500+ Lead Engineer Interview Questions and Answers

The resistance value of tripping & closing coil of VCB varies depending on the manufacturer and model.

• The resistance value can be found in the manufacturer's manual or datasheet.

• It is important to use the correct resistance value to ensure proper functioning of the VCB.

• The resistance value may also vary depending on the voltage rating of the VCB.

• For example, the ABB VD4 VCB has a tripping coil resistance of 50-60 ohms and a closing coil resistance of 20-30 ohms.

The contact resistance of VCB is typically very low.

• VCB stands for Vacuum Circuit Breaker.

• The contact resistance is the resistance between the contacts of the breaker when it is closed.

• The contact resistance of VCB is typically in the range of micro-ohms.

• Low contact resistance is important for efficient operation of the breaker.

• High contact resistance can cause overheating and damage to the breaker.

• The contact resistance can be affected by factors such as the material of the ...read more

BGP path attributes used to manipulate ingress traffic and transit via 3rd AS.

• AS Path attribute is used to manipulate ingress traffic by adding or removing AS numbers.

• Local Preference attribute is used to influence the path selection within the same AS.

• MED (Multi-Exit Discriminator) attribute is used to influence the path selection between different ASes.

• Communities attribute is used to tag routes and influence the path selection in a specific way.

• Transit traffic via 3rd AS c...read more

Java 8 introduced new features like lambda expressions, functional interfaces, and streams. Functional interfaces have a single abstract method. Runnable is a functional interface for running a task in a separate thread, while Callable is a functional interface that can return a result and throw checked exceptions.

• Java 8 introduced lambda expressions for writing concise code.

• Functional interfaces have a single abstract method, such as Runnable or Callable.

• Runnable is a functi...read more

Approach: Create a program to clear a grid by moving a ball in all 8 directions and clearing cells at the center.

• Create a grid with values in each cell

• Randomly select a starting point and direction for the ball

• Move the ball in all 8 directions, clearing cells at the center

• Reroute the ball when it reaches the edge

• Continue until all cells are cleared

An IEnumerator in C# is used to iterate over a collection of objects one at a time, allowing for more efficient memory usage and performance.

• IEnumerator is used to implement custom iterators in C# by defining a method with a yield return statement.

• Each time the iterator is called, it returns the next value in the sequence defined by the yield return statements.

• IEnumerators can be used in foreach loops to iterate over the values returned by the iterator.

The minimum height at which the safety belt should be used is determined by the height of the individual and the specific safety regulations in place.

• The minimum height requirement for safety belt usage varies depending on the country and jurisdiction.

• In the United States, for example, the minimum height for safety belt usage is typically around 4 feet 9 inches (145 cm).

• Other factors such as age, weight, and type of vehicle may also influence the minimum height requirement.

• It...read more

Code to find strings in a dictionary matching a given pattern

• Iterate through the dictionary and check if each string matches the pattern

• Add the matching strings to an output array

• Return the output array

Create a new array with sums of all integers smaller than each element in the input array.

• Iterate through the input array and for each element, calculate the sum of all integers smaller than the current element.

• Populate the new array with these sums.

• Use a lambda expression to simplify the code.

VTep is a virtual tunnel endpoint used in VXLAN to extend Layer 2 networks over Layer 3 networks.

• VTep is a software-based endpoint that terminates VXLAN tunnels.

• It is used to extend Layer 2 networks over Layer 3 networks.

• VXLAN header encapsulates the original Ethernet frame and adds a 24-bit VXLAN Network Identifier (VNI) to identify the virtual network.

• The VLAN data is encapsulated with VXLAN header and fields like VNI, flags, and reserved bits are used in it.

The question is asking to select a column named 'columnname' as '1' from the employee table and provide the output if the table contains 100 records.

• The column 'columnname' does not exist in the employee table, so the query will result in an error.

• The value '1' will be selected for each record in the employee table, resulting in 100 rows with the value '1'.

• The output will be a single column with 100 rows, all containing the value '1'.

Yes, I have extensive experience in electrical operation and maintenance.

• I have worked as an electrical engineer for 10+ years

• I have successfully managed and maintained electrical systems in various industries

• I have a strong understanding of electrical codes and regulations

• I have experience with troubleshooting and repairing electrical systems

• I am constantly learning and staying up-to-date with new technologies and advancements in the field

Implementing business classifications in ECM involves structured governance and retention policies for effective information management.

• Conduct a thorough analysis of the organization's data types and business processes to identify classification needs.

• Develop a classification schema that aligns with business objectives, such as categorizing documents by department, project, or compliance requirements.

• Implement metadata tagging for documents to facilitate easy retrieval and e...read more

VSL is the voltage at which the substrate current becomes zero in VSS.

• VSL is the voltage at which the substrate current becomes zero in VSS.

• It is the minimum voltage required to maintain a zero substrate current.

