ABB

Engineering context

ABB develops electrification and automation technology. Relevant electronics foundations include measurement, control systems, drives interfaces and embedded implementation; verify the specific business and role in the vacancy. Official company reference.

Selection process

Use the current vacancy, official hiring communication and assessment instructions. Eligibility, tests, interview count and topics vary by role, location and hiring route; this guide does not verify a fixed sequence of company interview rounds.

What to revise

Control loops, sensors, signal conditioning, motor-drive interfaces and industrial communication.

Use the relevant subjects below as references; you do not need to revise every subject equally for every role.

• Networks & Circuits
• Signals & Systems
• Electronic Devices
• Analog Circuits
• Digital Circuits
• Control Systems
• Communications
• Electromagnetics
• Microprocessors & Embedded
• VLSI Design

Practice questions

These are original preparation questions, not a claim that the company asked them.

1. Explain the working principle of a transformer. A transformer operates on the principle of electromagnetic induction and is used to change the voltage levels in an AC circuit. It consists of primary and secondary windings, and the voltage is transformed based on the turns ratio between these windings.

2. What is the difference between analog and digital signals? Analog information varies continuously in amplitude; digital information uses discrete symbols. Physical digital waveforms are still continuous-time electrical signals, and noise immunity depends on margins, coding and the receiver.

3. How do microcontrollers differ from microprocessors? Microcontrollers are compact integrated circuits designed to govern a specific operation in an embedded system, often including memory and peripherals. A microprocessor emphasizes CPU processing, while a microcontroller typically integrates memory and control peripherals. Modern system-on-chip devices blur the distinction; inspect the actual device architecture.

4. What is modulation and why is it used in communication systems? Modulation is the process of varying a carrier signal in order to transmit data. It is used in communication systems to allow the transmission of signals over long distances, to multiplex multiple signals, and to match the frequency range of the transmission medium.

5. Describe the function of a rectifier. A rectifier converts alternating current (AC) to direct current (DC). It is commonly used in power supplies for electronic devices, allowing them to operate on DC power derived from an AC source.

6. What are the key components of a control system? A control system typically consists of sensors, controllers, actuators, and feedback mechanisms. These components work together to maintain the desired output of a system by adjusting inputs based on feedback.

Before the interview

• Review your academic projects and be prepared to discuss your role and the technologies used.
• Reflect on any internships or practical experiences, focusing on what you learned and how it applies to the role.
• Research ABB's recent projects, technological advancements, and industry impact to demonstrate your interest and knowledge about the company.
• Prepare questions to ask the interviewer about the company culture, team dynamics, and potential career paths within ABB.