TCS Interview Questions and Answers

Transformers are devices that transfer electrical energy between two or more circuits through electromagnetic induction.

• Types of transformers include step-up, step-down, isolation, and auto-transformers

• Working principle involves the transfer of energy through mutual induction between coils

• Matching transformers are used to match impedance between two circuits for maximum power transfer

• Examples of matching transformers include audio transformers in amplifiers

The single line diagram is a simplified representation of an electrical power system showing the main components and their interconnections.

• Single line diagrams use standardized symbols to represent components like generators, transformers, switches, and loads.

• Lines connecting the components show the flow of electrical power through the system.

• The diagram helps in understanding the overall layout of the system and identifying key components and connections.

• It is commonly used...read more

Variable Frequency Drives (VFDs) are used to control the speed of an AC motor by varying the frequency and voltage supplied to the motor.

• VFDs are commonly used in industrial applications to control the speed of pumps, fans, compressors, and conveyor systems.

• They are also used in HVAC systems to control the speed of air handlers and chillers for energy efficiency.

• VFDs can help in reducing energy consumption, improving process control, and extending the lifespan of equipment.

• Th...read more

An induction motor is a type of AC motor where power is supplied to the rotor by electromagnetic induction.

• Induction motors are commonly used in various industrial applications due to their simplicity and reliability.

• The working principle involves a rotating magnetic field in the stator inducing current in the rotor, causing it to rotate.

• They do not require any physical connection between the stator and rotor, making them maintenance-free.

• Examples of induction motors include ...read more

Encoders and resolvers are devices used to convert mechanical motion into electrical signals for various applications.

• Encoders are used to measure the position, speed, and direction of rotating shafts in machinery.

• Resolvers are similar to encoders but provide higher resolution and accuracy.

• Applications include robotics, CNC machines, servo motors, and aerospace systems.

• Encoders use digital signals while resolvers use analog signals.

• Encoders are typically cheaper and easier to...read more