Nagarjuna Fertilizers and Chemicals Technical Assistant Interview Questions and Answers

A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.

• Transformers are used to increase or decrease voltage levels in electrical circuits.

• They consist of two coils of wire, known as the primary and secondary coils, wrapped around a core.

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

• Transf...read more

A motor is a device that converts electrical energy into mechanical energy to produce motion.

• Motors are commonly used in various applications such as industrial machinery, household appliances, and vehicles.

• There are different types of motors including AC motors, DC motors, and servo motors.

• Motors consist of a rotor, stator, and various components such as coils, magnets, and brushes.

• Examples of motors include electric

A DOL starter is a Direct-On-Line starter used to start induction motors by directly connecting them to the power supply.

• DOL starters provide full voltage to the motor during starting.

• They are simple in design and cost-effective.

• Commonly used in applications where the motor load is constant and does not require speed control.

• Example: Starting a water pump motor in a residential building.

There are various types of motors including DC motors, AC motors, stepper motors, and servo motors.

• DC motors operate on direct current and are commonly used in household appliances and electric vehicles.

• AC motors operate on alternating current and are used in industrial applications.

• Stepper motors move in precise increments and are commonly used in 3D printers and CNC machines.

• Servo motors are controlled by a feedback ...read more

There are various types of starters used in electrical engineering, such as DOL starter, star-delta starter, and soft starter.

• Direct On-Line (DOL) starter is the simplest type, providing full voltage to the motor at start.

• Star-delta starter reduces the starting current by initially connecting the motor in star configuration and then switching to delta.

• Soft starter gradually increases the voltage to the motor, reducing ...read more

Starters are used to control the starting and stopping of motors. Types include DOL, star-delta, soft starters, and VFDs.

• Direct-On-Line (DOL) starters provide full voltage to the motor at start-up

• Star-Delta starters reduce the voltage during start-up to reduce inrush current

• Soft starters gradually increase the voltage to the motor to reduce inrush current and mechanical stress

• Variable Frequency Drives (VFDs) control th...read more