300+ ZingHR Interview Questions and Answers

Yes, I know how to operate air circuit breaker.

• I am familiar with the basic components of an air circuit breaker.

• I know how to turn on and off the breaker.

• I am aware of the safety precautions that need to be taken while operating the breaker.

• I have experience in troubleshooting and repairing air circuit breakers.

• I am knowledgeable about the different types of air circuit breakers and their applications.

Answering questions related to thermodynamic cycle, power plant engineering, steam engine and steam turbine.

• A thermodynamic cycle is a series of processes that convert heat into work.

• Power plant engineering deals with the design, construction, and operation of power plants.

• Steam engine uses steam to produce mechanical work while steam turbine uses steam to produce electrical power.

• Difference between steam engine and steam turbine is that steam engine is an external combustion...read more

System configuration refers to the process of setting up and arranging hardware and software components to work together efficiently.

• System configuration involves setting up hardware and software components to work together efficiently

• It includes configuring network settings, installing drivers, and setting up user accounts

• Examples of system configuration tools include Microsoft System Center Configuration Manager and Puppet

• Proper system configuration is essential for optimal...read more

The most complex structure I have designed is a multi-story commercial building.

• Designed a multi-story commercial building with complex structural requirements

• Incorporated features such as elevators, staircases, and HVAC systems

• Ensured compliance with local building codes and safety regulations

• Collaborated with architects, engineers, and contractors to ensure successful completion

Short circuit doesn't happen between conductor and pole while raining due to the insulating properties of rainwater.

• Rainwater is a poor conductor of electricity

• It acts as an insulator between the conductor and pole

• The insulating properties of rainwater prevent the flow of current and thus short circuit is avoided

Components can interact in Angular through input and output bindings.

• Input bindings allow a parent component to pass data to a child component.

• Output bindings allow a child component to emit events to a parent component.

• Components can also communicate through a shared service or using @ViewChild and @ContentChild decorators.

A dead short wiring installation will have a megger reading of zero.

• A dead short is a complete circuit with no resistance.

• A megger is used to measure insulation resistance.

• In a dead short, there is no insulation resistance to measure.

• Therefore, the megger reading will be zero.

The VPN port used for UDP is typically 500.

• The VPN port used for UDP is usually port 500.

• UDP is a protocol that allows for faster transmission of data but does not guarantee delivery or order of packets.

• Port 500 is commonly used for IPsec VPNs, which provide secure communication over the internet.

• Other VPN protocols may use different ports for UDP, so it's important to check the specific configuration.

Section 40-B of the Factories Act, 1948 refers to Safety Officer in factory.

• Section 40-B of the Factories Act, 1948 deals with the appointment of Safety Officers in factories.

• The section mandates that factories employing 1,000 or more workers or those engaged in hazardous processes must appoint a Safety Officer.

• The Safety Officer is responsible for ensuring compliance with safety regulations and promoting a safe working environment.

• The section also outlines the qualifications...read more

UNIX is a powerful and versatile operating system known for its stability, security, and scalability.

• UNIX is a multi-user and multi-tasking operating system.

• It provides a command-line interface for users to interact with the system.

• UNIX is known for its robustness and reliability.

• It supports networking and is widely used in server environments.

• Examples of UNIX-based operating systems include Linux, macOS, and Solaris.

The layers in the ISO OSI model are Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Physical layer: Deals with the physical transmission of data.

• Data Link layer: Provides error-free transmission over a physical link.

• Network layer: Handles routing and forwarding of data packets.

• Transport layer: Ensures reliable delivery of data between hosts.

• Session layer: Establishes, manages, and terminates sessions between applications.

• Presentation layer: Tra...read more

BIL is the voltage level that insulation in a device can withstand. First pole to clear factor is the time taken by the first pole of a circuit breaker to clear a fault.

