Preview Questions Electrician | Role Specific Skill

Question 1: When installing a 240V circuit for a water heater, what is the required breaker size according to the NEC?

Which action should you take?

Choose only one option

20 amps

40 amps

50 amps

30 amps

Question 2: What is the NEC rule for the installation of ground rods in electrical systems?

Which action should you take?

Choose only one option

Ground rods must be installed within 6 feet of the meter

Ground rods must be 20 feet apart

Ground rods must be connected in parallel

Ground rods must be driven at least 8 feet deep

Question 3: In electrical systems installation, how should conduit be sized to accommodate multiple wires while ensuring safety and efficiency?

Which action should you take?

Choose only one option

The conduit size should be based only on the wire insulation type

The conduit size should be based on the total cross-sectional area of the conductors, plus 25% for insulation

The conduit size can be determined by the length of the run

The conduit size is determined by the voltage rating of the circuit

Question 4: In a three-phase electrical system, what is the role of a transformer?

Which action should you take?

Choose only one option

To filter out harmonic distortions from the current

To increase the current in the system

To change the voltage levels of electrical energy for distribution

To convert alternating current to direct current

Question 5: When installing a subpanel in a residential setting, what is the correct method to connect the neutral bar and ground bar?

Which action should you take?

Choose only one option

The neutral bar should be bonded directly to the ground bar

The neutral bar should be isolated from the ground bar, and separate connections should be made

The neutral bar can be grounded through the main panel

Both bars should be connected to a single grounding conductor

Question 6: What is the best method for an Electrician to ensure proper grounding and bonding in an electrical system installation?

Which action should you take?

Choose only one option

Ground the system to any available metal surface

Use the neutral conductor for grounding

Ignore grounding and rely on circuit protection

Use a separate, properly sized ground conductor connected to a ground electrode, and ensure all metallic parts are bonded