10+ ITI Electrician, Electrical Maintenance Interview Questions and Answers

Power factor is a measure of how efficiently electrical power is being used. It can be improved by using power factor correction techniques. ACB and VCB are types of circuit breakers used in electrical systems.

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

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

• Power factor can be improved by using power factor corre...read more

The most commonly used wiring in home or domestic wiring is PVC insulated copper wires.

• PVC insulated copper wires are used for lighting and power circuits.

• Flat PVC insulated cables are used for submersible pumps.

• Armoured cables are used for outdoor wiring.

• Flexible cords are used for appliances and equipment.

• Wires with different colors are used for easy identification of circuits.

The A/C volt India frequency is 50 Hz.

• The A/C volt India frequency is standardized at 50 Hz.

• This frequency is used for alternating current (A/C) power supply in India.

• It is important for electricians to be aware of this frequency when working with electrical systems.

• For comparison, some other countries use a frequency of 60 Hz for A/C power supply.

Increasing the capacity of an electric car can be achieved by upgrading the battery technology and improving the charging infrastructure.

• Upgrade the battery technology to increase energy storage capacity

• Improve the charging infrastructure to support faster charging

• Enhance the efficiency of the electric motor and power electronics

• Optimize the vehicle's weight and aerodynamics to reduce energy consumption

• Implement regenerative braking to recover and store energy

• Develop advanced...read more

A/C current can be converted to 24 volt DC using a rectifier and a voltage regulator.

• Use a rectifier to convert A/C current to pulsating DC current

• Filter the pulsating DC current using a capacitor

• Use a voltage regulator to regulate the voltage to 24 volts DC

• Examples of rectifiers include diodes and bridge rectifiers

A DOL starter is a direct online motor starter that is used to start and stop motors without any speed control.

• DOL starter consists of a contactor, overload relay, start and stop push buttons, and power circuit

• The contactor connects the motor to the power supply when the start button is pressed

• The overload relay protects the motor from overloading and overheating

• The stop button breaks the circuit and stops the motor

• Example: DOL starter is commonly used in industries for start...read more

To check a motor in megar, use a megohmmeter to measure the insulation resistance.

• Disconnect the motor from the power source.

• Remove the motor leads from the ground.

• Connect the megohmmeter to the motor leads and ground.

• Measure the insulation resistance.

• Compare the reading to the manufacturer's specifications.

I have 5 years of experience in electrical maintenance and troubleshooting.

• I have worked on various electrical systems including motors, generators, and transformers.

• I am skilled in reading and interpreting electrical schematics and blueprints.

• I have experience in conducting preventative maintenance and identifying potential issues before they become major problems.

• I am familiar with electrical safety protocols and have a strong track record of adhering to them.

• I have also tr...read more

A work proximity sensor is a device that detects the presence of objects or people within a certain distance of the sensor.

• It is commonly used in industrial settings to ensure worker safety around heavy machinery.

• The sensor emits a field of electromagnetic radiation and detects changes in the field caused by the presence of an object or person.

• It can be used to trigger alarms or shut down machinery if someone or something gets too close.

• There are different types of proximity ...read more

An ignitor is used in sodium lamps to start and maintain the discharge of sodium vapor.

• Sodium lamps require a high voltage to start the discharge of sodium vapor.

• The ignitor provides a high voltage pulse to start the discharge.

• Once the discharge is started, the ignitor is no longer needed.

• The ignitor also helps to maintain the discharge by providing a small current to keep the lamp lit.

• Without an ignitor, the lamp would not start or would flicker and fail to maintain a steady...read more

A DOL starter circuit diagram is a simple electrical setup used to start and stop motors.

• DOL stands for Direct-On-Line starter

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

• The circuit diagram shows the connections between these components

• The main power supply is connected to the contactor, which controls the motor's power supply

• The overload relay protects the motor from overheating

• The start/stop push buttons control the on/off function of the motor

Electrical maintenance for LT cable work involves inspecting, testing, and repairing low voltage cables to ensure proper functioning.

• Inspecting LT cables for any signs of damage or wear

• Testing the cables for continuity and insulation resistance

• Repairing or replacing damaged cables as needed

• Ensuring proper cable routing and connections for efficient power transmission

Transformers work on the principle of electromagnetic induction.

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

• The primary coil induces a magnetic field which in turn induces a voltage in the secondary coil.

• Transformers are used to step up or step down voltage levels in electrical systems.

• Examples of transformers include power transformers, distribution transformers, and instrument transformers.

A star delta starter is a type of motor starter used to reduce the starting current of a motor.

• It is commonly used in applications where the motor requires a high starting current.

• The star delta starter initially connects the motor in a star configuration, which reduces the voltage across each winding and hence the current.

• After a certain time, the starter switches the motor to a delta configuration, allowing it to run at full voltage and current.

• This transition from star to ...read more

A VFD has basic parameters like input voltage, output voltage, frequency, current, power, and speed control.

• Input voltage: the voltage supplied to the VFD

• Output voltage: the voltage produced by the VFD

• Frequency: the frequency of the output voltage

• Current: the current supplied to the motor

• Power: the power supplied to the motor

• Speed control: the ability to control the speed of the motor