Medha Servo Drives Service Engineer Interview Questions, Process, and Tips

Mathematics, reasoning

Q1. Electric and electronic
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Q2. Resistor calculation- series/parralal
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Q3. Unit of capacitance, inductance
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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
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Q4. Motor work, different electrical symbol
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Q1. Salary expectation
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Q1. Transformer principle
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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.

• Tra...read more
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Q2. Motor dc and ac
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Q3. Capacitor inductor resistance
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Railways about rail manufacturing

Normal electrical basic question asking and some regioning quetion also askin aptitude test.

Q1. Basic of transformer
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Q2. Igbt working process
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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
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Q3. Scr working process
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SCR (Silicon Controlled Rectifier) is a semiconductor device used for controlling large amounts of electrical power.
• SCR is a type of thyristor used in power control applications.

• It consists of four layers of alternating N and P-type material.

• SCR works by controlling the flow of current between the anode and cathode.

• It requires a trigger signal to turn on and start conducting.

• Once triggered, SCR will continue to conduct...read more
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Q4. Bridge rectifier working process
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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.
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Q5. Symbols of diode scr igbt thyristor
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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
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