100+ ITI Electrician Interview Questions and Answers

A polyphase meter typically has three terminals.

• Polyphase meters are used to measure electrical energy in three-phase systems.

• These meters have three terminals, each corresponding to a phase (usually labeled as L1, L2, and L3).

• The three-phase system allows for more efficient power distribution and is commonly used in industrial and commercial settings.

• Examples of polyphase meters include electromechanical induction meters and electronic digital meters.

A multimeter and power tester are both electrical testing tools, but they have different functions and uses.

• A multimeter is a versatile tool that can measure voltage, current, and resistance. It is used for troubleshooting electrical circuits, testing components, and checking continuity.

• A power tester, also known as a voltage tester or circuit tester, is used to determine if electrical power is present in a circuit. It is mainly used for safety purposes to ensure that circuit...read more

Ampere is the unit of electric current, which is the flow of electric charge. It measures the rate of flow of electrons in a circuit.

• Ampere is the SI unit of electric current, symbolized by 'A'.

• It represents the rate of flow of electric charge in a circuit.

• 1 ampere is equal to 1 coulomb of charge passing through a point in 1 second.

• Current is measured using an ammeter in a circuit.

• Example: A 60-watt light bulb draws 0.5 amperes of current when connected to a 120-volt power so...read more

Cooling chillers are used to remove heat from a liquid via a vapor-compression or absorption refrigeration cycle.

• Cooling chillers are commonly used in industrial settings to cool equipment or machinery.

• They are also used in air conditioning systems to cool buildings or spaces.

• Chillers work by circulating a refrigerant through a compressor, condenser, expansion valve, and evaporator to remove heat from the liquid being cooled.

• Examples of cooling chillers include water-cooled c...read more

A contactor relay is an electrical device used to control a high-power circuit with a low-power signal.

• Contactor relay consists of a coil, contacts, and an enclosure.

• When the coil is energized, it creates a magnetic field that pulls the contacts together to close the circuit.

• Contactor relays are commonly used in motor control circuits to start and stop motors.

• They can also be used in lighting control, heating systems, and other industrial applications.

Termination for control panel involves connecting wires from various components to the terminal blocks inside the panel.

• Identify the components that need to be connected to the control panel

• Strip the insulation off the wires to expose the conductors

• Connect the wires to the appropriate terminal blocks based on the wiring diagram

• Secure the connections with terminal screws or clamps

• Label the wires for easy identification in the future

Terminating a GIS panel involves connecting and securing the cables to the appropriate terminals.

• Identify the cables to be terminated

• Strip the insulation from the cable ends

• Connect the cables to the designated terminals

• Secure the connections with appropriate fasteners

• Test the connections to ensure they are secure and functioning properly

Termination for switch gear involves connecting the wires to the appropriate terminals for proper functioning.

• Identify the terminals for the switch gear

• Strip the insulation from the wires to expose the conductors

• Connect the wires to the corresponding terminals using appropriate connectors

• Ensure proper tightening of the connectors to secure the connection

• Test the connection to ensure it is functioning correctly

Ampere is the unit of electric current, measuring the rate of flow of electric charge.

• Ampere is the SI unit of electric current, symbolized as 'A'.

• It is defined as the flow of one coulomb of charge per second.

• Higher amperage indicates a greater flow of electric current.

• Common household circuits are typically rated at 15-20 amperes.

• Ampere is named after the French physicist Andre-Marie Ampere.

NO NC stands for Normally Open and Normally Closed. They refer to the state of a switch or relay when it is not activated.

• NO (Normally Open) - the switch is open (off) when not activated

• NC (Normally Closed) - the switch is closed (on) when not activated

• Used in electrical circuits to control the flow of current

• Commonly used in control panels, automation systems, and safety circuits

AC motors are classified into different types based on their construction and operation, such as induction motors, synchronous motors, and brushed DC motors.

• Induction motors are the most commonly used type of AC motor and work on the principle of electromagnetic induction.

• Synchronous motors operate at a constant speed determined by the frequency of the AC power supply.

• Brushed DC motors use brushes and a commutator to switch the direction of current flow in the motor windings....read more

Inline functions in C++ are functions that are expanded in place at the point of call rather than being called like regular functions.