• BIL is a measure of insulation strength in electrical devices

• It indicates the maximum voltage that the insulation can withstand without breaking down

• First pole to clear factor is the time taken by the first pole of a circuit breaker to clear a fault

• It is an important factor in determining the overall clearing ...read more

Emergency brake distance calculation for a locomotive.

• Determine the speed of the locomotive

• Find the deceleration rate of the locomotive

• Calculate the stopping distance using the formula: (speed^2) / (2 x deceleration rate)

• Consider factors such as track conditions and weather

• Perform regular maintenance to ensure brakes are functioning properly

var is function-scoped and let is block-scoped.

• var declarations are hoisted to the top of their scope, while let declarations are not.

• var can be redeclared in the same scope, while let cannot.

• let variables are not accessible before they are declared, while var variables are.

• let variables have a temporal dead zone, while var variables do not.

• let is recommended for use in modern JavaScript.

Inventory turn ratio is a financial metric that measures how many times a company's inventory is sold and replaced over a period of time.

• It is calculated by dividing the cost of goods sold by the average inventory value.

• A high inventory turn ratio indicates efficient inventory management and sales, while a low ratio may indicate overstocking or poor sales.

• It is important for demand planners to monitor inventory turn ratio to ensure optimal inventory levels and avoid stockouts...read more

Soft starters are preferred over star-delta starters for motor start and run due to their ability to reduce inrush current and provide smoother acceleration.

• Soft starters provide a gradual increase in voltage to the motor, reducing inrush current and mechanical stress on the motor.

• Star-delta starters provide a sudden increase in voltage, resulting in high inrush current and mechanical stress on the motor.

• Soft starters also provide smoother acceleration and deceleration, reduc...read more

The windmill manufacturer in Scandinavia is facing labor pool shortage and needs to expand.

• The manufacturer can consider outsourcing labor from other countries.

• They can also invest in training programs to develop local talent.

• The manufacturer can offer incentives to attract skilled workers to relocate.

• They can also consider automating some of their processes to reduce the need for labor.

• The manufacturer can partner with local universities to recruit graduates with relevant sk...read more

Pre and post fix operators are used to increment or decrement a value before or after it is used in an expression.

• Pre-fix operator (++x) increments the value of x and returns the new value.

• Post-fix operator (x++) returns the value of x and then increments it.

• Both operators can be used with variables of numeric data types.

• They can also be used with pointers to increment or decrement the memory address they point to.

A substation is an electrical system that transforms voltage from high to low or vice versa for transmission and distribution.

• Substation is a part of an electrical generation, transmission, and distribution system.

• It is used to transform voltage from high to low or vice versa for transmission and distribution.

• Substation consists of various equipment's such as transformers, circuit breakers, busbars, isolators, lightning arresters, etc.

• Transformers are used to step up or step ...read more

App life cycle refers to the stages an application goes through from installation to removal.

• App is installed on a device

• App is launched and runs

• App goes into background when not in use

• App may be terminated by the user or system

• App data may be cleared or app uninstalled

Split a linked list into even and odd without changing order.

• Create two new linked lists for even and odd numbers.

• Iterate through the original linked list and append nodes to respective even or odd lists.

• Finally, merge the even and odd lists to get the desired result.

GIS stands for Geographic Information System. Live tank and dead tank CB are types of circuit breakers used in power systems.

• GIS is a system that captures, stores, analyzes and manages spatial or geographic data.

• Live tank CB is a type of circuit breaker where the interrupter is housed in an insulating gas-filled tank and the contacts are in the open air.

• Dead tank CB is a type of circuit breaker where the interrupter is housed in a grounded metal enclosure and the contacts are...read more

Yes, cloud computing refers to the delivery of computing services over the internet.

• Cloud computing allows users to access data and applications from anywhere with an internet connection.

• It offers scalability, flexibility, and cost-effectiveness compared to traditional on-premises computing.

• Examples of cloud computing services include Amazon Web Services, Microsoft Azure, and Google Cloud Platform.

