100+ ITI Electrician Interview Questions and Answers

A unit is a standard measurement used to quantify physical quantities. Current is measured in amperes (A) and voltage is measured in volts (V).

• A unit is a fixed quantity used as a standard of measurement.

• Current is the flow of electric charge in a circuit and is measured in amperes (A).

• Voltage is the electric potential difference between two points in a circuit and is measured in volts (V).

• The unit of current, ampere, is named after the French physicist André-Marie Ampère.

• The...read more

Explaining control diagrams for Star Delta, Revers Forward, and DOL starters.

• Star Delta starter is used for high voltage motors and reduces starting current

• Revers Forward starter is used for reversible motors and changes direction of rotation

• DOL starter is used for small motors and provides direct power to the motor

• Control diagrams show the connections between the starter and motor

• These diagrams help in troubleshooting and maintenance of the electrical system

There are several types of transformers used in electrical systems.

• Power Transformers

• Distribution Transformers

• Instrument Transformers

• Auto Transformers

• Isolation Transformers

• Step-up and Step-down Transformers

• Three-phase Transformers

• Single-phase Transformers

MCB stands for Miniature Circuit Breaker. It is a type of electrical switch that automatically shuts off the electrical circuit during an overload or short circuit.

• Types of MCB include Single Pole MCB, Double Pole MCB, Triple Pole MCB, and Four Pole MCB.

• Other types of electrical instruments include Voltmeter, Ammeter, Multimeter, Oscilloscope, and Earth Tester.

• Types of electrical panels commonly used are Distribution Panels, Control Panels, and Motor Control Centers.

A transformer is an electrical device that changes the voltage and current levels while maintaining the frequency, commonly used for stepping up or stepping down voltage.

• Transformers consist of primary and secondary coils wound around a core made of ferromagnetic material.

• They work on the principle of electromagnetic induction, where changing current in the primary coil induces a voltage in the secondary coil.

• Step-up transformers increase voltage levels for long-distance powe...read more

Working in an oil unit requires knowledge of electrical systems, safety protocols, and equipment maintenance.

• Understand the electrical systems used in oil units

• Follow safety protocols to prevent accidents and injuries

• Perform regular maintenance on equipment to ensure proper functioning

• Be aware of potential hazards such as flammable materials and high-pressure systems

• Communicate effectively with other workers to coordinate tasks and ensure safety

• Be prepared to work in challeng...read more

Mcb stands for Miniature Circuit Breaker and MCCB stands for Molded Case Circuit Breaker.

• Mcb is a type of circuit breaker that is used for low voltage applications.

• MCCB is a type of circuit breaker that is used for high voltage applications.

• Both Mcb and MCCB are used to protect electrical circuits from overloads and short circuits.

• Mcb is usually rated for currents up to 100 amps, while MCCB can handle currents up to 2500 amps.

• Examples of applications for Mcb include residenti...read more

A transformer works on the principle of mutual induction between two windings linked by a common magnetic flux.

• Transformers consist of two inductive coils - primary and secondary windings.

• When an alternating current flows through the primary winding, it creates a changing magnetic field which induces a voltage in the secondary winding.

• The ratio of the number of turns in the primary winding to the number of turns in the secondary winding determines the voltage transformation r...read more

A motor is an electrical device that converts electrical energy into mechanical energy.

• Converts electrical energy to mechanical energy

• Used in various applications such as industrial machinery, appliances, vehicles, etc.

• Types include AC motors, DC motors, servo motors, etc.

• Common examples include electric fans, washing machines, electric vehicles, etc.

The speed of a turbine is controlled by adjusting the flow of steam or water.

• The speed of a turbine can be controlled by adjusting the flow rate of the working fluid, such as steam or water.

• By increasing or decreasing the flow rate, the turbine's speed can be increased or decreased accordingly.

• This control mechanism allows for efficient operation and optimization of power generation systems.

• For example, in a steam turbine, the speed can be controlled by adjusting the steam fl...read more

The number of windings used in an auto transformer can vary depending on the specific application.

• Auto transformers can have a single winding or multiple windings.

• In a single winding auto transformer, the primary and secondary windings are connected together.

• In a multiple winding auto transformer, there are separate primary and secondary windings.

• The number of windings determines the voltage transformation ratio of the auto transformer.

• For example, a step-down auto transforme...read more

PLC panel is operated by programming the logic controller to control the electrical components.

• Understand the logic of the system and program the PLC accordingly

• Connect the input and output devices to the PLC panel

• Test the system to ensure proper functioning

• Regular maintenance and troubleshooting of the panel

• Examples of PLC panels include conveyor systems, assembly lines, and HVAC systems

In side panel dressings and termination

• Side panel dressings refer to the coverings or enclosures on the sides of electrical panels.

• Termination refers to the process of connecting electrical wires or cables to the appropriate terminals or connectors.

• Proper side panel dressings and termination are essential for safety and to ensure efficient electrical connections.

