Graduate Engineer Trainee - Electrical Interview Questions and Answers

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

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

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.

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

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