Strain is the measure of deformation in a material due to applied stress.

• Strain is a dimensionless quantity that represents the ratio of the change in length or shape of a material to its original length or shape.

• It is typically expressed as a percentage or in microstrain (με).

• Strain can be caused by tensile, compressive, or shear stress.

• In a cantilever beam, the SFD (Shear Force Diagram) will show a constant positive shear force along the length of the beam, while the BMD (B...read more

The brake system architecture for locomotives includes air brakes, mechanical brakes, and electronic brakes.

• Air brakes use compressed air to apply and release brakes

• Mechanical brakes use friction to slow down or stop the train

• Electronic brakes use sensors and computer systems to control the braking process

• The brake system also includes brake shoes, brake discs, brake pads, and brake calipers

• The brake system is designed to provide redundancy and fail-safe operation

The project is a web application for managing inventory in a retail store.

• The project involves creating a database schema for storing product information, customer details, and sales data.

• The code includes CRUD operations for managing products, customers, and sales transactions.

• Industry level parameters used include encryption for sensitive data, input validation to prevent SQL injection, and role-based access control.

• Example: Encryption of customer credit card information to...read more

Logic for PLC software

• Define inputs and outputs

• Create ladder logic diagram

• Test and debug program

Validation processes in Railway Industries ensure that systems and components meet safety and performance standards.

• Validation involves testing and verifying systems, components, and processes to ensure they meet regulatory requirements.

• Validation may include functional testing, performance testing, and safety testing.

• Examples of validation processes in Railway Industries include testing signaling systems, brakes, and communication systems.

• Validation also involves documentati...read more

Thermo-acoustic instabilities are oscillations in gas turbines caused by the interaction between combustion and acoustics.

• Occurs when the heat release rate and the acoustic modes of the combustor are coupled

• Can lead to high-amplitude pressure oscillations that can damage the turbine

• Can be mitigated by altering the geometry of the combustor or by using active control methods

• Examples include the Helmholtz resonator and the Rijke tube

Type B MCBs are suitable for halogen lamps.

• Type B MCBs have a characteristic curve that allows for a short-term surge in current, which is common in halogen lamps.

• Type C and D MCBs may trip too quickly and cause nuisance tripping.

• It is important to check the wattage and voltage of the halogen lamp to ensure the correct MCB is selected.

• Examples of Type B MCBs include Schneider Electric Acti 9 iK60N and ABB S 200 series.

Stress is the internal resistance experienced by a material when subjected to external forces. Bending Moment Diagram is a graphical representation of the variation of bending moment along the length of a beam.

• Stress is the force per unit area experienced by a material.

• It is caused by external forces acting on a material.

• Stress can be tensile (stretching), compressive (squeezing), or shear (sliding).

• Bending Moment Diagram shows the variation of bending moment along the length...read more

An inverter is a device that converts direct current (DC) to alternating current (AC).

• Inverters are commonly used in solar power systems to convert DC power from solar panels to AC power for use in homes and businesses.

• There are three main types of inverters: square wave, modified sine wave, and pure sine wave.

• Square wave inverters are the simplest and least expensive, but they produce a choppy output waveform that may not be suitable for all devices.

• Modified sine wave invert...read more

XUnit and NUnit are both unit testing frameworks for .NET, with XUnit being newer and more extensible.

• XUnit is newer and more extensible compared to NUnit

• XUnit uses attributes for test methods while NUnit uses attributes for test fixtures

• XUnit does not support TestFixtureSetUp and TestFixtureTearDown like NUnit

• XUnit has better support for parallel testing compared to NUnit

The string data type in many programming languages is immutable, meaning it cannot be changed after it is created. Therefore, a reverse method is not provided.

• String objects are typically implemented as arrays of characters, and reversing an array in-place is a complex operation.

• To reverse a string, one can convert it to an array, reverse the array, and then convert it back to a string.

