RVTI Level 3 Electrical Specialist Certification Exam Questions And 100% Correct Answers (Verified Answers) 2026/2027 | Graded A+ | Guaranteed Pass.

RVTI Level 3 Electrical Specialist Certification Exam Questions And 100% Correct Answers (Verified Answers) 2026/2027 | Graded A+ | Guaranteed Pass. 1. Which of the following is the primary function of a circuit breaker? a) To increase voltage in a circuit b) To convert AC to DC c) To protect electrical circuits from overcurrent d) To measure current flow Circuit breakers automatically interrupt current flow when it exceeds a safe level, preventing damage and fire hazards. 2. What is the purpose of a grounding conductor in an electrical system? a) To carry normal operating current b) To increase circuit resistance c) To provide a safe path for fault current d) To reduce voltage A grounding conductor ensures that fault current safely travels to the earth, minimizing shock hazards. 3. Which type of wiring method is typically used for commercial buildings? a) NM cable (Romex) b) Conduit wiring c) Knob-and-tube d) Flexible cords Conduit wiring protects wires in commercial settings and allows for future modifications. 4. The unit of electrical resistance is: a) Ampere b) Ohm c) Volt d) Watt Resistance is measured in ohms (Ω), which quantifies how much a material opposes current flow. 6. In a single-phase AC system, the voltage between the neutral and hot wire is: a) Zero b) 120 volts (in standard US residential systems) c) 240 volts d) 480 volts Residential single-phase systems typically provide 120 V between hot and neutral and 240 V across two hots. 7. What does the term "short circuit" refer to? a) High voltage drop across a load b) A low-resistance connection bypassing the load c) Normal current flow in a circuit d) A device that increases current A short circuit occurs when current bypasses the designed path, potentially causing overheating or fire. 8. Which device is used to step down voltage in an electrical system? a) Generator b) Transformer c) Capacitor d) Circuit breaker A transformer reduces voltage from high to low levels while maintaining power. 9. Which instrument is used to measure electrical current? a) Voltmeter b) Ammeter c) Ohmmeter d) Wattmeter Ammeters measure current flow in amperes and must be connected in series with the circuit. 5. Which color is commonly used for grounding conductors in the US? a) Black b) Red c) Green d) White Green (or bare copper) identifies grounding conductors according to the NEC. 10. What is the main advantage of using a three-phase electrical system? a) It requires fewer wires than single-phase b) It provides more efficient power delivery for large loads c) It eliminates the need for grounding d) It converts AC to DC Three-phase systems are more efficient for industrial and large commercial power distribution. 11. What is the purpose of a fuse in an electrical circuit? a) To step up voltage b) To measure current c) To protect circuits from overcurrent by melting d) To provide energy storage Fuses interrupt current flow when it exceeds the rated limit, preventing damage to equipment. 14. What is the function of a contactor in an electrical circuit? a) To measure current b) To switch power circuits remotely c) To store energy d) To provide insulation Contactors allow control circuits to switch high-power devices safely. 15. Which of the following is a type of AC motor starting method? a) Direct-on-line b) Star-delta c) Autotransformer d) All of the above