NCTI Final Exam: Progression Tech 2 to
3 New Update 2024/2025. Already
Passed!!
Field Tech II-III Conventional
Explain the importance of grounding in electrical circuits and how it prevents faults and injuries.
Proper grounding provides a direct path for excess electrical current to safel...
NCTI Final Exam: Progression Tech 2 to
3 New Update 2024/2025. Already
Passed!!
Field Tech II-III Conventional
Explain the importance of grounding in electrical circuits and how it prevents faults and injuries.
Proper grounding provides a direct path for excess electrical current to safely discharge into the
earth, preventing electrical shocks and equipment damage.
Discuss the steps involved in safely locking out and tagging out (LOTO) equipment before performing
maintenance.
First, disconnect the equipment from the energy source. Apply a lock and tag to indicate the
equipment is out of service. Verify the absence of energy using a testing device before proceeding with
maintenance.
What precautions should be taken when working near overhead power lines?
Maintain a safe distance from the lines, use insulated tools, and always assume the lines are live
unless de-energized by a qualified professional.
Describe the procedure for troubleshooting a malfunctioning circuit breaker.
Begin by identifying any external factors that may have caused the trip, such as overloads or
short circuits. Then reset the breaker and monitor the system for further issues, ensuring proper
function and safety.
Outline the steps required to perform a continuity test on a wire using a multimeter.
Set the multimeter to the continuity setting, connect the leads to each end of the wire, and
observe whether the multimeter beeps or displays continuity, indicating an unbroken path.
What is the purpose of a fuse in an electrical system, and how does it protect the circuit?
1
, A fuse protects the circuit by breaking the electrical connection when current exceeds a specified
limit, preventing overheating and potential fires.
Explain the difference between alternating current (AC) and direct current (DC).
AC continuously reverses direction, typically used in homes and businesses, while DC flows in one
direction, often used in batteries and electronic devices.
How do you calculate the total resistance in a series circuit?
In a series circuit, the total resistance is the sum of all individual resistances along the path of the
current.
Describe how a thermal overload relay functions and its role in protecting motors.
The thermal overload relay detects excessive current and heat in a motor circuit. When the heat
exceeds a safe level, the relay interrupts the circuit to prevent motor damage.
What is the role of a capacitor in an electrical circuit?
A capacitor stores electrical energy temporarily and releases it when needed, often used to
smooth voltage fluctuations or improve power factor.
Describe the proper method to test a three-phase motor for continuity and insulation resistance.
Use a multimeter for continuity across the three-phase terminals. Then, use a megohmmeter to
measure insulation resistance between each phase and ground.
What safety protocols should be followed when performing maintenance on energized equipment?
Use proper personal protective equipment (PPE), maintain a safe distance from live components,
and always have a second qualified person present.
Explain how to determine the appropriate wire size for a given electrical load.
The wire size is determined based on the current the load will draw and the length of the wire
run, referring to standard wire sizing charts to ensure safe operation.
2
, Describe the importance of torque settings when installing electrical connections.
Proper torque ensures secure connections without overtightening, which could damage
terminals or cause loose connections that lead to overheating.
Explain the difference between a single-phase and a three-phase power supply.
Single-phase power has one alternating current (AC) voltage cycle, commonly used in homes.
Three-phase power delivers three AC cycles, offering more efficient power distribution for industrial
applications.
Discuss the role of a circuit breaker and how it differs from a fuse.
A circuit breaker automatically interrupts the current flow when it detects an overload or short
circuit, unlike a fuse, which must be replaced after a single use.
What steps are necessary to test an electrical panel for proper operation after installation?
Perform a visual inspection, check the torque on all connections, and verify the correct voltage
and current readings with a multimeter or other testing tools.
How do you safely de-energize a power transformer for maintenance?
Follow lockout/tagout procedures, disconnect power, and verify the absence of voltage before
proceeding with any maintenance tasks.
Explain the function of a relay in an electrical control circuit.
A relay controls a high-power circuit using a low-power signal, allowing for automation and
protection in electrical systems.
What is the importance of using proper PPE when working on electrical systems?
PPE protects the worker from electrical hazards such as shocks, arc flashes, and burns, reducing
the risk of injury.
Describe how to troubleshoot a motor that is not starting.
3
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