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10+ Dilip Buildcon Interview Questions and Answers

Updated 5 Feb 2024

Q1. How many types of transformer according to voltage transfer

Ans.

There are two types of transformers according to voltage transfer: step-up transformers and step-down transformers.

  • Step-up transformers increase the voltage from the primary winding to the secondary winding.

  • Step-down transformers decrease the voltage from the primary winding to the secondary winding.

  • Step-up transformers are used in power transmission to increase voltage for long-distance transmission.

  • Step-down transformers are used in power distribution to decrease voltage fo...read more

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Q2. What is the working principle of transformer

Ans.

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

  • Transformers consist of two or more coils of wire called windings.

  • When an alternating current (AC) flows through the primary winding, it creates a changing magnetic field.

  • This changing magnetic field induces a voltage in the secondary winding, which is connected to the load.

  • The ratio of the number of turns in the primary and secondary windings determines ...read more

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Q3. What is different between neutral and earth

Ans.

Neutral is a current-carrying conductor that completes an electrical circuit, while earth is a safety grounding conductor.

  • Neutral carries current back to the source in a balanced electrical system.

  • Earth is a safety measure to prevent electric shock and protect against electrical faults.

  • Neutral is typically connected to the center tap of a transformer, while earth is connected to the ground.

  • Neutral is part of the electrical distribution system, while earth is a safety feature....read more

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Q4. What is different b/w mpcb & mcb

Ans.

MPCB and MCB are both circuit protection devices, but they differ in terms of their applications and trip characteristics.

  • MCB stands for Miniature Circuit Breaker, while MPCB stands for Motor Protection Circuit Breaker.

  • MCBs are primarily used for residential and commercial applications, while MPCBs are specifically designed for motor protection in industrial settings.

  • MCBs have a fixed trip current rating and are typically used to protect circuits and appliances from overload ...read more

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Q5. Why stator use for induction motor

Ans.

The stator is used in an induction motor to generate a rotating magnetic field.

  • The stator consists of a set of windings that are connected to an AC power source.

  • When the AC power is applied, the stator windings create a rotating magnetic field.

  • This rotating magnetic field induces currents in the rotor, which in turn creates a torque and causes the rotor to rotate.

  • The stator windings are typically made of copper or aluminum and are arranged in a specific pattern to create the ...read more

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Q6. What is induction motor

Ans.

An induction motor is an AC electric motor in which power is supplied to the rotor by electromagnetic induction.

  • Induction motors are widely used in various applications, including industrial machinery, household appliances, and transportation systems.

  • They work based on the principle of electromagnetic induction, where a rotating magnetic field is created by the stator winding, inducing current in the rotor.

  • The rotor of an induction motor can be either squirrel cage or wound t...read more

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Q7. What is contactor

Ans.

A contactor is an electrical device used for switching an electrical circuit on or off.

  • Contactor is used to control the flow of electricity in a circuit.

  • It consists of a coil, contacts, and an enclosure.

  • When the coil is energized, the contacts close and allow current to flow.

  • Contactor is commonly used in motor control applications.

  • Examples of contactor include magnetic contactor and air conditioning contactor.

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Q8. How many types of earthing

Ans.

There are several types of earthing used in electrical engineering.

  • The most common types of earthing are:

  • - TN-S system: separate neutral and protective earth

  • - TN-C system: combined neutral and protective earth

  • - TN-C-S system: combination of TN-S and TN-C systems

  • - TT system: separate earth for each electrical installation

  • - IT system: no direct connection to earth, relies on insulation monitoring

  • Other types include:

  • - TN-R system: neutral is directly earthed at source

  • - TN-B syst...read more

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Q9. What is elcb

Ans.

ELCB stands for Earth Leakage Circuit Breaker. It is a safety device used to protect electrical circuits from electric shock.

  • ELCB is designed to detect small leakage currents that may occur due to insulation failure or faulty wiring.

  • When an ELCB detects a leakage current, it quickly cuts off the power supply to prevent electric shock.

  • ELCBs are commonly used in homes, offices, and industries to ensure electrical safety.

  • There are two types of ELCBs: voltage-operated ELCB and cu...read more

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Q10. What is relay

Ans.

A relay is an electrically operated switch that uses an electromagnet to mechanically control the switching action.

  • Relays are commonly used in electrical systems to control high power circuits with low power signals.

  • They consist of a coil, an armature, and one or more sets of contacts.

  • When the coil is energized, the armature is attracted and the contacts are closed or opened, depending on the relay type.

  • Relays can be used for various applications such as controlling motors, l...read more

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