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10+ Jindal Steel and Power Electrical Maintenance Technician Interview Questions and Answers

Updated 6 Feb 2024

Q1. What is reverse forward draw the control wirring

Ans.

Reverse forward draw is a control wiring method used in electrical systems to control the direction of rotation of a motor.

  • Reverse forward draw is used to control the direction of rotation of a motor.

  • It involves the use of a forward contactor and a reverse contactor.

  • The control wiring includes connections between the contactors, motor, and power supply.

  • By energizing the forward contactor, the motor rotates in one direction, and by energizing the reverse contactor, the motor r...read more

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Q2. What is different between ac and dc motor

Ans.

AC motors and DC motors differ in their power source, construction, speed control, and applications.

  • AC motors run on alternating current, while DC motors run on direct current.

  • AC motors are more commonly used in household appliances, industrial machinery, and electric vehicles.

  • DC motors are often found in battery-powered devices, such as laptops, electric cars, and robots.

  • AC motors have a simpler construction with fewer parts, while DC motors have a more complex design.

  • AC mot...read more

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Q3. What is relay what do work

Ans.

A relay is an electrical device that acts as a switch to control the flow of current in an electrical circuit.

  • Relays are used to control high-power devices with low-power signals.

  • They consist of an electromagnet and a set of contacts.

  • When the electromagnet is energized, it creates a magnetic field that attracts or releases the contacts, allowing or interrupting the flow of current.

  • Relays are commonly used in industrial automation, automotive systems, and control circuits.

  • For ...read more

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Q4. What is timer what do work

Ans.

A timer is a device that measures and controls the passage of time.

  • A timer is used to initiate or stop a process at a specific time or after a specific duration.

  • Timers can be mechanical or electronic.

  • They are commonly used in various applications such as appliances, industrial machinery, and automation systems.

  • Examples of timers include kitchen timers, programmable thermostats, and countdown timers in sports events.

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Q5. What is PLC what do work

Ans.

PLC stands for Programmable Logic Controller. It is a digital computer used for automation of electromechanical processes.

  • PLC is a specialized computer designed to control industrial processes.

  • It uses a programmable memory to store instructions and execute them in a sequential manner.

  • PLCs are commonly used in manufacturing plants, power stations, and other industrial settings.

  • They can be programmed to control various devices such as motors, valves, sensors, and switches.

  • PLCs ...read more

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Q6. What is ac motor

Ans.

An AC motor is a type of electric motor that operates on alternating current.

  • AC motor stands for Alternating Current motor.

  • It converts electrical energy into mechanical energy.

  • AC motors are commonly used in household appliances, industrial machinery, and vehicles.

  • They are more efficient and require less maintenance compared to DC motors.

  • Examples of AC motors include induction motors, synchronous motors, and brushless motors.

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Q7. What is rectifier

Ans.

A rectifier is an electrical device that converts alternating current (AC) to direct current (DC).

  • Rectifiers are commonly used in power supplies to convert AC voltage to DC voltage.

  • They are made up of diodes, which allow current to flow in only one direction.

  • Rectifiers can be half-wave or full-wave, depending on the number of diodes used.

  • Examples of rectifiers include bridge rectifiers, vacuum tube rectifiers, and solid-state rectifiers.

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Ans.

A diode is an electronic component that allows current to flow in one direction and blocks it in the opposite direction.

  • Diodes are commonly used in rectifier circuits to convert AC to DC.

  • They have two terminals: an anode (positive) and a cathode (negative).

  • When the voltage across a diode is forward-biased, it allows current to flow.

  • When the voltage is reverse-biased, it blocks the current.

  • Diodes are often used for voltage regulation, signal demodulation, and protection agains...read more

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Q9. What is plc working

Ans.

PLC stands for Programmable Logic Controller. It is a digital computer used for automation of electromechanical processes.

  • PLC is used to control and monitor industrial processes.

  • It is programmed using ladder logic or other programming languages.

  • PLCs are commonly used in manufacturing, power plants, and transportation systems.

  • They can be used to control motors, valves, sensors, and other devices.

  • PLCs provide real-time monitoring and control of processes, improving efficiency a...read more

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Ans.

A timer is a device or software that measures and controls the passage of time.

  • A timer can be a physical device with buttons and a display, or it can be a software program on a computer or smartphone.

  • Timers are commonly used in various applications such as cooking, sports, and industrial processes.

  • They can be set to count down from a specific time or count up from zero.

  • Some timers have additional features like alarms, multiple time settings, and programmable intervals.

  • Example...read more

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Ans.

MCB stands for Miniature Circuit Breaker.

  • MCB is an electrical switch that automatically interrupts the flow of current in an electrical circuit during an overload or short circuit.

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

  • MCBs are designed to protect electrical circuits and appliances from damage caused by excessive current.

  • They are compact in size and can be easily installed in electrical distribution boards.

  • MCBs have a tri...read more

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Ans.

VFD stands for Variable Frequency Drive.

  • VFD is an electronic device used to control the speed and torque of an electric motor.

  • It adjusts the frequency and voltage supplied to the motor, allowing for precise control of motor speed.

  • VFDs are commonly used in industrial applications to save energy, improve motor performance, and enable soft starting and stopping.

  • They are also known as AC drives, adjustable speed drives, or inverters.

  • Example: A VFD can be used in a manufacturing p...read more

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