Schneider Electric Diploma Electrical Engineer Interview Questions and Answers

Q1. What is circuit breakers
Ans. 
Circuit breakers are electrical switches designed to protect electrical circuits from damage caused by overload or short circuit.
• Circuit breakers automatically stop the flow of electricity when a fault is detected.

• They can be reset manually after tripping.

• Common types include thermal-magnetic, magnetic, and thermal circuit breakers.

• Examples include miniature circuit breakers (MCBs) and molded case circuit breakers (MCC
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Q2. What is difference contractor or relay
Ans. 
Contractor is a device used to make or break an electrical circuit, while relay is an electromagnetic switch that opens or closes circuits.
• Contractor is typically used for high power applications, while relay is used for low power applications.

• Contractor is usually larger in size and can handle higher currents, while relay is smaller and handles lower currents.

• Contractors are commonly used in industrial settings for co...read more
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Q3. What is difference neutral or earthing
Ans. 
Neutral is a current-carrying conductor that completes the circuit, while earthing is a safety measure to prevent electric shock.
• Neutral wire carries current back to the source in a circuit

• Earthing provides a path for fault currents to flow safely to the ground

• Neutral wire is typically connected to the center tap of a transformer

• Earthing is done by connecting metal parts of electrical equipment to the earth
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Q4. What is star or delta
Ans. 
Star and delta are two types of connections used in electrical circuits.
• Star connection is a type of electrical connection where all the components are connected at a common point, forming a star shape.

• Delta connection is a type of electrical connection where the components are connected in a triangular shape, resembling the Greek letter delta.

• Star connection is commonly used in three-phase AC circuits, while delta con...read more
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Q5. What is use contractor
Ans. 
A contractor is a person or company hired to perform work on a specific project or job.
• Contractors are hired to complete tasks that the hiring company may not have the expertise or resources to do themselves.

• Contractors can be hired for various projects such as construction, electrical work, plumbing, etc.

• Contractors are typically paid for their services based on a contract or agreement outlining the scope of work, tim
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Q1. What is current?
Ans. 
Current is the flow of electric charge through a conductor.
• Current is measured in Amperes (A).

• It is the rate of flow of electric charge.

• Current flows from high potential to low potential.

• There are two types of current - AC (Alternating Current) and DC (Direct Current).

• Examples of current sources include batteries, generators, and power plants.
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Q2. Define Resistance?
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Resistance is the opposition to the flow of electric current in a circuit.
• Resistance is measured in ohms (Ω).

• It is caused by the collisions of electrons with atoms in a conductor.

• Higher resistance leads to lower current flow in a circuit.

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

• Examples of resistors include light bulbs, heating elements, and electronic
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Q3. What is Ohm law
Ans. 
Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage applied across it, and inversely proportional to the resistance of the conductor.
• Ohm's Law is represented by the formula V = I * R, where V is voltage, I is current, and R is resistance.

• It helps in calculating the relationship between voltage, current, and resistance in an electrical circuit.

• It was formulated by German...read more
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Q4. What is the voltage?
Ans. 
Voltage is the difference in electric potential between two points, measured in volts.
• Voltage is the potential difference between two points in an electrical circuit

• It is measured in volts (V)

• Voltage is responsible for the flow of current in a circuit

• Higher voltage means more potential energy available to move electrons

• Examples: 120V in household outlets, 12V in car batteries
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Q5. Whats is the drift Velocity?
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Drift velocity is the average velocity of charge carriers in a particular direction under the influence of an electric field.
• Drift velocity is a result of the electric field applied to a conductor.

• It is typically very small, on the order of millimeters per second.

• Drift velocity is influenced by the material of the conductor and the strength of the electric field.

• It is an important concept in understanding current flow
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