• Alternatively, one can use a loop to iterate through the characters of the string in revers...read more

Spring is a Java framework for building enterprise-level applications. Spring Boot is a tool for quickly building Spring-based applications.

• Spring provides a comprehensive programming and configuration model for modern Java-based enterprise applications.

• Spring Boot is an opinionated framework that simplifies the Spring application development process.

• Spring MVC is a web framework built on top of the Spring framework.

• Microservices is an architectural style that structures an a...read more

The difference between == and === is that == compares the values of two variables, while === compares both the values and the data types.

• The == operator performs type coercion, meaning it converts the operands to a common type before comparison.

• The === operator does not perform type coercion and requires both the values and the data types to be the same for a true comparison.

• For example, 1 == '1' returns true because the operands are coerced to the same type (number), but 1 =...read more

Relay is an electrically operated switch that opens or closes circuits electronically.

• Relays are used to control high voltage circuits with low voltage signals.

• They are used in automation systems, power plants, and automobiles.

• Examples include electromagnetic relays, solid-state relays, and thermal relays.

Surge arrestors protect electrical equipment from voltage spikes and surges.

• Surge arrestors are devices that limit the voltage supplied to electrical equipment during a surge or spike.

• They protect equipment from damage caused by overvoltage.

• Surge arrestors are commonly used in power distribution systems, telecommunications networks, and electronic equipment.

• They work by diverting excess voltage to the ground, preventing it from reaching the equipment.

• Surge arrestors can be in...read more

The earthing port of a wire is thicker than live and neutral to ensure safety and provide a low-resistance path for fault currents.

• Earthing is essential to protect against electric shock and to prevent damage to electrical equipment.

• Thicker earthing wire reduces resistance and allows fault currents to flow easily, facilitating the operation of protective devices like circuit breakers.

• The larger cross-sectional area of the earthing wire helps dissipate heat generated during fa...read more

The challenge in designing and site activity is ensuring that the design is practical and can be successfully implemented on site.

• Ensuring that the design meets all technical requirements and specifications

• Coordinating with various teams involved in the project to ensure smooth execution

• Managing unexpected challenges that may arise during the erection and commissioning process

• Adapting the design if necessary to overcome site constraints

• Ensuring compliance with safety regulati...read more

The number of zeros in the factorial of n depends on the number of factors of 5 in n!

• Count the number of factors of 5 in n! to determine the number of zeros

• For example, in 10! = 10 x 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1, there is one factor of 5, so there is one zero at the end

To change the odd bits in a binary number, flip the bits at odd positions and convert the new binary number to decimal form.

• Start by converting the given number into binary form.

• Identify the odd bits in the binary number (counting from right to left, starting at 1).

• Flip the odd bits by changing 1s to 0s and 0s to 1s.

• Convert the new binary number into decimal form.

• For example, if the given number is 13 (binary 1101), the odd bits are at positions 1 and 3. Flipping them gives 1...read more

To design schematic and layout using Altium tool, start by creating a new project and selecting the appropriate components.

• Create a new project in Altium

• Select the appropriate components for the design

• Place the components on the schematic

• Connect the components using wires and buses

• Run design rule checks to ensure the design meets specifications

• Create the layout by placing the components on the PCB

• Route the connections between the components

• Run design rule checks on the layout...read more

A relay is an electrically operated switch that uses an electromagnet to mechanically open or close a circuit.

• Relays are commonly used in control circuits to switch high voltage or current using a low voltage signal.

• They can be used to control motors, lights, and other electrical devices.

• Relays can be classified based on their construction, contact configuration, and operating voltage.

• Examples of relays include electromagnetic relays, solid-state relays, and thermal relays.

The virtual ground concept is a technique used in electronics to create a reference point at a voltage level that is virtually equal to ground.

• The virtual ground concept is commonly used in operational amplifier circuits.

• It is achieved by using negative feedback to maintain the voltage at a specific node close to ground potential.

• This technique allows for easier analysis and design of circuits.

