200+ 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

AC and DC are two types of electrical current. There are several types of switches used in electrical circuits.

• AC stands for Alternating Current and DC stands for Direct Current.

• AC current changes direction periodically while DC current flows in one direction only.

• Types of switches include toggle switches, rocker switches, push-button switches, and rotary switches.

• Switches can be classified based on their function, such as on/off switches, selector switches, and momentary swi...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

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

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

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 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

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

Connecting a 5kW motor requires proper wiring, safety measures, and understanding of electrical components.

• Use appropriate wire gauge: For a 5kW motor, typically use at least 2.5mm² copper wire.

• Ensure proper voltage supply: Check if the motor operates on 230V or 400V.

• Install a motor starter: Use a contactor and overload relay to protect the motor.

• Connect the motor to a suitable power source: Ensure the circuit can handle the motor's load.

• Implement safety measures: Use fuses o...read more

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 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

Transformers work on the principle of electromagnetic induction to transfer electrical energy between circuits.

• Transformers operate based on Faraday's Law of Electromagnetic Induction.

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

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

• This magnetic field induces a voltage in the secondary coil, allowing energy transfer.

• Example: Step-up transformers increase voltage for l...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

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.

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

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.

Working in a control room involves monitoring systems, managing operations, and ensuring safety protocols are followed.

• Monitor equipment and systems using control panels and screens.

• Communicate with team members to coordinate responses to issues.

• Analyze data and reports to identify trends or problems.

• Implement safety protocols and emergency procedures when necessary.

• Maintain logs of operations and incidents for future reference.