• Inline functions are defined with the 'inline' keyword before the function definition.

• They are typically used for small, frequently called functions to reduce the overhead of function calls.

• Inline functions are expanded by the compiler at the point of call, so there is no function call overhead.

• Example: inline int add(int a, int b) { return a +...read more

Single phase voltage refers to the voltage supplied by a single alternating current (AC) source.

• Single phase voltage is commonly used in residential and small commercial applications.

• It is typically 120 or 240 volts in North America and 230 volts in Europe.

• Single phase voltage is characterized by a sinusoidal waveform.

• It is used to power lighting, appliances, and other electrical devices.

• In contrast, three-phase voltage is used for larger industrial and commercial application...read more

VFD stands for Variable Frequency Drive. It is used to control the speed and torque of an electric motor by varying the frequency and voltage of the power supplied to it.

• Controls the speed and torque of an electric motor

• Varies the frequency and voltage of the power supplied to the motor

• Helps in energy savings by adjusting motor speed based on load requirements

• Used in various applications like pumps, fans, conveyors, and compressors

The question asks for circuit diagrams with problems.

• Identify the circuit diagrams provided

• Analyze the diagrams for any potential problems or errors

• Explain the problems and suggest possible solutions

• Provide examples of circuit diagrams with problems

MCCB stands for Molded Case Circuit Breaker. It is a type of circuit breaker that provides protection against overloads and short circuits.

• MCCB is used to protect electrical circuits from overloads and short circuits.

• It can be manually operated to turn off the circuit in case of a fault.

• MCCBs have adjustable trip settings to provide different levels of protection.

• They are commonly used in industrial and commercial applications.

• Example: If there is a sudden surge in current in...read more

The principle of transformer is based on the electromagnetic induction phenomenon.

• Transformers work on the principle of mutual induction between two coils.

• When an alternating current flows through the primary coil, it creates a magnetic field around it.

• This magnetic field induces a voltage in the secondary coil, which is proportional to the number of turns in the coil.

• The voltage in the secondary coil can be stepped up or stepped down depending on the ratio of the number of t...read more

DOL starter is a direct online starter used to start and stop the motor instantly.

• DOL stands for Direct Online.

• It is used to start and stop the motor instantly.

• It is the simplest and cheapest method of starting a motor.

• It consists of a contactor, overload relay, and start and stop push buttons.

• It is used for small motors up to 5 horsepower.

• It is not suitable for large motors as it causes a high starting current.

• Example: A DOL starter is used in a water pump to start and stop ...read more

Types of transformers include power, distribution, isolation, autotransformer. Parts include core, winding, tap changer, bushing.

• Types of transformers: power, distribution, isolation, autotransformer

• Parts of transformer: core, winding, tap changer, bushing

• Power transformer is used for high voltage transmission

• Distribution transformer is used for low voltage distribution

• Isolation transformer is used for safety purposes

• Autotransformer is used for voltage regulation

ZSS stands for Zero Sequence System, PCS stands for Power Control System, and BSS stands for Battery Supervision System.

• ZSS is used to analyze the unbalanced conditions in a power system.

• PCS is used to control the power flow in a system.

• BSS is used to monitor and manage the battery status in a system.

• Examples: ZSS can detect ground faults, PCS can regulate the voltage levels, BSS can provide real-time data on battery health.

MCB stands for Miniature Circuit Breaker.

• MCB is an electrical switch that automatically protects an electrical circuit from damage caused by overload or short circuit.

• It is a type of circuit breaker that is commonly used in residential and commercial buildings.

• MCBs are designed to trip and disconnect the circuit when excessive current flows through it, preventing damage to the electrical equipment and wiring.

• They are compact in size and provide better protection compared to t...read more

RJ45 connectors are used for connecting Ethernet cables to networking devices such as computers, routers, and switches.

• Used for connecting Ethernet cables

• Commonly used in networking devices like computers, routers, and switches

• Has 8 pins for data transmission

• Provides a secure and reliable connection

MPCB stands for Motor Protection Circuit Breaker. It is used to protect motors from overloads, short circuits, and phase failures.

