PRDC had come to our college for placements that year, and I am given to understand that they have been coming ever since. There were 7 rounds in all between February 2017 and May 2017.
Round 1 (February 20th, 2017): An online test conducted on the college campus consisting of 90 questions (most of them being objective type and few being subjective type) to be answered in 90 minutes. There were 3 sections - Electrical Power Systems, General Aptitude and English.
I don't know the cut-off for this round, but I was the only fellow from my college to get through.
Round 2 (March 24th, 2017): This was a telephonic interview which went on for about 18 minutes. The candidate's understanding of the fundamentals of Electrical Engineering (Power Systems and Switchgear in particular) will be tested in this round. There will also be questions on the candidate's final year project. Thorough knowledge of final year project will give you an edge in this round, even more so if it is based on Power Systems/Switchgear. From what I learnt post-joining, most candidates get through this round.
Rounds 3 to 7 were on May 18th, 2017 at the company's Bangalore office. People who get through rounds 1 and 2 will be called for the Bangalore round in batches of 10-15 people. Before the start of the interview process, candidates will be asked to fill out a form with their basic details, professional goals, strengths and weaknesses, and job particulars like expected notice period, expected salary, expected duration of service in the company etc.
Round 3: There were 3 subjective questions/problems in this round. The questions generally asked here are on core Power Systems topics such as Electrical Machines, Transmission and Distribution, Switchgear, Power System Stability etc. Candidates do not get eliminated in this round.
Round 4: This is a face-to-face interview with a panel consisting of two people, a technical person and an HR Manager. The technical fellow will cross-question the candidate on the answers given to the subjective questions in Round 3. There will also be questions on the final year project and also on various core Power System topics. The HR Manager will ask typical "HR questions" and also a few logical puzzles. Based on the candidate's resume/interests, the HR Manager will ask if the candidate is willing to work in a Software role. It is worth noting here that most candidates will prefer a Power Systems Engineer role over a Software role. 80% to 90% of the candidates get eliminated in this round. Those who clear this round are invariably offered a job. The remaining rounds are a mere rubber stamp.
Round 5 (Optional): This is a face-to-face interview which is only for those candidates who express interest in a Software role in Round 4. The questions will be on C/C++ or Java depending on project requirements. Candidates who appear for this round and fare badly will not be eliminated. They may not be given a Software role if and when they join the company, and will have to take-up a Power Systems Engineer role instead.
Round 6: This is a face-to-face interview with General Manager-HR. Typical HR questions will be asked. The questions asked will be condescending and almost provocative. Just play diplomatic and you will sail through.
Round 7: This is a face-to-face interview with the company's Managing Director, who is very knowledgeable and vastly experienced in the field of Power Systems. Once the usual introductions are done, the next question will be to speak for 5 minutes about one or two of your favourite subjects. No questions will be asked on this "speech". It is probably asked just to gauge the candidate's passion for the subject. Then a few Electrical Engineering questions will be asked. These questions can be pretty much anything - complicated theory on Power System Stability to numerical problems to vector diagrams of a power system to functioning of any electrical appliance in the MD's cabin.