• Examples of side panel dressings include metal or plastic covers, doors, or panels that protect the internal compon...read more

There are several types of light lamps used in various applications.

• Incandescent lamps

• Fluorescent lamps

• LED lamps

• Halogen lamps

• High-intensity discharge lamps

• Compact fluorescent lamps

• CFL lamps

• Neon lamps

• Mercury vapor lamps

• Sodium vapor lamps

• Metal halide lamps

• Ultraviolet lamps

• Infrared lamps

There are various types of cable glandings used in electrical installations.

• Cable glandings are used to secure and terminate cables in electrical installations.

• Types of cable glandings include armored cable glandings, unarmored cable glandings, and explosion-proof cable glandings.

• Armored cable glandings are used for cables that have steel wire armor or steel tape armor.

• Unarmored cable glandings are used for cables that do not have any armor.

• Explosion-proof cable glandings are...read more

Yes, I know how to run a chiller machine.

• I have experience in operating and maintaining chiller machines.

• I am familiar with the different components and controls of a chiller machine.

• I can troubleshoot and diagnose issues with chiller machines.

• I am trained in following safety protocols while working with chiller machines.

D.OL starter is a type of motor starter used to start and stop three-phase motors.

• D.OL stands for Direct-On-Line.

• It is the simplest and most common type of motor starter.

• It directly connects the motor to the power supply, providing full voltage to the motor.

• It is suitable for small to medium-sized motors.

• It does not provide any protection against overloading or short circuits.

• It is commonly used in applications such as pumps, fans, and conveyors.

Different types of motors include DC motors, AC motors, synchronous motors, asynchronous motors, etc.

• DC motors operate on direct current and are commonly used in appliances and vehicles.

• AC motors operate on alternating current and are used in industrial applications.

• Synchronous motors maintain a constant speed and are used in applications requiring precision.

• Asynchronous motors vary in speed and are commonly used in household appliances.

• Other types include stepper motors, ser...read more

Power formula is P = VI or P = I²R or P = V²/R, where P is power in watts, V is voltage in volts, and I is current in amperes.

• Power formula is used to calculate the power consumed by an electrical circuit.

• The formula can be expressed as P = VI or P = I²R or P = V²/R.

• P is power in watts, V is voltage in volts, and I is current in amperes.

• For example, if a circuit has a voltage of 120V and a current of 5A, the power consumed would be 600W.

• The power formula is essential for calc...read more

Yes, I can do maintenance HVAC work.

• I have experience in maintaining and troubleshooting HVAC systems.

• I am familiar with the various components of HVAC systems such as air handlers, compressors, and thermostats.

• I can perform tasks like cleaning filters, checking refrigerant levels, and inspecting electrical connections.

• I have successfully completed HVAC maintenance projects in my previous roles.

• I stay updated with the latest industry standards and regulations related to HVAC ...read more

The power connection process for a star-delta control system involves connecting the motor windings in a specific sequence to reduce starting current.

• Connect the motor windings in a star configuration for starting.

• Switch to a delta configuration once the motor reaches a certain speed.

• This helps reduce the starting current and provides a smooth transition for the motor.

• Ensure proper wiring and connections to avoid any electrical issues.

• Consult the wiring diagram provided by th...read more

To install a transmitter, follow these steps

• Choose a suitable location for the transmitter

• Mount the transmitter securely

• Connect the power supply to the transmitter

• Connect the transmitter to the device it will be transmitting to

• Configure the transmitter settings as required

There are three main types of motors: AC motors, DC motors, and universal motors.

• AC motors run on alternating current and are commonly used in household appliances.

• DC motors run on direct current and are often found in battery-operated devices.

• Universal motors can run on both AC and DC power sources, making them versatile for various applications.

Calculate RPM using frequency and pole count; amperage using power and voltage in a three-phase motor.

• RPM (Revolutions Per Minute) can be calculated using the formula: RPM = (120 × Frequency) / Number of Poles.

• For example, a 4-pole motor running at 60 Hz: RPM = (120 × 60) / 4 = 1800 RPM.

• Amperage can be calculated using the formula: Amperage = Power (Watts) / (Voltage × √3).

• For example, for a 10 kW motor at 400V: Amperage = 10000 / (400 × √3) ≈ 14.43 A.

A potential transformer is a type of instrument transformer used to measure voltage in high voltage systems.

• It is also known as a voltage transformer.

• It steps down the voltage to a lower level suitable for measurement or protection.

• Potential transformers are commonly used in power systems for metering, relaying, and control purposes.

• They provide accurate voltage measurements and isolate the measuring instruments from high voltage circuits.

• For example, in a power distribution ...read more

Yes, I am capable of processing both single phase and three phase work on electric sites.

• I am experienced in working with both single phase and three phase electrical systems.

• I can install, maintain, and troubleshoot single phase and three phase electrical equipment.

• I am familiar with the wiring diagrams and connections for both single phase and three phase systems.

• I have successfully completed projects involving both single phase and three phase electrical work.

An ampere (amp) is the unit of electric current in the International System of Units (SI).

