Thejo Engineering Senior Electrical Engineer Interview Questions and Answers

Q1. What are the applications of motor starters?
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Q2. What are the fundamentals of the power triangle?
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Q1. Substation questions
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Q2. Primary engineering questions
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The test is very difficult you have to complete all 20 questions which consist GC , subject related

Q1. What is the wave trape?
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A wave trap is a device used in electrical engineering to prevent unwanted signals or frequencies from entering a system.
• Wave traps are typically used in power systems to filter out specific frequencies that can cause interference.

• They are designed to allow only desired signals to pass through while blocking unwanted signals.

• Wave traps can be used in substations, transmission lines, and other electrical systems to impr...read more
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Q2. Which types of circuit breaker use in substation
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Types of circuit breakers used in substations include air circuit breakers, oil circuit breakers, vacuum circuit breakers, and SF6 circuit breakers.
• Air circuit breakers are commonly used in low voltage applications.

• Oil circuit breakers are used in high voltage applications.

• Vacuum circuit breakers are compact and reliable, suitable for medium voltage applications.

• SF6 circuit breakers are used in high voltage substations
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Q1. Working of power transformer
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A power transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.
• Power transformers are used to step up or step down voltage levels in electrical power transmission and distribution systems.

• They consist of a primary winding, a secondary winding, and a magnetic core.

• When an alternating current flows through the primary winding, it creates a magne...read more
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Q1. ANY ONE electrical SOLAR WORK
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Q2. Solar work electrical maintenance
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Q1. Transformer tests
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Q1. How to charge the Transformer?
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A transformer can be charged by applying a voltage to its primary winding.
• To charge a transformer, connect a power source to its primary winding

• The voltage applied to the primary winding creates a magnetic field

• This magnetic field induces a voltage in the secondary winding

• The transformer is charged and ready to transfer power
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Q2. Parts of transformer
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Parts of a transformer include the core, windings, and insulation.
• Core: Provides a path for magnetic flux and is usually made of laminated iron or steel.

• Windings: Consist of primary and secondary coils, which are wound around the core.

• Insulation: Prevents electrical leakage and is used to separate the windings and core.

• Tap changer: Allows for voltage regulation by changing the number of turns in the winding.

• Cooling sys...read more
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