Toshiba Transmission & Distribution Systems Interview Questions and Answers

Aptitude test Consists of general English and domain (Electrical)

Q1. Basics questions of Transformer
Ans. 
1.Working principle of Transformer? 2.difference between 2 winding and auto transformer 3.From which voltage onwards conservative tank is constructed?
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Q2. Difference between power and distribution transformer
Ans. 
Power transformers are used to step up or step down voltage for transmission and distribution transformers are used to distribute power to end-users.
• Power transformers are typically used in power generation plants and substations.

• Distribution transformers are used to supply power to residential, commercial, and industrial areas.

• Power transformers have higher voltage ratings and are designed for long-distance transmissi...read more
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Q3. Required materials for design of Transformer
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The required materials for designing a transformer include a magnetic core, copper wire, insulation materials, and cooling systems.
• Magnetic core: Typically made of laminated iron or steel to provide a low reluctance path for the magnetic flux.

• Copper wire: Used for winding the primary and secondary coils to carry the electrical current.

• Insulation materials: Used to insulate the copper wire and prevent short circuits.

• Coo...read more
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Q4. Basic question of conservator tank,Buchholz relay,transformer oil used.
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Q1. Strength and weakness of candidate.
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The candidate's strength is their expertise in electrical design engineering, while their weakness is their limited experience in project management.
• Strength: Extensive knowledge and experience in electrical design engineering, including proficiency in CAD software and circuit design.

• Strength: Strong problem-solving skills and ability to troubleshoot complex electrical systems.

• Weakness: Limited experience in project ma...read more
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It is mainly about arthematic, reasoning, english, and mathematics

Q1. Difference between 1st angle and 3rd angle projection
Ans. 
1st angle projection is commonly used in Europe and Asia, while 3rd angle projection is commonly used in North America.
• 1st angle projection: object is placed in the first quadrant, with the plane of projection between the object and observer.

• 3rd angle projection: object is placed in the third quadrant, with the plane of projection behind the object.

• 1st angle projection is more intuitive for designers, while 3rd angle p...read more
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Q2. Confident about your self intro
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Q1. About your self details
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Q2. Project explain
Ans. 
I worked on a project to develop a mobile application for a local restaurant.
• The project involved designing the user interface and user experience of the app.

• I collaborated with a team of developers to build the app using React Native.

• We integrated features such as online ordering, menu browsing, and push notifications.

• I also conducted user testing and made improvements based on feedback.

• The project was completed withi...read more
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Q1. Subject wise questions.
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Q2. How do job performances.
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Job performances are evaluated based on the quality and quantity of work done, adherence to deadlines, teamwork, and communication skills.
• Quality and quantity of work done

• Adherence to deadlines

• Teamwork

• Communication skills
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Core related questions and aptitude

Q1. Related to technical and marketing
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Q1. HR questions and personal questions
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60 percent core and 40 percent aptitude

Q1. What are the tests done on a transformer
Ans. 
Tests done on a transformer include insulation resistance test, turns ratio test, winding resistance test, and load test.
• Insulation resistance test checks the insulation resistance between windings and between windings and ground.

• Turns ratio test measures the ratio of the number of turns in the primary winding to the number of turns in the secondary winding.

• Winding resistance test measures the resistance of each windin...read more
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Q2. Why CT and PT are used
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CT and PT are used in electrical systems for measurement and protection purposes.
• CT (Current Transformer) is used to measure high currents and step them down to a manageable level for measurement and protection devices.

• PT (Potential Transformer) is used to measure high voltages and step them down to a safe level for measurement and protection devices.

• CTs and PTs provide isolation and safety by separating the high volta...read more
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Q3. What is the generation voltage in india
Ans. 
The generation voltage in India varies depending on the location and power plant.
• The voltage ranges from 110V to 440V depending on the location.

• The power plants generate electricity at different voltages.

• The national grid operates at a voltage of 400kV and 765kV.

• India has a mix of AC and DC power transmission systems.
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Q4. Why do we use high voltage for transmission?
Ans. 
High voltage is used for transmission to reduce power loss and increase efficiency.
• High voltage reduces the current required for a given amount of power, which reduces power loss due to resistance in the transmission lines.

• Lower current also means smaller conductors can be used, reducing material and installation costs.

• High voltage transmission is more efficient over long distances, reducing the need for additional pow...read more
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Q5. Which power plant is cheapest to install
Ans. 
Renewable energy power plants are generally cheaper to install than traditional fossil fuel power plants.
• Renewable energy power plants such as solar, wind, and hydroelectric are cheaper to install than traditional fossil fuel power plants.

• The cost of installation for renewable energy power plants has decreased significantly in recent years due to advancements in technology and increased demand.

• Fossil fuel power plants ...read more
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Q6. Why OC test done on LV side and SC test on HV side of Transformers
Ans. 
OC test is done on LV side to avoid high voltage on secondary side. SC test is done on HV side to avoid high current on primary side.
• LV side has lower voltage rating, hence safer for OC test

• HV side has higher current rating, hence suitable for SC test

• OC test checks insulation resistance and winding resistance

• SC test checks impedance and voltage regulation

• Example: A 100 MVA transformer with 220 kV HV and 33 kV LV rating
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Q1. Questions asked on the last job work and experience and present job profile
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Q1. Salary discussion
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