• Amperes measure the rate of flow of electric charge.

• It is named after the French physicist André-Marie Ampère.

• One ampere is defined as one coulomb of charge passing through a point in one second.

• Amperes are used to measure the current flowing through electrical circuits.

• Common household appliances like light bulbs and refrigerators typically draw currents in the range of a few amperes.

Current is the flow of electric charge. 3 phase voltage refers to the voltage in a three-phase power supply system.

• Current is measured in amperes (A)

• 3 phase voltage is typically 208V, 240V, 480V, or 600V

• In a three-phase system, there are three voltage sources that are 120 degrees out of phase with each other

• The voltage between any two phases is called line voltage, while the voltage between any phase and neutral is called phase voltage

Yes, I know electrician work well.

• I have a strong understanding of electrical systems and wiring.

• I am familiar with electrical codes and safety procedures.

• I have experience in troubleshooting and repairing electrical issues.

• I can read and interpret electrical blueprints and diagrams.

• I am skilled in installing and maintaining electrical equipment and fixtures.

• I have knowledge of different types of electrical systems and their components.

• I am proficient in using electrical tool...read more

AC and DC currents differ in terms of direction, voltage, and usage.

• AC (alternating current) periodically changes direction, while DC (direct current) flows in one direction.

• AC voltage changes over time, while DC voltage remains constant.

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

• Examples of AC sources include power grids and generators, while examples of DC sources include batteries and solar panels.

Motor resistance values can be checked using a multimeter.

• Disconnect the motor from the power source.

• Set the multimeter to the resistance measurement mode.

• Connect the multimeter leads to the motor terminals.

• Read the resistance value displayed on the multimeter.

• Compare the measured value with the manufacturer's specifications.

• Repeat the process for all phases of the motor.

The principal of a transformer is based on the principle of electromagnetic induction.

• Transformers work on the principle of Faraday's law of electromagnetic induction.

• 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, resulting in the transfer of electrical energy.

• The ratio of the number of turns in the primary coil to the number of turns in the secondary coil d...read more

ACB and VCB breakers are electrical devices used for circuit protection.

• ACB stands for Air Circuit Breaker and VCB stands for Vacuum Circuit Breaker.

• ACBs use air as the medium to extinguish the arc while VCBs use vacuum.

• Both breakers are used for circuit protection and can be found in power distribution systems.

• ACBs and VCBs have similar parts including contacts, arc chutes, trip units, and operating mechanisms.

CEBAL is not a term commonly used in the electrical field. Please provide more context or clarification.

The color code of a 410 k ohm resistance is yellow, brown, black, and red.

• 410 k ohm is represented by yellow, brown, black, and red bands on a resistor

• Yellow represents 4, Brown represents 1, Black represents 0, and Red represents 2 zeros (x100)

• So the color code for 410 k ohm resistance is yellow, brown, black, red

I am proficient in programming languages such as C, C++, Java, and Python.

• C

• C++

• Java

• Python

The kW required for a 2 hp motor depends on the efficiency of the motor.

• The efficiency of the motor needs to be known to calculate the kW required.

• The formula to calculate kW is kW = hp x 0.746 / efficiency.

• Assuming an efficiency of 80%, the kW required for a 2 hp motor would be 1.49 kW.

A diesel generator (DG) is a type of generator that uses a diesel engine to generate electricity.

• DGs are commonly used as backup power sources in case of power outages.

• They are also used in remote locations where grid power is not available.

• DGs are available in various sizes and capacities to suit different power requirements.

• Regular maintenance and fuel supply are essential for the proper functioning of a DG.

• Examples of DG brands include Cummins, Caterpillar, and Kohler.

Single phase has one live wire and one neutral wire, while three phase has three live wires and one neutral wire.

• Single phase is used for smaller loads like household appliances.

• Three phase is used for larger loads like industrial machinery.

• Single phase has a lower power output compared to three phase.

• Three phase is more efficient and cost-effective for high power applications.

• Single phase has a voltage of 230V while three phase has a voltage of 400V.

• Single phase motors are s...read more

There are mainly two types of motors - AC motors and DC motors.

• AC motors: Induction motors, synchronous motors

• DC motors: Brushed DC motors, brushless DC motors

• Other types: Servo motors, stepper motors

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.

The part in AC motor is called a rotor.

• The rotor is the rotating part of the motor that converts electrical energy into mechanical energy.

• It is made up of a cylindrical core with conductive windings and is mounted on a shaft.

• The rotor rotates inside the stator, which is the stationary part of the motor.

• The rotor is also known as the armature in some types of AC motors.

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

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

Rewinding a 72 slot 50 hp motor involves disassembling the motor, removing the old windings, and replacing them with new windings.

• Disassemble the motor carefully to access the windings

• Remove the old windings without damaging the core

• Calculate the number of turns and wire gauge needed for the new windings

• Wind the new coils carefully and evenly in the slots

• Connect the windings properly and test the motor for functionality

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

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