• For example, in an inverting amplifier circuit, the virtual ground is created at th...read more

To remove duplicate variables in a string

• Iterate through the string and keep track of each character

• If a character is already encountered, skip it

• Create a new string with non-duplicate characters

Dangerous Occurrence as per Fact Act refers to any incident that results in serious injury, death, or significant damage to property.

• Dangerous Occurrence includes incidents that result in serious injury or death of a person.

• It also includes incidents that cause significant damage to property or the environment.

• Criteria for determining Dangerous Occurrence may vary based on the specific regulations or guidelines outlined in the Fact Act.

• Examples of Dangerous Occurrences includ...read more

Answering two technical questions asked in a Graduate Engineer Trainee interview.

• To swap two numbers, we can use a temporary variable or arithmetic operations.

• To find the sum of diagonals of a matrix, we can use a loop to iterate through the rows and columns.

• For a square matrix, the sum of the main diagonal is the sum of elements at (i, i) position and the sum of the secondary diagonal is the sum of elements at (i, n-i-1) position.

A contactor is an electrical device used to control the flow of electricity in a circuit.

• Contactor is used to switch on and off electrical power to a load.

• It is commonly used in motor control circuits to control the operation of motors.

• Contactor helps in protecting electrical circuits from overload or short circuits.

• It provides a safe and reliable method of controlling high-power electrical loads.

• Contactor can be manually operated or controlled by an automatic control system....read more

Syntax for grep command and regex

• grep [options] pattern [file]

• Regular expression (regex) is used to define the pattern

• Examples: grep 'hello' file.txt

• grep -i 'hello' file.txt

• grep -r 'hello' /path/to/directory

STLC is a subset of SDLC that focuses on testing activities.

• SDLC is the overall process of software development from planning to deployment.

• STLC is a subset of SDLC that focuses on testing activities.

• SDLC includes requirements gathering, design, coding, testing, and deployment.

• STLC includes test planning, test design, test execution, and test closure.

• SDLC is a broader term that encompasses STLC.

To check motor conditions, perform visual inspection, measure voltage and current, check for abnormal noises, and test motor performance.

• Perform a visual inspection to check for any physical damage or loose connections.

• Measure the voltage and current using a multimeter to ensure they are within the specified range.

• Listen for any abnormal noises such as grinding or squealing that may indicate motor issues.

• Test the motor performance by running it under load and checking for any...read more

Test automation framework is a set of guidelines, standards, and tools used for automating software testing.

• It helps in reducing manual testing efforts and increases test coverage.

• It provides a structured approach to test automation.

• It includes tools for test case management, test data management, and test execution.

• It supports various programming languages and testing frameworks.

• Examples include Selenium, Appium, TestNG, JUnit, and Cucumber.

I have extensive work experience in electrical commissioning, including troubleshooting, testing, and ensuring compliance with safety regulations.

• Experience in conducting electrical tests and inspections

• Knowledge of electrical systems and components

• Ability to troubleshoot and resolve issues efficiently

• Familiarity with safety regulations and protocols

• Experience in working with various stakeholders to ensure successful commissioning

Calculate mills roller thrust by considering the load on the rollers and the angle of contact.

• Calculate the load on the rollers by considering the weight of the material being processed and any additional forces acting on the rollers.

• Determine the angle of contact between the rollers and the material being processed.

• Use the formula: Roller Thrust = Load on Rollers * tan(Angle of Contact).

• Ensure to consider all relevant factors affecting the roller thrust in your plant.

Pseudo elements/children are CSS selectors that target specific parts of an element.

• Pseudo elements are denoted by a double colon (::) and are used to style a specific part of an element, such as the first letter or line of text.

• Pseudo children are denoted by a single colon (:), and are used to select a specific state of an element, such as when it is being hovered over or clicked.

• Examples of pseudo elements include ::before and ::after, which add content before or after an e...read more

To implement a Full stack application in 20 minutes, take two inputs from the input box and output their multiplication from the backend.

