Medha Servo Drives Service Engineer Interview Questions and Answers

Unit of electrical terms for induction motor include voltage, current, power factor. LVDT transducers measure displacement. VFD stands for Variable Frequency Drive.

• Unit of electrical terms for induction motor: voltage, current, power factor

• LVDT transducers measure displacement

• VFD stands for Variable Frequency Drive

Symbols of diode, SCR, IGBT, and thyristor are important for understanding and troubleshooting electronic circuits.

• Diode symbol: Arrow pointing towards a line representing the cathode

• SCR symbol: Three layers with a gate, anode, and cathode

• IGBT symbol: Combination of a MOSFET and a bipolar transistor

• Thyristor symbol: Similar to SCR but with an additional gate terminal

Capacitance is measured in farads (F) and inductance is measured in henrys (H).

• Capacitance is the ability of a component to store electrical charge, measured in farads (F)

• Inductance is the ability of a component to store energy in a magnetic field, measured in henrys (H)

• Examples: Capacitors have capacitance measured in farads, while inductors have inductance measured in henrys

A bridge rectifier is a type of full-wave rectifier that converts AC to DC by using four diodes in a bridge configuration.

• Bridge rectifier uses four diodes to convert AC to DC.

• It rectifies both halves of the AC input waveform.

• The output voltage is the absolute value of the input voltage.

• Commonly used in power supplies and battery chargers.

Transformer principle involves electromagnetic induction to transfer electrical energy between two or more circuits.

• Transformers work based on Faraday's law of electromagnetic induction.

• They consist of primary and secondary coils wound around a core.

• Step-up transformers increase voltage while step-down transformers decrease voltage.

• Efficiency of transformers is determined by the ratio of output power to input power.

• Transformers are used in power distribution, electronics, and...read more

IGBT stands for Insulated Gate Bipolar Transistor, a semiconductor device used for switching applications in power electronics.

• IGBT combines the advantages of MOSFETs and bipolar transistors

• It has three terminals: gate, collector, and emitter

• Works by controlling the voltage applied to the gate terminal to switch the device on and off

• Used in applications like motor drives, inverters, and power supplies