AK Electrical Administrator – Controls
Exam Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the primary purpose of a PID controller in an electrical
control system?
A. Convert AC to DC
B. Maintain a process variable at a desired setpoint
C. Provide overcurrent protection
D. Control power factor
B
A PID controller continuously adjusts output to keep a process variable
(temperature, pressure, speed) close to a setpoint.
2. In control wiring diagrams, what does a dashed line typically
represent?
A. High-voltage conductor
B. Hidden mechanical linkage
C. Protective ground
D. Power supply
B
Dashed lines in control diagrams usually indicate mechanical connections
or linkages not electrically energized.
,3. A 4–20 mA control signal is primarily used because:
A. It is cheaper than voltage control
B. Current loops avoid signal loss over distance
C. It uses less copper
D. It is easier to read visually
B
Current signals are resistant to line loss and electrical noise, ideal for long-
distance industrial control wiring.
4. What does an analog input module typically measure?
A. Start/stop commands
B. Digital ON/OFF status
C. Continuous variable signals
D. Relay cycle counts
C
Analog modules accept continuous variable values such as 4–20 mA, 0–10
V, or temperature sensor outputs.
5. Which device converts a mechanical position into an electrical signal?
A. Contactor
B. Transducer
C. Circuit breaker
D. Overload relay
B
A transducer converts one form of energy to another, such as motion to an
electrical output.
6. In a PLC, the scan cycle includes:
, A. Input check → Program execution → Output update
B. Output update → Program execution → Input check
C. Memory erase → Output update → Input check
D. Program compile → Output update → Memory test
A
The PLC scan begins with reading inputs, then running logic, then writing
outputs.
7. Which NEC article covers control panels for industrial machinery?
A. 430
B. 409
C. 725
D. 300
B
NEC 409 applies to industrial control panels and their construction
requirements.
8. A relay coil is energized. What happens to the normally closed
contacts?
A. They remain closed
B. They open
C. They short-circuit
D. They latch permanently
B
Energizing the coil opens NC contacts and closes NO contacts.
9. Which device protects motors from overload conditions?
A. Fuse
B. Contactor
C. Overload relay
Exam Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the primary purpose of a PID controller in an electrical
control system?
A. Convert AC to DC
B. Maintain a process variable at a desired setpoint
C. Provide overcurrent protection
D. Control power factor
B
A PID controller continuously adjusts output to keep a process variable
(temperature, pressure, speed) close to a setpoint.
2. In control wiring diagrams, what does a dashed line typically
represent?
A. High-voltage conductor
B. Hidden mechanical linkage
C. Protective ground
D. Power supply
B
Dashed lines in control diagrams usually indicate mechanical connections
or linkages not electrically energized.
,3. A 4–20 mA control signal is primarily used because:
A. It is cheaper than voltage control
B. Current loops avoid signal loss over distance
C. It uses less copper
D. It is easier to read visually
B
Current signals are resistant to line loss and electrical noise, ideal for long-
distance industrial control wiring.
4. What does an analog input module typically measure?
A. Start/stop commands
B. Digital ON/OFF status
C. Continuous variable signals
D. Relay cycle counts
C
Analog modules accept continuous variable values such as 4–20 mA, 0–10
V, or temperature sensor outputs.
5. Which device converts a mechanical position into an electrical signal?
A. Contactor
B. Transducer
C. Circuit breaker
D. Overload relay
B
A transducer converts one form of energy to another, such as motion to an
electrical output.
6. In a PLC, the scan cycle includes:
, A. Input check → Program execution → Output update
B. Output update → Program execution → Input check
C. Memory erase → Output update → Input check
D. Program compile → Output update → Memory test
A
The PLC scan begins with reading inputs, then running logic, then writing
outputs.
7. Which NEC article covers control panels for industrial machinery?
A. 430
B. 409
C. 725
D. 300
B
NEC 409 applies to industrial control panels and their construction
requirements.
8. A relay coil is energized. What happens to the normally closed
contacts?
A. They remain closed
B. They open
C. They short-circuit
D. They latch permanently
B
Energizing the coil opens NC contacts and closes NO contacts.
9. Which device protects motors from overload conditions?
A. Fuse
B. Contactor
C. Overload relay
