Arizona Schneider Electric Controls
Technician Certification Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. In a 3-phase motor control center, what is the primary purpose of a
contactor?
A. To measure current load
B. To switch power to the motor
C. To regulate motor speed
D. To provide overload protection
The contactor’s primary function is to switch electrical power on and
off to the motor under control, acting as the main power switching
device.
2. Which device protects a motor from sustained overcurrent due to
overload conditions?
A. Contactor
B. Transformer
C. Thermal overload relay
D. Circuit breaker
A thermal overload relay senses prolonged overcurrent or excessive
heat and opens the control circuit to protect the motor from damage.
,3. What does the acronym PLC stand for in industrial controls?
A. Power Load Control
B. Programmable Logic Controller
C. Pulse Linear Converter
D. Phase Level Circuit
PLC stands for Programmable Logic Controller, a digital device used
for automation and control of machinery.
4. In ladder logic, what does a normally closed (NC) contact symbol
represent?
A. Contact closed at rest
B. Contact open at rest
C. Output coil energized
D. Fuse blown
A normally closed contact is mechanically closed when at rest but
opens when actuated, representing an open path under control
signal.
5. Which sensor type is best suited for detecting metallic objects without
physical contact?
A. Photoelectric
B. Ultrasonic
C. Inductive proximity
D. Capacitive proximity
Inductive proximity sensors generate a magnetic field to detect metal
objects without touching them.
6. A PLC scan cycle includes all of the following except:
A. Input update
B. Program execution
C. Output update
D. Memory reset
, The scan cycle reads inputs, executes the program logic, updates
outputs, and does not perform a memory reset as part of normal
operation.
7. What color is typically used for emergency stop pushbuttons?
A. Green
B. Yellow
C. Blue
D. Red
Emergency stop buttons are universally red to indicate an immediate
stop in hazardous situations.
8. Which of the following is a common PLC input device?
A. Contactor
B. Motor
C. Limit switch
D. Transformer
Limit switches provide binary input signals to PLCs based on physical
position changes.
9. What does a VFD (Variable Frequency Drive) control?
A. Voltage magnitude only
B. Motor speed and torque
C. Transformer tap settings
D. Fuse rating
A VFD controls motor speed and torque by varying output frequency
and voltage.
10. In a motor starter circuit, the auxiliary contact is used for:
A. Grounding the motor
B. Reducing voltage
C. Interlocking and sealing circuits
D. Measuring current
Technician Certification Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. In a 3-phase motor control center, what is the primary purpose of a
contactor?
A. To measure current load
B. To switch power to the motor
C. To regulate motor speed
D. To provide overload protection
The contactor’s primary function is to switch electrical power on and
off to the motor under control, acting as the main power switching
device.
2. Which device protects a motor from sustained overcurrent due to
overload conditions?
A. Contactor
B. Transformer
C. Thermal overload relay
D. Circuit breaker
A thermal overload relay senses prolonged overcurrent or excessive
heat and opens the control circuit to protect the motor from damage.
,3. What does the acronym PLC stand for in industrial controls?
A. Power Load Control
B. Programmable Logic Controller
C. Pulse Linear Converter
D. Phase Level Circuit
PLC stands for Programmable Logic Controller, a digital device used
for automation and control of machinery.
4. In ladder logic, what does a normally closed (NC) contact symbol
represent?
A. Contact closed at rest
B. Contact open at rest
C. Output coil energized
D. Fuse blown
A normally closed contact is mechanically closed when at rest but
opens when actuated, representing an open path under control
signal.
5. Which sensor type is best suited for detecting metallic objects without
physical contact?
A. Photoelectric
B. Ultrasonic
C. Inductive proximity
D. Capacitive proximity
Inductive proximity sensors generate a magnetic field to detect metal
objects without touching them.
6. A PLC scan cycle includes all of the following except:
A. Input update
B. Program execution
C. Output update
D. Memory reset
, The scan cycle reads inputs, executes the program logic, updates
outputs, and does not perform a memory reset as part of normal
operation.
7. What color is typically used for emergency stop pushbuttons?
A. Green
B. Yellow
C. Blue
D. Red
Emergency stop buttons are universally red to indicate an immediate
stop in hazardous situations.
8. Which of the following is a common PLC input device?
A. Contactor
B. Motor
C. Limit switch
D. Transformer
Limit switches provide binary input signals to PLCs based on physical
position changes.
9. What does a VFD (Variable Frequency Drive) control?
A. Voltage magnitude only
B. Motor speed and torque
C. Transformer tap settings
D. Fuse rating
A VFD controls motor speed and torque by varying output frequency
and voltage.
10. In a motor starter circuit, the auxiliary contact is used for:
A. Grounding the motor
B. Reducing voltage
C. Interlocking and sealing circuits
D. Measuring current