• Protects motors from overloads by tripping the circuit when current exceeds a set limit

• Protects motors from short circuits by quickly disconnecting power

• Protects motors from phase failures by detecting imbalance in current flow

• Helps in preventing damage to the motor and associated equipment

• Commonly used in industrial settings for motor protection

Transformer maintenance involves regular inspection, testing, and servicing to ensure optimal performance and prevent breakdowns.

• Regularly inspecting for signs of wear and tear

• Testing insulation resistance to prevent short circuits

• Servicing cooling systems to prevent overheating

• Checking oil levels and quality for proper lubrication

• Cleaning and tightening connections for efficient operation

Force Motors left due to strategic reasons

• Force Motors decided to exit the electric vehicle segment to focus on their core business of manufacturing commercial vehicles

• The company faced tough competition in the EV market and decided to re-strategize their business model

• Force Motors also faced challenges in terms of high battery costs and lack of charging infrastructure

• The company plans to re-enter the EV market with a new strategy in the future

1 joule is equal to 1 watt-second.

• Joule is a unit of energy while watt is a unit of power.

• 1 joule is the amount of energy transferred when a force of 1 newton is applied over a distance of 1 meter.

• 1 watt is the rate at which energy is transferred or used.

• 1 joule is equal to 1 watt-second or 1 watt is equal to 1 joule per second.

SWG stands for Standard Wire Gauge.

• SWG is a standardized system for measuring the diameter of wire.

• It is commonly used in electrical and electronic industries.

• SWG is also known as British Standard Wire Gauge (BSWG).

The question is asking about the wiring of an AC motor AC panel amplifier.

• AC motors require specific wiring to function properly

• AC panels are used to control and distribute power to the motor

• An amplifier may be used to boost the signal or power of the motor

• Proper wiring is essential for the safe and efficient operation of the motor

The amount per month can vary depending on factors such as experience, location, and company.

• Amount per month can range from $2,000 to $5,000 for entry-level ITI Electricians.

• Experienced ITI Electricians can earn upwards of $6,000 per month.

• Salaries may also vary based on the location and the company you work for.

• Additional benefits such as health insurance, retirement plans, and bonuses may also impact the total amount per month.

Galvanization is the process of applying a protective zinc coating to steel or iron to prevent rusting.

• Galvanization involves immersing the metal in a bath of molten zinc or using an electroplating process.

• The zinc coating acts as a sacrificial anode, protecting the underlying metal from corrosion.

• Common examples of galvanized items include galvanized steel pipes, fences, and roofing materials.

Power factor is the ratio of real power to apparent power in an electrical system.

• Power factor is a measure of how effectively electrical power is being used in a system.

• It is calculated by dividing the real power (in watts) by the apparent power (in volt-amperes).

• A power factor of 1 indicates all the power is being used effectively, while a power factor less than 1 indicates inefficiency.

• Improving power factor can reduce energy costs and increase system capacity.

• For example,...read more

A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.

• Consists of two or more coils of insulated wire wound around a core

• Primary coil receives electrical energy and induces a magnetic field in the core

• Secondary coil receives the magnetic field and converts it back to electrical energy

• Used to step up or step down voltage levels in electrical systems

• Examples include power distribution transformers a...read more

Ohm's law states that the current flowing through a conductor is directly proportional to the voltage applied across it, and inversely proportional to the resistance of the conductor.

• Ohm's law is represented by the formula V = I * R, where V is voltage, I is current, and R is resistance.

• It helps in calculating the current, voltage, or resistance in a circuit when the other two values are known.

• For example, if a circuit has a voltage of 12V and a resistance of 4 ohms, the curr...read more

A function generator is a type of electronic test equipment that generates various types of electrical waveforms.

• Function generators can produce sine, square, triangle, and sawtooth waveforms.

• They are commonly used in testing and troubleshooting electronic circuits.

• Function generators can also be used for frequency modulation and amplitude modulation.

• Examples of function generator brands include Tektronix, Keysight, and Rigol.

A pump motor is a type of electric motor specifically designed to power pumps for various applications.

• Pump motors are used to drive pumps that are used in industries, agriculture, water supply systems, etc.

• They are designed to provide the necessary power and torque to move fluids through the pump.

• Pump motors can be of different types such as centrifugal pump motors, submersible pump motors, etc.

Transporters should be handled with care and proper communication.

