Infosys Electrical Supervisor Interview Questions and Answers

A dropout switch is an electrical switch that opens when the voltage drops below a certain level.

• It is used to protect electrical equipment from damage due to low voltage.

• It can be manually or automatically reset.

• Examples include low voltage disconnect switches and thermal overload switches.

• It is commonly used in battery systems to prevent over-discharge.

• It is also used in power distribution systems to prevent damage t

A diode is an electronic component that allows current to flow in only one direction.

• It has two terminals, an anode and a cathode.

• It is commonly used in rectifiers to convert AC to DC.

• It can also be used as a voltage regulator or a signal modulator.

• It is made of semiconductor materials such as silicon or germanium.

• It has a forward voltage drop that varies depending on the material and temperature.

HRC fuse stands for High Rupturing Capacity fuse. It is a type of fuse that can withstand high fault currents.

• HRC fuse is designed to protect electrical equipment from overcurrents.

• It has a high breaking capacity and can interrupt high fault currents without causing damage to the equipment.

• HRC fuse is commonly used in industrial and commercial applications.

• It is available in different sizes and ratings to suit differen...read more

The RPM of a 4 pole motor is determined by the frequency of the power supply and the number of poles.

• The RPM of a 4 pole motor is directly proportional to the frequency of the power supply.

• The RPM of a 4 pole motor is inversely proportional to the number of poles.

• For example, a 4 pole motor connected to a 60 Hz power supply will have an RPM of approximately 1800.

• If the power supply frequency is increased to 120 Hz, the...read more

Yes, 10 kW is equal to 13.41 HP.

• 1 kW = 1.34 HP

• Therefore, 10 kW = 10 x 1.34 = 13.41 HP

• Conversion formula: HP = kW x 1.34

An isolator is an electrical switch that isolates a part of the circuit from the rest for maintenance or safety purposes.

• Isolators are used to disconnect a circuit from the power source.

• They are often used in high voltage applications.

• Isolators are different from circuit breakers or fuses, as they do not provide protection against overloads or short circuits.

• They are commonly used in industrial settings and power distr...read more

DC voltage is a constant voltage while AC voltage changes direction periodically.

• DC voltage is a steady voltage that flows in one direction only

• AC voltage changes direction periodically and has a frequency measured in Hertz

• DC voltage is commonly used in batteries and electronic devices

• AC voltage is used in household power outlets and electrical grids

A motor's speed can be controlled by a variable frequency drive (VFD).

• A VFD can adjust the frequency of the electrical power supplied to the motor, which in turn controls its speed.

• VFDs are commonly used in industrial settings to control the speed of motors powering machinery.

• VFDs can also improve energy efficiency by reducing the amount of power consumed by the motor.

• Other methods of controlling motor speed include us...read more

A program to replace a character with another character in Java.

• Create a string variable with the original text

• Use the replace() method to replace the character with another character

• Print the new string with the replaced character

A framework is a set of guidelines, standards, and tools used to develop software applications.

• A framework provides a structure for developers to build upon

• It includes pre-written code and libraries to simplify development

• Frameworks can be specific to a programming language or platform

• Examples include React for web development and TensorFlow for machine learning

Swap two numbers with and without temporary variable

• Without temporary variable: Use addition and subtraction

• With temporary variable: Use a third variable to store the value of one of the numbers

• Example without temporary variable: a=5, b=7; a=a+b; b=a-b; a=a-b;

• Example with temporary variable: a=5, b=7; temp=a; a=b; b=temp;

Second level cache is a caching mechanism used to improve performance by storing frequently accessed data in memory.

• Second level cache is implemented at the application level and can be configured using frameworks like Hibernate.

• To optimize SQL queries, one can use indexes, avoid using SELECT *, and use JOINs instead of subqueries.

• SOLID principles are a set of design principles for writing maintainable and scalable cod...read more

To deploy an application in AWS, you need to create an EC2 instance, configure security groups, install necessary software, and upload your application code.

• Create an EC2 instance in the desired region and select the appropriate instance type

• Configure security groups to allow traffic to and from the instance

• Install necessary software and dependencies on the instance

• Upload your application code to the instance

• Start the ...read more