Rishabh Instruments Limited Research and Development Interview Questions and Answers

Round: Test
Experience: Just logical questions. Maybe create a DFA and NFA.
Duration: 1 hour
Total Questions: 20

Round: Coding
Experience: Given two questions. Each question is written like a story, but once you get the idea, it will be a simple question

College Name: Govt. Model Engineering College

Round: Test
Experience: • 1 question was on time complexity of searching an unsorted array.
• 2 questions were on recursion, ie, number of recursive calls.
• 1 question on analysing given function on string.
• 1 question was on probability(Two hotels, say A and B. Probability of moving from A to B is 2/3, staying at A is 1/3. Probability of moving from B to A and staying at B is 1/2. If they make decisions each hour, and if they were at A at 7:00 pm, what is the probability that they will be at B at 10:00 pm).
• If a set has elements {1,2,3,4 .... n}. Then what is the sum of elements of it's power set. (Ex: S = {1,2}. Then power set is {{},{1},{2},{1,2}}. The sum is 6.
• If a set has elements {1,2,3,4,5,6,7,8,9,10}. Then how many subsets of 3 elements has no consecutive elements.
• 1 question was on designing a DFA for a string starting with a and ending with c and has at least b in it.
• 1 question had machine instructions. We had to find out minimum number of cycles needed to execute the given set of instructions. (a) If the instructions are executed in the given order. (b) If the instructions are executed in random order.
• 1 puzzle on bridges.

Tips: In this round they not only see the answer. They also verify how you approached(So, give correct explanation to your answers).
Duration: 90 minutes
Total Questions: 10

Round: Coding Round
Experience: Two questions were there. 3 hours duration.

1. Long question, I don't remember fully. I'll just give input/output examples. It was basically on string decoding. If jon2snow3 is there the decoded string will be jonjonsnowjonjonsnowjonjonsnow. Given a string and an integer k we have print the kth character in the decoded string
input:
jon2snow3
8
output:
n

2. Given an array and an integer k return the number of contiguous sub arrays whose sum is divisible by k.
input format:
n k

input:
4 5
10 0 4 5

output:
4

explaination: {10},{0},{10,0},{5} are the sub arrays with sum divisible by 5.


Tips: You will have lots of time, so try to optimise the solution if you can. Remember here also they review each individual's code.

Round: Technical Interview
Experience: They will help you a lot if you are stuck at some point in the question. You have to be smart enough to grasp the clue.
Tips: They only ask questions only on data structures and algorithms.

Skill Tips: You have to be strong in coding. Algorithm questions will be mostly on dynamic programming. Data structures questions are mostly on trees.
Skills: C Programming, Maths(esp Probability), Algorithms And Data Structures
Duration: 5
College Name: JSS Mahavidyapeetha Sri Jayachamarajendra College Of Engineering, Mysore

Round: Case Study Interview
Experience: Recommended Approach
Broke it into financial and non-financial and said ROI seems to be the best metric in financial. Went ahead after getting her buy-in and looked at various cost components in detail like labor, overheads etc. Throughout the interview, I was asked to go deeper and even when I was asked to move horizontally to other cost components, there was no closure of an issue. In the end, was just asked to summarize whatever we had done so far with 2 concluding statements

PI questions
Totally work and CV related cross questioning Why did you do this ELP and what did you learn Why SMC now This was a kind of stress interview where questions would start before I finished my answer. The same tone carried on in the case where scoping questions were frowned upon
Tips: What was good: Cool under pressure, confident What could be better: Take the hint if the interviewer is not giving data and lay out a structure and then ask questions explaining their relevance

Skills:
College Name: Indian School Of Business (ISB)

Round: Case Study Interview
Experience: Recommended Approach
Depends on the interviewer and his discussion

PI questions
About yourself
Something that is not on your resume
Example of Learning from an achievement
Example of Learning from your work experience and what could you have don
Tips: What was good: PI, Patience to go on during the role play What could be better: I got caught up in the role play when he gave excuses not to cooperate

Skills:
College Name: Indian School Of Business (ISB)

Round: Case Study Interview
Experience: Recommended Approach
Started with a Cost – Benefit – Risk and was asked to mainly consider capability building under major costs
Was given numbers for 2-3 projects and the case ended after straightforward calculations

PI questions
Talk about a personality trait that has evolved over time
An example of personal and professional success and cross questions on that In hindsight what could you have done better at work
Tips: What was good: PI, Calculations accuracy What could be better: I was given feedback to engage the interviewer more so that I could start with a more refined structure instead of a conventional structure

Skills:
College Name: Indian School Of Business (ISB)

Round: Case Study Interview
Experience: Started with a Cost – Benefit – Risk and was asked to mainly consider capability building under major costs Was given numbers for 2-3 projects and the case ended after straightforward calculations
Tips: What was good: PI, Calculations accuracy What could be better: I was given feedback to engage the interviewer more so that I could start with a more refined structure instead of a conventional structure

Skills:
College Name: Indian School Of Business (ISB)

Round: Case Study Interview
Experience: Broke it into attracting required labor at the site or outsourcing Within outsourcing talked about factors by which I would identify countries for this task.
In the end was just asked to recommend 2 industries from where I could use skills of existing engineers and I came up with other power generation industries and aerospace for blade design
Tips: What was good: PI, Involving the interviewer in case discussion What could be better: Quicker solution of case, he gave me a lot of hints and nudges for the solution After the final interview, I was also asked to rank each performance to check self-awareness. Overall, SMC checks a lot on cultural awareness, fit in their culture and personality traits.


Skills:
College Name: Indian School Of Business (ISB)