SACA DC theory
basics).
10. Most of the electrical power in the world is _____.
○ A) DC
○ B) Single-phase AC
○ C) Three-phase AC
