Colorado Relay Technician Certification Exam Questions and Correct Answers

COLORADO RELAY TECHNICIAN CERTIFICATION
EXAM QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) Q&A 2026 |INSTANT
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1. What is the primary function of a protective relay?
A. Increase system voltage
B. Detect faults and initiate circuit interruption
C. Store electrical energy
D. Convert AC to DC
Rationale: Protective relays monitor electrical systems and
trigger circuit breakers during abnormal conditions.
Correct Answer: B


2. Which device works directly with a relay to interrupt fault
current?
A. Transformer
B. Circuit breaker
C. Capacitor
D. Resistor
Rationale: The relay sends a trip signal to the circuit breaker to
isolate faults.
Correct Answer: B

,3. What type of relay operates based on electromagnetic
force?
A. Thermal relay
B. Solid-state relay
C. Electromechanical relay
D. Optical relay
Rationale: Electromechanical relays use magnetic fields to
move contacts.
Correct Answer: C


4. What is the purpose of relay contacts?
A. Store current
B. Open or close circuits
C. Generate voltage
D. Reduce resistance
Rationale: Contacts physically control circuit continuity.
Correct Answer: B


5. What does a normally open (NO) contact mean?
A. It is always closed
B. It closes when de-energized
C. It opens when energized
D. It closes when energized
Rationale: NO contacts complete the circuit only when the

,relay is energized.
Correct Answer: D


6. What is a normally closed (NC) contact?
A. Open when energized
B. Closed when de-energized
C. Always open
D. Opens only under overload
Rationale: NC contacts allow current flow until the relay
energizes.
Correct Answer: B


7. Which component provides isolation in solid-state relays?
A. Coil
B. Transformer
C. Optocoupler
D. Inductor
Rationale: Optocouplers isolate control and load circuits using
light.
Correct Answer: C


8. What is the unit of relay coil resistance?
A. Ohms
B. Watts

, C. Amperes
D. Volts
Rationale: Resistance is measured in ohms (Ω).
Correct Answer: A


9. What is pickup current in a relay?
A. Maximum safe current
B. Current at which relay operates
C. Fault current level
D. Zero current condition
Rationale: Pickup current is the threshold for relay activation.
Correct Answer: B


10. What is drop-out current?
A. Current that destroys relay
B. Current at which relay de-energizes
C. Maximum load current
D. Short circuit current
Rationale: Drop-out current is when the relay resets.
Correct Answer: B


11. What is the function of a relay coil?
A. Store magnetic energy
B. Generate magnetic field