Graduate Engineer Trainee - Electrical Interview Questions and Answers for Freshers

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

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

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