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20+ Automattic Interview Questions and Answers

Updated 9 Dec 2024

Q1. Noise, Vibration, and Harshness (NVH) in gearboxes are influenced by several factors, which can broadly be categorized into design, material, manufacturing, and operational factors. Here are some key factors af...

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Ans.

Addressing NVH in gearboxes involves optimizing design, material, manufacturing, and operational factors.

  • Optimizing gear geometry like tooth profile and helix angle can reduce noise.

  • Proper material quality and heat treatment can minimize vibrations.

  • Precision machining and assembly quality are crucial for reducing NVH.

  • Consider load conditions, lubrication, and operational speed for NVH control.

  • Environmental factors like temperature and external vibrations also impact gearbox N...read more

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Q2. Can Copy constructor be private

Ans.

Yes, it can be made private to prevent copying of objects.

  • Making copy constructor private can prevent copying of objects.

  • It can be useful in singleton classes where only one instance is allowed.

  • It can also be used to prevent copying of objects with sensitive data.

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Q3. illustrate project using an example

Ans.

Developed a mobile app for tracking daily water intake

  • Used React Native for cross-platform development

  • Integrated with Apple HealthKit and Google Fit APIs

  • Implemented push notifications to remind users to drink water

  • Incorporated gamification elements to encourage consistent usage

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Q4. What is difference between c and embedded c

Ans.

C is a general-purpose programming language while Embedded C is a subset of C used for programming microcontrollers and other embedded systems.

  • Embedded C has limited resources compared to C

  • Embedded C has specific libraries for hardware access

  • Embedded C has specific memory models

  • Embedded C has specific coding standards for safety-critical systems

  • C can be used for a wide range of applications while Embedded C is specific to embedded systems

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Q5. C programs regarding bitwise operation

Ans.

Bitwise operations in C programs are used to manipulate individual bits within a byte or word.

  • Use bitwise AND (&), OR (|), XOR (^), left shift (<<), and right shift (>>) operators.

  • Example: x = x & 0x0F; // Clear upper 4 bits of x

  • Example: y = y | 0x80; // Set the 7th bit of y

  • Example: z = z ^ 0x01; // Toggle the least significant bit of z

  • Example: a = a << 2; // Left shift a by 2 bits

  • Example: b = b >> 3; // Right shift b by 3 bits

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Q6. Comstack explanation

Ans.

Comstack is a communication stack used in embedded systems for handling communication protocols.

  • Comstack is a software component that manages communication protocols in embedded systems.

  • It provides a standardized way for different components to communicate with each other.

  • Comstack can handle various communication protocols such as CAN, LIN, FlexRay, etc.

  • It abstracts the low-level details of communication protocols from the application layer.

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Q7. How ABS works? ( In general)

Ans.

ABS (Anti-lock Braking System) is a safety feature in vehicles that prevents wheels from locking up during braking.

  • ABS uses sensors to monitor wheel speed and prevent wheel lock-up.

  • When the system detects wheel lock-up, it modulates brake pressure to individual wheels.

  • This allows the driver to maintain steering control and reduce stopping distance.

  • ABS is particularly useful in emergency braking situations or on slippery surfaces.

  • Examples of ABS-equipped vehicles include cars,...read more

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Q8. Who are the Chief Execs of ZF? and Any recent developments in the Company

Ans.

The Chief Executives of ZF are Wolf-Henning Scheider and Konstantin Sauer. Recent developments include the acquisition of WABCO Holdings Inc.

  • Chief Executives: Wolf-Henning Scheider and Konstantin Sauer

  • Recent development: Acquisition of WABCO Holdings Inc.

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Q9. What are deadlocks

Ans.

Deadlocks are situations in which two or more processes are unable to proceed because each is waiting for the other to release a resource.

  • Deadlocks occur in multitasking environments where processes compete for limited resources.

  • Four conditions must hold for a deadlock to occur: mutual exclusion, hold and wait, no preemption, and circular wait.

  • Example: Process A holds Resource 1 and waits for Resource 2, while Process B holds Resource 2 and waits for Resource 1.

  • Deadlocks can ...read more

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Q10. What are factore that affecting the NVH

Ans.

Factors affecting NVH include vehicle design, materials used, engine type, and road conditions.

  • Vehicle design: Shape, size, weight distribution

  • Materials used: Quality of materials, insulation

  • Engine type: Number of cylinders, power output

  • Road conditions: Smoothness, tire type

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Q11. What is debouncing

Ans.

Debouncing is a technique used in software development to prevent multiple rapid triggers of an event.

  • Debouncing helps in filtering out unnecessary or duplicate events that occur in quick succession.

