Find Interview Questions for Techmill

Right Answer:
Promises in JavaScript are objects that represent the eventual completion (or failure) of an asynchronous operation and its resulting value. They allow you to handle asynchronous code more easily by providing methods like `.then()` for success and `.catch()` for errors.

`async` and `await` are syntactic sugar built on top of promises. An `async` function always returns a promise, and within an `async` function, you can use `await` to pause execution until a promise is resolved, making the code easier to read and write as if it were synchronous.

Right Answer:
An API Gateway acts as a single entry point for clients to access multiple microservices, handling requests, routing them to the appropriate services, managing authentication, rate limiting, and aggregating responses.

Right Answer:
Rate limiting in APIs is a technique used to control the number of requests a user can make to an API within a specific time period. It is implemented by setting thresholds (e.g., requests per minute) and using mechanisms like tokens, counters, or IP address tracking to monitor and restrict access when the limit is exceeded.

Right Answer:
An API (Application Programming Interface) is a set of rules and protocols that allows different software applications to communicate with each other. It defines the methods and data formats that applications can use to request and exchange information. APIs work by sending requests from one application to another, which then processes the request and sends back a response.

Right Answer:
An API endpoint is a specific URL or URI where an API can be accessed by a client to perform operations like retrieving or sending data. It defines the location and method (such as GET, POST) for interacting with the API.

Right Answer:
CORS, or Cross-Origin Resource Sharing, is a security feature implemented by web browsers that allows or restricts web applications from making requests to a domain different from the one that served the web page. It affects API development by requiring developers to configure their APIs to specify which origins are allowed to access their resources, ensuring that only trusted domains can interact with the API.

Right Answer:
Requirements Traceability is the process of tracking and linking requirements throughout the project lifecycle to ensure that all requirements are met in the final product. The purpose of it is to ensure that all requirements are accounted for, validated, and tested, helping to manage changes and ensure quality.

Types of traceability matrices include:

1. **Forward Traceability**: Tracks requirements to their corresponding design, implementation, and testing artifacts.
2. **Backward Traceability**: Ensures that each test case can be traced back to the original requirement.
3. **Bi-directional Traceability**: Combines both forward and backward traceability to ensure comprehensive coverage and validation of requirements.

Right Answer:
A risk register is a document that lists identified risks for a project, along with their assessment, mitigation strategies, and status. It helps project managers track and manage risks throughout the project lifecycle.

Right Answer:
I inform all stakeholders of the project's progress through regular status reports, scheduled meetings, and updates via email or project management tools. This ensures everyone is aligned and aware of any changes or issues.

Right Answer:
Project selection methods are techniques used to evaluate and choose projects based on their potential value and alignment with organizational goals. Common methods include:

1. **Cost-Benefit Analysis**: Comparing the expected costs and benefits of a project to determine its feasibility.
2. **Scoring Models**: Assigning scores to projects based on predefined criteria to rank them.
3. **Payback Period**: Calculating the time it takes to recover the initial investment from the project's cash flows.
4. **Net Present Value (NPV)**: Assessing the profitability of a project by calculating the difference between the present value of cash inflows and outflows.
5. **Internal Rate of Return (IRR)**: Determining the discount rate that makes the NPV of a project zero, indicating its potential return.
6. **Portfolio Analysis**: Evaluating projects as part of a larger portfolio to balance risk and return.
7. **Expert Judgment**: Relying on the insights of experienced stakeholders

Right Answer:
RPI (Requested Packet Interval) is the time interval at which a device sends data on a ControlNet network, while NUT (Network Update Time) is the maximum time allowed for the network to update all devices. If you increase the NUT, it can lead to longer delays in data updates across the network, potentially affecting real-time performance and responsiveness.

Right Answer:
Sensors are devices that detect and respond to physical stimuli, such as temperature, pressure, or light, and convert that information into signals. Transducers, on the other hand, are devices that convert one form of energy into another.

For example, a temperature sensor measures temperature and produces an electrical signal (sensor), while a thermocouple converts temperature differences into a voltage (transducer).