OSF Digital Interview Questions and Answers

Induction generators are used for variable frequency operation due to their inherent ability to self-regulate.

• Induction generators are self-excited and do not require a separate DC source for excitation.

• They can operate at variable speeds and frequencies without the need for complex control systems.

• They are commonly used in wind turbines and hydroelectric power plants.

• Induction generators are also more cost-effective compared to synchronous generators for variable frequency o...read more

Compensation is required in power systems to improve voltage stability, reduce losses, and maintain power quality.

• Compensation helps in maintaining voltage stability by regulating voltage levels within acceptable limits.

• It reduces losses in the transmission lines by improving power factor and reducing reactive power flow.

• Compensation also helps in maintaining power quality by reducing voltage fluctuations and harmonics.

• Examples of compensation devices include capacitors, reac...read more

Compensation techniques are used to improve power system stability and voltage regulation.

• Compensation techniques include shunt compensation, series compensation, and combined shunt-series compensation.

• Shunt compensation involves adding capacitors or reactors in parallel with the transmission line to improve voltage regulation.

• Series compensation involves adding capacitors in series with the transmission line to improve power transfer capability.

• Combined shunt-series compensa...read more

AVR regulates voltage output, while excitation control regulates generator field current.

• AVR (Automatic Voltage Regulator) is responsible for maintaining a constant voltage output from the generator.

• Excitation control regulates the generator field current to control the output voltage.

• AVR is a closed-loop system that measures the output voltage and adjusts the field current accordingly.

• Excitation control can be either manual or automatic and is used to control the reactive po...read more

Slip rings are used to transfer electrical power and signals between stationary and rotating parts of a motor or generator.

• Slip rings are typically made of copper or other conductive materials.

• They are mounted on the rotor of a motor or generator and make contact with stationary brushes.

• The slip rings allow for the transfer of electrical power and signals between the stationary and rotating parts of the machine.

• In a motor, slip rings are used to provide power to the rotor win...read more

AVR plays a crucial role in maintaining voltage stability by adjusting the excitation level of the generator based on system conditions.

• AVR stands for Automatic Voltage Regulator.

• It continuously monitors the system voltage and adjusts the excitation level of the generator to maintain voltage stability.

• AVR helps in regulating the terminal voltage of the generator within specified limits.

• It is essential for ensuring proper functioning of electrical equipment connected to the sy...read more