• VSL is important in VSS as it helps in reducing the leakage current.

• It is achieved by applying a negative voltage to the substrate.

• VSL is typically set to -0.5V or -1.0V in modern CMOS processes.

ARCADY and PICADY software require input such as road geometry, traffic flow, and vehicle characteristics.

• Road geometry data such as lane widths, radii, and gradients

• Traffic flow data such as traffic volume, speed, and composition

• Vehicle characteristics such as dimensions, speed, and acceleration

• Other inputs such as signal timings and pedestrian crossings

To create and upload a release application on Android and/or iOS, you need to follow specific steps for each platform.

• For Android, you need to generate a signed APK using Android Studio and then upload it to the Google Play Store.

• For iOS, you need to create an archive in Xcode, validate it, and then distribute it through the App Store Connect.

• Make sure to follow the guidelines and requirements set by Google and Apple for releasing applications on their platforms.

OSPF should be priority over eBGP. Achieve this by manipulating administrative distance or metric.

• OSPF should be preferred over eBGP as it is an interior gateway protocol while eBGP is an exterior gateway protocol

• Manipulate administrative distance to make OSPF preferred over eBGP

• Manipulate metric to make OSPF preferred over eBGP

• Use route maps to manipulate the preference of OSPF over eBGP

• Example: set the administrative distance of OSPF to a lower value than eBGP

• Example: incre...read more

Microservices utilize various data storage patterns like per service DB, shared DB, SAGA, and event sourcing for effective data management.

• Per Service DB: Each microservice has its own database, promoting loose coupling. Example: User service with its own user database.

• Shared DB: Multiple services share a single database, which can lead to tight coupling. Example: Both Order and Payment services using the same database.

• SAGA: A pattern for managing distributed transactions by ...read more

I review/check work of an originator in Civil3D Models by following a systematic approach.

• I check for errors and inconsistencies in the model.

• I verify that the model adheres to the project standards and specifications.

• I ensure that the model is accurate and complete.

• I communicate with the originator to clarify any issues or concerns.

• I document any changes or revisions made to the model.

• I perform a final review before submitting the model for approval.

Answers to questions related to stress and strain in engineering

• True stress considers the change in area due to deformation, while engineering stress does not

• True stress can be derived from engineering stress using the formula: true stress = engineering stress * (1 + engineering strain)

• Quad elements are preferred over tria elements because they provide better accuracy and convergence

• Plane stress is a condition where stress is only present in two dimensions, while plane strain...read more

VDC stands for Virtual Design and Construction. Supervisor oversees VDC process.

• VDC is a process of creating a digital model of a construction project before it is built.

• It helps in identifying and resolving potential issues before construction begins.

• Supervisor oversees the VDC process to ensure that the digital model is accurate and meets the project requirements.

• VDC can also help in improving communication and collaboration among different stakeholders involved in the proj...read more

NVH stands for Noise, Vibration, and Harshness. Single line exhaust and dual line exhaust refer to the number of exhaust pipes in a vehicle.

• NVH refers to the level of noise, vibration, and harshness in a vehicle

• Single line exhaust has one exhaust pipe while dual line exhaust has two

• Dual line exhaust can improve engine performance and sound

• NVH is an important factor in vehicle design and can affect customer satisfaction

BGP community is a way to tag routes with additional information. It helps in controlling the flow of traffic.

• BGP community is a 32-bit number that can be attached to a route advertisement.

• It is used to tag routes with additional information.

• It helps in controlling the flow of traffic by allowing network administrators to manipulate the way BGP routes are propagated and selected.

• BGP communities can be used to implement policies such as traffic engineering, route filtering, an...read more

TreeSet prints elements in natural order. Employee objects will be printed based on their natural order.

• TreeSet prints elements in natural order

• Employee objects will be printed based on their natural order

• Natural order of Employee objects is determined by their implementation of Comparable interface

Ball valves have a spherical closure unit while gate valves have a wedge-shaped closure unit.

• Ball valves are quick to open and close, while gate valves take longer.

• Ball valves are better for controlling flow, while gate valves are better for on/off control.

• Ball valves are commonly used in applications such as water supply, oil and gas, and chemical processing.

• Gate valves are commonly used in applications such as irrigation, fire protection, and HVAC systems.

Yes, I have experience in testing. Types of testing include unit testing, integration testing, system testing, and acceptance testing.

• Unit testing involves testing individual components or functions of the software.

• Integration testing checks if different modules work together correctly.

• System testing ensures the entire system functions as expected.

• Acceptance testing involves testing the software with end-users to ensure it meets requirements.

Executable files are present in bindir and configuration files are present in sysconfigdir in Linux.

• bindir typically contains executable files such as binaries and scripts

• sysconfigdir typically contains configuration files for system-wide settings

• Examples: /usr/bin/ contains executable files, /etc/sysconfig/ contains configuration files