• Use a front-end framework like React or Angular to create the input boxes for user input.

• Create an API endpoint in the backend using Node.js or Django to receive the input values and perform the multiplication operation.

• Return the result back to the front-end to display to the user.

• Ensure proper error handling and validation for input values...read more

Yes, application software for power quality and energy metering monitoring works effectively.

• Application software can effectively monitor power quality and energy metering data

• These software can provide real-time data analysis and reporting

• Examples include Power Monitoring Software, Energy Management Software, and Smart Metering Software

Topologies and protocols used in networking

• Topologies: Bus, Star, Ring, Mesh, Hybrid

• Protocols: TCP/IP, HTTP, FTP, SMTP, DNS

• Ethernet, Wi-Fi, Bluetooth are common networking technologies

• Network security protocols: SSL, TLS, IPSec

• Routing protocols: OSPF, BGP, RIP

Earthing switch is a safety device used in GIS/AIS to ground the equipment during maintenance or fault conditions.

• Earthing switch is used to discharge any residual voltage in the equipment before maintenance.

• It is also used to ground the equipment during fault conditions to protect the personnel and equipment.

• Earthing switch is usually operated manually or automatically by the protection system.

• In GIS, earthing switch is located between the busbar and the circuit breaker.

• In A...read more

CT & VT are used in GIS/AIS for measuring current and voltage respectively.

• CT (Current Transformer) is used to measure high current levels and step down the current to a level that can be measured by instruments.

• VT (Voltage Transformer) is used to measure high voltage levels and step down the voltage to a level that can be measured by instruments.

• GIS (Gas Insulated Switchgear) and AIS (Air Insulated Switchgear) both use CTs and VTs for protection and measurement purposes.

• CTs ...read more

Insertion Sort is a simple sorting algorithm that builds the final sorted array one item at a time.

• Start from the second element and compare it with the previous elements to find its correct position in the sorted array.

• Repeat this process for all elements in the array.

• Example: Given array of strings ['banana', 'apple', 'orange'], after insertion sort it becomes ['apple', 'banana', 'orange'].

Scalance type selection is based on factors like network size, speed requirements, and redundancy needs.

• Consider the size of the network to determine the number of ports needed

• Evaluate the speed requirements to choose between Fast Ethernet or Gigabit Ethernet

• Assess the redundancy needs to decide on features like ring redundancy or port redundancy

• Examples: Scalance X-200 for small networks, Scalance X-400 for larger networks

LEAN Manufacturing is a systematic method for eliminating waste within a manufacturing process to improve efficiency and quality.

• Focuses on continuous improvement

• Eliminates waste in all forms (time, resources, etc.)

• Involves all employees in the process

• Uses tools like 5S, Kanban, and Value Stream Mapping

• Aims to increase efficiency, reduce costs, and improve quality

STLC is a process followed for testing software applications, while SDLC is a broader process that encompasses the entire software development lifecycle.

• STLC stands for Software Testing Life Cycle.

• It includes activities like test planning, test design, test execution, and test closure.

• STLC ensures that the software meets quality standards and is bug-free.

• SDLC stands for Software Development Life Cycle.

• It includes phases like requirements gathering, design, development, testin...read more

An encoder is a device that converts motion into an electrical signal. A proxy is a server that acts as an intermediary for requests from clients.

• Encoders are used in various applications such as robotics, automation, and CNC machines.

• Proxies are commonly used in computer networks to improve security and performance.

• An example of an encoder is a rotary encoder that converts the rotational motion of a shaft into an electrical signal.

• An example of a proxy is a web proxy that ca...read more

ListView control is a graphical control element used to display a list of items in a vertical, scrollable view.

• Used in GUI applications to display a list of items

• Allows users to scroll through the list

• Can be customized with different layouts and styles

• Commonly used in mobile apps and desktop applications