Stock Holding Corporation of India Trainee Interview Questions and Answers

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 a...read more

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 iden...read more

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 i

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 p...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 t...read more

I/O modules are devices used to connect external devices to a computer system, allowing for input and output operations.

• I/O modules facilitate communication between the CPU and external devices such as printers, scanners, and sensors.

• They typically consist of input ports for receiving data from external devices and output ports for sending data to external devices.

• I/O modules can be analog or digital, depending on the ...read more