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IIT Madras PHD Scholar Interview Questions, Process, and Tips
Top IIT Madras PHD Scholar Interview Questions and Answers
- Q1. What will be the voltage across the capacitor? Why it is so? You are drawing based on memory tell me some logic behind this. What will be the ripple in this and the ampli ...read more
- Q2. Please draw the current flowing through the RL circuit (I vs t). What will be the value of current at t=0.
- Q3. What if we add one capacitor c also in the series (RLC series) and draw the I vs t graph?
IIT Madras PHD Scholar Interview Experiences
2 interviews found
DEEKSHANT GOYAL
Selected
I applied via Company Website and was interviewed in Apr 2024. There were 2 interview rounds.
(1 Question)
- Q1. You have to get a good score on the GATE exam to get the chance for an IIT Interview. I scored a rank of 850 in the general category and got PhD electrical interview call from IIT Madras
(10 Questions)
- Q1. Please tell me something about yourself.
- Q2. Why do you have applied for the direct PhD after your Btech.
- Q3. What is your favourite topic Power Electronics or Machines?
- Ans.
Power Electronics
I enjoy working with power electronic circuits and devices
I find the control and conversion of electrical power fascinating
Power electronics plays a crucial role in renewable energy systems
Examples: inverters, converters, motor drives
- Q4. Please draw the current flowing through the RL circuit (I vs t). What will be the value of current at t=0.
- Ans.
The current flowing through an RL circuit is initially zero and increases exponentially over time.
At t=0, the current in an RL circuit is zero as the inductor initially resists changes in current
As time progresses, the current in the RL circuit increases exponentially towards its maximum value
The time constant of the RL circuit determines how quickly the current reaches its maximum value
- Q5. What if we add one capacitor c also in the series (RLC series) and draw the I vs t graph?
- Ans.
Adding a capacitor in series with RLC circuit will affect the current vs time graph.
The addition of a capacitor will introduce a phase shift in the current waveform.
The presence of the capacitor will cause the current to oscillate at a different frequency compared to the original RLC circuit.
The amplitude of the current waveform may also change with the addition of the capacitor.
- Q6. We want to make 100 v dc to 40 v dc and draw the buck converter for this purpose.
- Ans.
To convert 100 V DC to 40 V DC, a buck converter can be used.
Buck converter steps down voltage by controlling the duty cycle of a switch
It consists of an inductor, a diode, a capacitor, and a switch (usually a MOSFET)
Example: Use a buck converter with a duty cycle of 0.4 to convert 100 V DC to 40 V DC
- Q7. What will be the voltage across the diode in the buck converter.
- Ans.
The voltage across the diode in a buck converter depends on the input voltage, duty cycle, and load resistance.
The voltage across the diode is typically equal to the input voltage minus the voltage drop across the diode.
The duty cycle of the buck converter affects the average voltage across the diode.
The load resistance also impacts the voltage across the diode.
For example, if the input voltage is 12V, the diode has a ...
- Q8. What will be the voltage across the capacitor? Why it is so? You are drawing based on memory tell me some logic behind this. What will be the ripple in this and the amplitude of this curve?
- Ans.
The voltage across a capacitor depends on the charge stored on it and the capacitance. Ripple and amplitude of the curve depend on the input waveform.
Voltage across a capacitor is given by V = Q/C, where Q is the charge stored on the capacitor and C is the capacitance.
The ripple in the voltage across the capacitor depends on the input waveform and the load on the capacitor.
The amplitude of the curve will depend on the ...
- Q9. What will be the final voltage?
- Ans.
The final voltage will depend on the specific circuit and components involved.
Final voltage can be calculated using Ohm's Law (V = IR) where V is voltage, I is current, and R is resistance.
The final voltage may also be affected by factors such as the type of power source, circuit configuration, and any voltage drops across components.
It is important to consider the voltage rating of components to ensure they can handle...
- Q10. Which books have you studied in your Btech to learn these concepts?
Interview Preparation Tips
- Power Electronics
- Network analysis
- basic electrical engineering
- Mathematics
(2 Questions)
- Q1. Mostly technical questions
- Q2. Heat transfer related questions were asked to me
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- Q1. Why you want to join PhD?
- Q2. What are you research interests
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(4 Questions)
- Q1. What is the meaning of research and why you want to do research?
- Ans.
Research is the systematic investigation into a specific topic to discover new knowledge or validate existing theories.
Research involves gathering and analyzing information to answer specific questions or solve problems.
It requires critical thinking, creativity, and attention to detail.
Research can lead to advancements in various fields such as science, technology, medicine, and social sciences.
By conducting research, ...
- Q2. What is difference between doctrinal and empirical research
- Ans.
Doctrinal research is based on existing laws, theories, and principles, while empirical research involves collecting and analyzing data to test hypotheses.
Doctrinal research relies on existing legal or theoretical frameworks, while empirical research involves collecting and analyzing data.
Doctrinal research is often used in fields like law, philosophy, and theology, while empirical research is common in sciences like p...
- Q3. Tell us something about yourself
- Q4. What is the meaning of Longitudinal and cross sectional research.
- Ans.
Longitudinal research involves studying the same group of individuals over a period of time, while cross-sectional research involves studying different groups at one point in time.
Longitudinal research tracks changes in the same group of individuals over time.
Cross-sectional research compares different groups at a single point in time.
Longitudinal research allows for the examination of cause and effect relationships ov...
Reasoning, maths, general english, GK and Current affairs
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Anonymous
posted on 27 May 2021
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1 Question
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Selected
I was interviewed in Oct 2024.
(2 Questions)
- Q1. Regarding your final year project
- Q2. Written assessment
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Anonymous
posted on 23 Mar 2024
(1 Question)
- Q1. About experience, last salary, how to handle boarders etc.
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(2 Questions)
- Q1. Why you want to join PhD?
- Q2. What are you research interests
(4 Questions)
- Q1. What is the meaning of research and why you want to do research?
- Ans.
Research is the systematic investigation into a specific topic to discover new knowledge or validate existing theories.
Research involves gathering and analyzing information to answer specific questions or solve problems.
It requires critical thinking, creativity, and attention to detail.
Research can lead to advancements in various fields such as science, technology, medicine, and social sciences.
By conducting research, ...
- Q2. What is difference between doctrinal and empirical research
- Ans.
Doctrinal research is based on existing laws, theories, and principles, while empirical research involves collecting and analyzing data to test hypotheses.
Doctrinal research relies on existing legal or theoretical frameworks, while empirical research involves collecting and analyzing data.
Doctrinal research is often used in fields like law, philosophy, and theology, while empirical research is common in sciences like p...
- Q3. Tell us something about yourself
- Q4. What is the meaning of Longitudinal and cross sectional research.
- Ans.
Longitudinal research involves studying the same group of individuals over a period of time, while cross-sectional research involves studying different groups at one point in time.
Longitudinal research tracks changes in the same group of individuals over time.
Cross-sectional research compares different groups at a single point in time.
Longitudinal research allows for the examination of cause and effect relationships ov...
Reasoning, maths, general english, GK and Current affairs
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Anonymous
posted on 3 Apr 2024
Selected
I applied via Indeed and was interviewed in Mar 2024. There was 1 interview round.
(1 Question)
- Q1. Introduce yourself Why you join this company What is most you like in our company Why you leave your last job.. reason and explain After your confirmation When you join this company
Interview Preparation Tips
- How to deal with students
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