CG Power and Industrial Solutions Junior Engineer Electrical Interview Questions and Answers

Q1. What is Transformer?
Ans. 
A transformer is a device that transfers electrical energy between two or more circuits through electromagnetic induction.
• Consists of two coils of wire, known as primary and secondary coils

• Works on the principle of electromagnetic induction

• Used to step up or step down voltage levels in electrical circuits

• Commonly used in power distribution systems
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Q2. What is transformer Protection
Ans. 
Transformer protection refers to the measures taken to prevent damage to transformers from faults or abnormal operating conditions.
• Transformer protection devices include overcurrent relays, differential relays, and Buchholz relays.

• Overcurrent relays protect against overloads and short circuits.

• Differential relays compare the current entering and leaving the transformer to detect internal faults.

• Buchholz relays detect g...read more
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Q1. Electrical engineering
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Q2. Electrical motor
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Q3. Electrical equipment
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Q1. Electrical maintenance
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Q2. Electrical motor
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Q1. Basic questions
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Q2. Previous employer related
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Q1. Technical questions
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Q2. Machine related
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Over all plant related

Q1. Man power handle and previous employer related
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Q1. Salary discussion and total experience
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Q1. REC Standard LT and HT line overhead and underground
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Q1. Final salary discussion
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Q1. What is polymorphism?
Ans. 
Polymorphism is the ability of a single function or method to operate on different types of data.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example: Inheritance in object-oriented programming languages like Java allows for polymorphism.

• Example: Function overloading
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Q2. Design a 3 but up/down counter?
Ans. 
A 3-bit up/down counter can be designed using flip-flops and logic gates.
• Use 3 D flip-flops to store the count value.

• Connect the Q output of each flip-flop to the D input of the next flip-flop.

• Use logic gates to control the direction of counting (up or down).
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Q1. What is 3-phase 4 wair system
Ans. 
A 3-phase 4 wire system is a type of electrical system commonly used for power distribution.
• Consists of three conductors carrying alternating current at the same frequency, with a fourth neutral conductor

• Provides a more balanced and efficient power distribution compared to single-phase systems

• Commonly used in industrial and commercial applications for higher power requirements

• Example: Used in large factories, office bu
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Q2. Which of the following is a characteristic of digital signal
Ans. 
A characteristic of digital signal is that it is discrete and represented by binary numbers.
• Digital signals are represented by discrete values

• Digital signals are represented by binary numbers (0s and 1s)

• Digital signals are less susceptible to noise compared to analog signals
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Q3. An electrical signal can be represented in either Thevenin form or Norton From. However, Norton representation is preferred when
Ans. 
Norton representation is preferred when the load impedance is known and fixed.
• Norton representation is preferred when the load impedance is known and fixed, as it simplifies calculations.

• Thevenin representation is preferred when the load impedance is unknown or variable.

• Norton equivalent circuits are easier to analyze in terms of current flow and power calculations.

• Thevenin equivalent circuits are easier to analyze in
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Diploma in electrical engineering