Electrical India Interview Questions and Answers

DOL starter is a direct online starter used to start and stop the motor instantly.

• DOL stands for Direct Online.

• It is used to start and stop the motor instantly.

• It is the simplest and cheapest method of starting a motor.

• It consists of a contactor, overload relay, and start and stop push buttons.

• It is used for small motors up to 5 horsepower.

• It is not suitable for large motors as it causes a high starting current.

• Example...read more

Multithreading is the ability of a program to perform multiple tasks concurrently.

• Multithreading allows for better utilization of CPU resources

• It can improve program performance and responsiveness

• Examples include running multiple downloads simultaneously or updating a GUI while performing a background task

• Synchronization is important to prevent race conditions and ensure thread safety

Multithreading in Java allows concurrent execution of multiple threads.

• Java provides built-in support for multithreading through the java.lang.Thread class.

• Threads can be created by extending the Thread class or implementing the Runnable interface.

• The start() method is used to start a new thread, which calls the run() method.

• Synchronization mechanisms like synchronized blocks and locks can be used to control access to ...read more

No, Java does not support multiple inheritance. However, interfaces can inherit multiple interfaces.

• Java does not allow a class to inherit from multiple classes.

• This is because multiple inheritance can lead to ambiguity and conflicts.

• However, a class can implement multiple interfaces in Java.

• An interface can extend multiple interfaces, allowing for inheritance of multiple interfaces.

• This is known as interface inheritan

DO-WHILE loop executes the code block at least once, while WHILE loop executes only if the condition is true.

• DO-WHILE loop checks the condition at the end of the loop

• WHILE loop checks the condition at the beginning of the loop

• DO-WHILE loop executes the code block at least once

• WHILE loop may not execute the code block at all if the condition is false

I would rate myself as an 8 on a scale of 1-10.

• I have a strong understanding of software development principles and practices.

• I have experience working with multiple programming languages and frameworks.

• I am skilled in problem-solving and debugging.

• I have successfully delivered complex software projects in the past.

• I continuously strive to learn and improve my skills.

Display data of two tables by joining them using a common column.

• Use SQL JOIN statement to combine data from two tables based on a common column.

• Choose the appropriate type of JOIN based on the relationship between the tables.

• Specify the columns to be displayed in the SELECT statement.

• Use aliases to differentiate between columns with the same name in both tables.

• Apply any necessary filters or sorting to the result set.