Bangalore Metro Rail Corporation 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