EEI TECH EEI Tech Tools and Equipment 2 — Questions and Answers
Question 1: What is the primary function of a megohmmeter (megger)?
- Measure large amounts of electrical current
- Test the insulation resistance of cables and motor windings (Correct answer)
- Detect AC versus DC voltage
- Measure electrical power consumption
Correct answer: Test the insulation resistance of cables and motor windings
A megohmmeter applies high voltage and measures resistance in megaohms, revealing degraded or compromised insulation before it causes equipment failure.
Question 2: Which device is used during electrical maintenance to prevent accidental re-energization of equipment?
- Circuit breaker locator
- Lockout/tagout (LOTO) device (Correct answer)
- Ground fault interrupter
- Voltage regulator
Correct answer: Lockout/tagout (LOTO) device
Lockout/tagout devices physically lock energy controls in the off position and attach warning tags, preventing accidental energization while maintenance is performed.
Question 3: What does an oscilloscope primarily display?
- Average power consumption over time
- The waveform of a voltage signal plotted against time (Correct answer)
- Total harmonic distortion as a numeric value
- Phase angle between voltage and current as a number
Correct answer: The waveform of a voltage signal plotted against time
An oscilloscope plots voltage against time, allowing technicians to visualize signal shape, frequency, amplitude, and timing relationships.
Question 4: A fish tape (wire puller) is primarily used to:
- Cut cable to length inside walls
- Pull electrical wire through conduit or wall cavities (Correct answer)
- Test signal strength in data cables
- Strip insulation from multiple wires at once
Correct answer: Pull electrical wire through conduit or wall cavities
Fish tape is a long, flexible steel or fiberglass tape fed through conduit or wall cavities to pull electrical wire from one location to another.
Question 5: Which tool compresses a metal terminal or connector firmly onto a wire to create a secure connection?
- Lineman's pliers
- Crimping tool (Correct answer)
- Wire stripper
- Diagonal cutters
Correct answer: Crimping tool
A crimping tool uses a shaped die to deform a connector around a wire, creating a gas-tight mechanical and electrical connection without solder.
Question 6: What advantage does a clamp meter have over a standard multimeter when measuring current?
- It measures resistance more accurately
- It measures AC current in a live conductor without disconnecting the circuit (Correct answer)
- It measures voltage of a battery faster
- It displays frequency more clearly
Correct answer: It measures AC current in a live conductor without disconnecting the circuit
A clamp meter's jaws sense current magnetically around an intact conductor, eliminating the need to break the circuit that an inline ammeter would require.
Question 7: What is the purpose of a tone generator and probe (cable tracer kit)?
- Test the voltage rating of a cable
- Identify and trace a specific cable within a bundle or wall (Correct answer)
- Measure the resistance of a long cable run
- Detect moisture inside cable insulation
Correct answer: Identify and trace a specific cable within a bundle or wall
The tone generator injects a signal into a target cable, and the inductive probe detects that tone to identify and trace the specific cable among many.
EEI TECH EEI Tech Tools and Equipment 2
What is the primary function of a megohmmeter (megger)?