• Maintain clear communication with the transporter regarding pickup and delivery schedules.

• Ensure that the transporter is aware of any special handling instructions for the materials being transported.

• Inspect the condition of the materials upon delivery to ensure they have been handled properly.

• Provide feedback to the transporter on their performance to improve future interactions.

• Address any issues or concerns ...read more

Handle distributors by maintaining good communication, providing support, and resolving issues promptly.

• Maintain regular communication with the distributor to understand their needs and concerns

• Provide necessary support such as training, marketing materials, and product information

• Address any issues or complaints from the distributor promptly and professionally

• Work together with the distributor to develop strategies for increasing sales and improving customer satisfaction

• Regu...read more

I have experience with VFD work and control wiring in various industrial settings.

• I have installed and programmed Variable Frequency Drives (VFDs) for motor control.

• I am familiar with wiring diagrams and troubleshooting control circuits.

• I have worked on projects involving VFDs for speed control and energy efficiency.

• I have experience with setting up communication protocols for VFDs, such as Modbus or Profibus.

Earthing points are checked by using a multimeter to measure the resistance between the earthing point and the earth electrode.

• Use a multimeter set to the resistance mode

• Connect one probe to the earthing point and the other probe to the earth electrode

• Check the resistance reading on the multimeter

• A low resistance reading indicates a good earthing connection

• Repeat the process for all earthing points in the system

LT stands for Low Tension and HT stands for High Tension in the context of electrical systems.

• LT refers to voltage levels below 1000V, while HT refers to voltage levels above 1000V.

• LT is commonly used for household appliances and lighting, while HT is used for industrial equipment and power distribution.

• LT systems are generally safer and easier to work with compared to HT systems.

• Examples of LT equipment include ceiling fans, refrigerators, and light bulbs, while examples of ...read more

AC and DC are two types of electrical current with different characteristics.

• AC stands for alternating current and changes direction periodically, while DC stands for direct current and flows in one direction.

• AC is used for power transmission over long distances, while DC is used for electronic devices and batteries.

• AC voltage can be easily changed using a transformer, while DC voltage cannot be changed as easily.

• AC is more dangerous to humans than DC due to its ability to ca...read more

Wiring and boards are essential components of electrical systems.

• Wiring refers to the physical connections between electrical components.

• Boards are used to organize and control the flow of electricity.

• Proper wiring and board design are crucial for safety and efficiency.

• Examples of boards include circuit breaker panels and control boards for industrial machinery.

The change from BS 4 to BS 6 involves stricter emission norms for vehicles in order to reduce pollution.

• BS 6 emission norms are more stringent compared to BS 4

• BS 6 compliant vehicles have lower emissions of harmful pollutants such as nitrogen oxides and particulate matter

• BS 6 fuel has lower sulfur content compared to BS 4 fuel

• The implementation of BS 6 norms aims to improve air quality and reduce environmental impact

Motor principle is the concept that a current-carrying conductor in a magnetic field experiences a force, leading to rotation in an electric motor.

• Motor principle states that when a current-carrying conductor is placed in a magnetic field, it experiences a force.

• This force causes the conductor to rotate, which is the basic principle behind the operation of electric motors.

• The direction of the force is determined by Fleming's left-hand rule.

• Electric motors convert electrical e...read more

A thermocouple is a temperature sensor consisting of two different metals joined together at one end.

• Consists of two different metals joined together at one end

• Generates a voltage proportional to the temperature difference between the two ends

• Commonly used in industrial applications for temperature measurement

• Examples: Type K, Type J thermocouples

Transformer principle is based on the phenomenon of electromagnetic induction, where changing current in one coil induces a voltage in another coil.

• Transformers work on the principle of electromagnetic induction.

• They consist of two coils, primary and secondary, wound around a core.

• When an alternating current flows through the primary coil, it creates a changing magnetic field.

• This changing magnetic field induces a voltage in the secondary coil.

• The ratio of turns in the primar...read more

To change motor rotation, swap any two of the three power supply wires.

• Swap any two of the three power supply wires to change motor rotation.

• Ensure power is disconnected before making any changes.

• Consult the motor's manual for specific instructions.

• Test the motor after making the changes to ensure it is rotating in the desired direction.