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Jindal Steel and Power

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10+ i-exceed technology solutions Interview Questions and Answers

Updated 30 Mar 2024
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Q1. What is different between MCB and DOL starter ?

Ans.

MCB and DOL starter are both electrical devices used for protection and control, but they have different functions and applications.

  • MCB stands for Miniature Circuit Breaker and is used for circuit protection against overcurrents and short circuits.

  • DOL starter stands for Direct-On-Line starter and is used for starting and stopping motors.

  • MCB is a switch that automatically trips and disconnects the circuit when an overcurrent or short circuit occurs.

  • DOL starter is a control dev...read more

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Q2. Which is more dangerous-shock due to AC or DC?

Ans.

AC and DC shocks can both be dangerous, but AC shocks are generally considered more dangerous.

  • AC shocks can cause muscle contractions, making it difficult to let go of the source of the shock.

  • AC shocks can also cause ventricular fibrillation, a potentially fatal condition where the heart's rhythm becomes irregular.

  • DC shocks are more likely to cause burns and tissue damage at the point of contact.

  • However, the severity of a shock depends on various factors such as current, dura...read more

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Q3. How many distance between core and armature in ht motor

Ans.

The distance between the core and armature in an HT motor varies depending on the specific motor design.

  • The distance between the core and armature is determined by the motor manufacturer and can vary based on factors such as motor size, voltage rating, and application.

  • In general, the core and armature are designed to be close enough to ensure efficient magnetic coupling but far enough to prevent physical contact and friction.

  • The specific distance between the core and armature...read more

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Q4. What is the unit of resistance ?

Ans.

The unit of resistance is ohm (Ω).

  • The unit of resistance is named after the German physicist Georg Simon Ohm.

  • Resistance is a measure of how much a material or device opposes the flow of electric current.

  • The symbol for ohm is the Greek letter omega (Ω).

  • Resistance can be calculated using Ohm's Law: R = V/I, where R is resistance, V is voltage, and I is current.

  • Common examples of resistance include resistors, light bulbs, and heating elements.

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Q5. What are the sources of electricity ?

Ans.

The sources of electricity include fossil fuels, nuclear power, renewable energy sources, and batteries.

  • Fossil fuels such as coal, oil, and natural gas are commonly used to generate electricity in power plants.

  • Nuclear power plants use nuclear reactions to produce electricity.

  • Renewable energy sources like solar power, wind power, hydroelectric power, and geothermal power can generate electricity.

  • Batteries can store and provide electricity for various applications.

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Q6. What is electrical motor ?

Ans.

An electrical motor is a device that converts electrical energy into mechanical energy to perform work.

  • Electrical motors are used in various applications such as industrial machinery, household appliances, and vehicles.

  • They work on the principle of electromagnetic induction, where a current-carrying conductor experiences a force in the presence of a magnetic field.

  • There are different types of electrical motors, including AC motors, DC motors, synchronous motors, and induction...read more

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Q7. Make a DOL starter circuit diagram?

Ans.

A DOL starter circuit diagram is used to control the starting and stopping of an electric motor.

  • DOL stands for Direct-On-Line.

  • The circuit consists of a contactor, overload relay, and start and stop buttons.

  • When the start button is pressed, the contactor closes and power is supplied directly to the motor.

  • The overload relay protects the motor from excessive current.

  • The stop button opens the contactor and stops the motor.

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Q8. Where are semiconductors used ?

Ans.

Semiconductors are used in various electronic devices and systems.

  • Semiconductors are used in computers and other digital devices for processing and memory.

  • They are used in telecommunication systems for signal amplification and transmission.

  • Semiconductors are used in power electronics for controlling and converting electrical energy.

  • They are used in lighting systems such as LEDs and OLEDs.

  • Semiconductors are used in sensors and detectors for various applications.

  • They are used i...read more

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Q9. What are insulators ?

Ans.

Insulators are materials that do not conduct electricity.

  • Insulators are substances that prevent the flow of electric current.

  • They have high resistance to the flow of electrons.

  • Insulators are used to protect against electric shocks and to prevent short circuits.

  • Examples of insulators include rubber, plastic, glass, and ceramic.

  • Insulators are commonly used in electrical wiring, circuit boards, and electrical equipment.

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Q10. What is power factor?

Ans.

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

  • Power factor is the ratio of real power (in watts) to apparent power (in volt-amperes).

  • It indicates the efficiency of electrical power consumption in a circuit.

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

  • Inductive loads like motors and transformers have a lagging power factor, while capacitive loads have a ...read more

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Q11. What is resistance ?

Ans.

Resistance is the measure of opposition to the flow of electric current in a material.

  • Resistance is measured in ohms (Ω).

  • It is caused by the collisions of electrons with atoms and other electrons in the material.

  • Resistance can be influenced by factors such as temperature, length, and cross-sectional area of the material.

  • Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage applied and inversely proportional to the resistance.

  • For...read more

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Q12. What is cable and conductor

Ans.

Cable is a bundle of insulated conductors used for transmitting electrical power or signals.

  • Cable is made up of multiple conductors that are insulated and bundled together.

  • Conductors are materials that allow the flow of electric current.

  • Cables are used for various applications such as power transmission, telecommunications, and data transfer.

  • Examples of cables include electrical power cables, Ethernet cables, and coaxial cables.

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Q13. What is meger define it

Ans.

Meger is a term used in electrical engineering to refer to the process of combining two or more electrical circuits or systems.

  • Meger involves connecting the circuits or systems together to create a single, unified system.

  • It is commonly used when expanding or upgrading electrical systems.

  • Meger can be done by connecting the positive terminals of the circuits together and the negative terminals together.

  • For example, when adding a new room to a house, the electrical circuits of t...read more

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Q14. What is earthing and grounding

Ans.

Earthing and grounding are electrical safety measures that involve connecting electrical systems to the ground.

  • Earthing is the process of connecting the metallic parts of an electrical system to the earth to prevent electric shock.

  • Grounding is the process of connecting electrical equipment to the ground to protect against electrical faults and lightning strikes.

  • Earthing and grounding provide a path for electrical current to flow safely into the ground, preventing damage to eq...read more

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Q15. What is motor ?

Ans.

A motor is a device that converts electrical energy into mechanical energy to produce motion.

  • Motors are commonly used in various applications such as industrial machinery, household appliances, and vehicles.

  • There are different types of motors including AC motors, DC motors, and servo motors.

  • Motors consist of a rotor, stator, and various components such as coils, magnets, and brushes.

  • Examples of motors include electric fans, washing machine motors, and car engines.

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Q16. What is acb ?

Ans.

ACB stands for Air Circuit Breaker, a type of circuit breaker that operates in the air instead of oil or gas.

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

  • It automatically cuts off the power supply when a fault is detected.

  • ACBs are commonly used in industrial and commercial buildings.

  • Examples of ACB manufacturers include Siemens, Schneider Electric, and ABB.

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