Graduate Engineer Trainee - Electrical

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Graduate Engineer Trainee - Electrical Interview Questions and Answers

Updated 10 Apr 2023

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Q1. What is the mechanical protection of Transformer

Ans.

Mechanical protection of transformer includes tank, core, winding, and insulation.

  • The transformer tank provides protection against external damage and environmental factors.

  • The core is protected by clamping structures to prevent movement and vibration.

  • The winding is insulated and supported by a bobbin or coil form.

  • The insulation system protects the winding from mechanical damage and electrical breakdown.

  • Buchholz relay and pressure relief valves are used for protection against...read more

Q2. What are negatives in you

Ans.

I tend to overthink and get anxious at times.

  • I can be overly critical of myself and my work

  • I sometimes struggle with time management

  • I am not very comfortable with public speaking

  • I can be indecisive in certain situations

Graduate Engineer Trainee - Electrical Interview Questions and Answers for Freshers

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Q3. PWM STRATEGIES FOR GATE DRIVEN SWITCHES

Ans.

PWM strategies are used to control the switching of gate driven switches.

  • PWM stands for Pulse Width Modulation.

  • It is used to control the amount of power delivered to a load.

  • Common PWM strategies include: constant frequency, variable frequency, and phase-shifted.

  • PWM is commonly used in motor control, power supplies, and lighting applications.

Q4. EDUCATIONAL TRENDS IN RECENT YEARS

Ans.

Recent educational trends include online learning, personalized education, and emphasis on STEM education.

  • Online learning has become more prevalent due to advancements in technology and the COVID-19 pandemic.

  • Personalized education focuses on tailoring learning experiences to individual students' needs and interests.

  • STEM education (Science, Technology, Engineering, and Mathematics) has gained importance due to the growing demand for skilled workers in these fields.

  • Project-base...read more

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Q5. DC-DC CONVERTER OPERATION

Ans.

DC-DC converter is an electronic circuit that converts a source of direct current (DC) from one voltage level to another.

  • DC-DC converter is used to step up or step down the voltage level of DC power supply.

  • It uses inductors and capacitors to store and transfer energy.

  • Types of DC-DC converters include buck, boost, buck-boost, and flyback converters.

  • DC-DC converters are commonly used in electronic devices such as mobile phones, laptops, and power supplies.

  • Efficiency of DC-DC co...read more

Q6. LOSSES IN TRANSFORMER

Ans.

Losses in transformer are of two types - copper losses and iron losses.

  • Copper losses occur due to resistance of the winding and are proportional to the square of the current.

  • Iron losses occur due to hysteresis and eddy currents in the core and are constant at all loads.

  • Total losses in a transformer are the sum of copper losses and iron losses.

  • Efficiency of a transformer is the ratio of output power to input power and is affected by losses.

  • Reducing losses in a transformer can ...read more

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