  • It is commonly used in user interface interactions like button clicks to ensure a single action is triggered.

  • Debouncing involves setting a time threshold during which any subsequent triggers are ignored.

  • Example: Preventing multiple form submissions on a website by debouncing the s...read more

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Q12. Explain embedded systems

Ans.

Embedded systems are specialized computing systems designed to perform specific tasks within a larger system.

  • Embedded systems are typically found in everyday devices such as smartphones, cars, and household appliances.

  • They are designed to be efficient, reliable, and often operate in real-time.

  • Embedded systems often have limited resources such as memory and processing power.

  • Examples of embedded systems include microcontrollers in a washing machine, GPS systems in cars, and fir...read more

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Q13. Structure Union difference

Ans.

Structure is a user-defined data type that groups related variables under one name, while union allows multiple variables to be stored in the same memory location.

  • Structure allocates memory for all its members separately, while union shares the same memory location for all its members.

  • Structures are used when all members need to be accessed independently, while unions are used when only one member needs to be accessed at a time.

  • Example: struct Person { char name[50]; int age;...read more

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Q14. Would you sell your product

Ans.

Yes, I would sell the product to generate revenue and reach a wider audience.

  • Selling the product can help generate revenue for further development and growth.

  • Selling the product can help reach a wider audience and increase market presence.

  • Examples: Microsoft selling Windows operating system, Adobe selling Photoshop software.

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Q15. How to much expected CTC

Ans.

Expected CTC should be based on industry standards and candidate's experience.

  • Research industry standards for the position

  • Consider candidate's experience and qualifications

  • Factor in location and cost of living

  • Be open to negotiation

  • Example: For a software engineer position in Bangalore, the expected CTC could range from 8-15 lakhs per annum depending on experience and company size.

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Q16. What is PPM and how it is calculated ?

Ans.

PPM stands for Parts Per Million and is a measurement used to quantify very low concentrations of substances in a mixture.

  • PPM is calculated by dividing the mass of the solute by the total mass of the solution and multiplying by one million.

  • For example, if a solution contains 2 grams of solute in 1000 grams of solution, the PPM would be 2000.

  • PPM is commonly used in fields such as chemistry, environmental science, and manufacturing to measure the concentration of pollutants or ...read more

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Q17. What do you know about ZF?

Ans.

ZF is a global technology company that specializes in driveline and chassis technology as well as active and passive safety technology.

  • ZF is a leading global technology company in the automotive industry.

  • They specialize in driveline and chassis technology, as well as active and passive safety technology.

  • ZF produces transmissions, steering systems, axles, and other components for vehicles.

  • The company is known for its innovative solutions and commitment to sustainability.

  • ZF has...read more

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Q18. How do you calculate OEE ?

Ans.

OEE is calculated by multiplying Availability, Performance, and Quality percentages.

  • Calculate Availability: (Operating Time / Planned Production Time) x 100%

  • Calculate Performance: (Ideal Cycle Time x Total Count) / Operating Time x 100%

  • Calculate Quality: Good Count / Total Count x 100%

  • Multiply Availability, Performance, and Quality percentages to get OEE

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Q19. What do you know about the V cycle

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Q20. Hyper parameters of different DL algos.

Ans.

Hyperparameters are settings that are external to the model and are used to control the learning process of deep learning algorithms.

  • Hyperparameters for neural networks include learning rate, batch size, number of layers, number of neurons per layer, activation functions, and dropout rate.

  • For example, in a convolutional neural network, hyperparameters may include filter size, stride, and padding.

  • Hyperparameters can be tuned using techniques like grid search, random search, an...read more

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Q21. Discuss hypothesis testing in detail.

Ans.

Hypothesis testing is a statistical method used to make inferences about a population based on sample data.

  • Hypothesis testing involves formulating a null hypothesis and an alternative hypothesis.

  • The null hypothesis assumes that there is no significant difference or relationship between variables, while the alternative hypothesis suggests otherwise.

  • A significance level (alpha) is chosen to determine the threshold for rejecting the null hypothesis.

  • Statistical tests such as t-te...read more

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Q22. Creo commands used in general

Ans.

Creo commands are used for designing and modeling in the mechanical engineering field.

  • Extrude: Used to create a 3D feature by extruding a 2D sketch

  • Revolve: Used to create a 3D feature by revolving a 2D sketch around an axis

  • Sweep: Used to create a 3D feature by sweeping a 2D sketch along a path

  • Blend: Used to create a smooth transition between two or more features

  • Pattern: Used to create multiple instances of a feature in a pattern

  • Shell: Used to hollow out a solid feature

  • Draft: ...read more

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