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Power Research & Development Consultants

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MRS Coating Solutions Interview Questions and Answers

Updated 5 Feb 2024

Q1. What are the type of faults in power system.

Ans.

There are various types of faults in power system.

  • Short circuit fault

  • Open circuit fault

  • Ground fault

  • Overvoltage fault

  • Undervoltage fault

  • Overcurrent fault

  • Underfrequency fault

  • Overfrequency fault

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Q2. Different sequence of current present in SLG, LLG, LLLG faults.

Ans.

Different sequence of current in SLG, LLG, LLLG faults.

  • SLG fault has only one phase grounded, LLG fault has two phases grounded, LLLG fault has all three phases grounded

  • In SLG fault, the sequence of current is positive-negative-zero, in LLG fault it is zero-positive-negative, and in LLLG fault it is zero-zero-zero

  • These faults can cause damage to electrical equipment and must be quickly detected and resolved

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Q3. What is swing equations?

Ans.

Swing equations are used to model the behavior of power systems during transient events.

  • Swing equations are a set of differential equations that describe the dynamics of power systems during transient events.

  • They are used to model the behavior of generators, transformers, and other components in the power system.

  • Swing equations take into account the mechanical and electrical properties of the system, as well as the power flow and voltage levels.

  • They are important for analyzin...read more

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Q4. What is equal area criteria.

Ans.

Equal area criteria is a method to determine stability of power systems.

  • It is used to analyze transient stability of power systems.

  • It states that for a power system to be stable, the area of the power-angle curve during fault should be equal to the area of the power-angle curve after fault clearance.

  • It helps in determining the critical clearing angle and time required for fault clearance.

  • It is based on the assumption that the power system can be represented by a swing equatio...read more

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Q5. Methods to solve load flow

Ans.

Load flow can be solved using various methods.

  • Gauss-Seidel method

  • Newton-Raphson method

  • Fast decoupled method

  • DC load flow method

  • AC load flow method

  • Continuation power flow method

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Q6. Motor EMF equations.

Ans.

Motor EMF equations are mathematical equations that describe the relationship between the voltage generated by a motor and its speed and magnetic field.

  • EMF equations are used to calculate the voltage generated by a motor as it rotates.

  • The equations take into account the motor's speed, magnetic field strength, and number of turns in the coil.

  • The EMF equations are important for designing and optimizing motors for specific applications.

  • Examples of EMF equations include Faraday's...read more

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Q7. Different types of faults

Ans.

Different types of faults in electrical engineering include short circuit, open circuit, ground fault, and overload.

  • Short circuit: occurs when two conductors come into contact with each other, causing a sudden increase in current flow.

  • Open circuit: occurs when there is a break in the circuit, preventing current flow.

  • Ground fault: occurs when a live conductor comes into contact with the ground, causing current to flow through the ground.

  • Overload: occurs when the current flowin...read more

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