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BARC Interview Questions, Process, and Tips
Top BARC Interview Questions and Answers
- Q1. What is hagen poiseuille equation and when can it be usedasked in Scientific Officer interview
- Q2. Which capacitors-store higher amount of energy?asked in Research Scientist interview
- Q3. Design principleasked in Civil Engineer interview
BARC Interview Experiences
32 interviews found
Shrlyas
I applied via Walk-in
Interview Questionnaire
16 Questions
- Q1. Differentiator circuit using opamp?(circuit diag,waveform,explaination & if..then sort of a Questions were asked)
- Ans.
A differentiator circuit using opamp is a circuit that produces an output voltage proportional to the rate of change of the input voltage.
The circuit consists of an opamp, a capacitor, and a resistor.
The input voltage is applied to the non-inverting input of the opamp.
The output voltage is taken from the output of the opamp.
The capacitor and resistor are connected in series between the output and the inverting input of...
- Q2. What is virtual ground?
- Ans.
Virtual ground is a point in a circuit that is maintained at a constant voltage level despite changes in current flow.
Virtual ground is often used in op-amp circuits to create a reference point for the input signal.
It is created by connecting the inverting and non-inverting inputs of an op-amp together.
Virtual ground is not a physical ground, but rather a voltage level that behaves like ground.
It is important to mainta...
- Q3. Draw a circuit to implement V=V1+V2?
- Ans.
A circuit to implement V=V1+V2
Use two voltage sources V1 and V2
Connect them in series
Measure the voltage across the series connection
- Q4. An opamp configuration was given with -ve feedback.In the feedback path two diodes were connected in parallel with reverse polarity.A triangular wave was given at the i/p . Question was explain the circu...
- Ans.
Opamp with -ve feedback and parallel diodes in feedback path, triangular wave at i/p. Explain circuit and o/p waveform.
The diodes act as clamping diodes, limiting the output voltage swing
The output waveform will be a clipped triangular wave
The amplitude of the output waveform will depend on the forward voltage drop of the diodes
The frequency of the output waveform will be the same as the input triangular wave
- Q5. What is backend technology? VLSI uses backend/frontend?
- Ans.
Backend technology refers to the server-side of an application. VLSI uses backend technology for designing and testing of integrated circuits.
Backend technology refers to the server-side of an application
It includes the database, server, and application logic
VLSI uses backend technology for designing and testing of integrated circuits
Frontend technology refers to the client-side of an application
It includes the user in
- Q6. What is DRC checker?
- Ans.
DRC checker is a software tool used to check the design rule compliance of integrated circuits.
DRC stands for Design Rule Check.
It is used to ensure that the layout of an integrated circuit meets the specifications of the design.
DRC checker is an important tool in the semiconductor industry.
Examples of DRC checkers include Calibre, IC Validator, and Hercules.
DRC checker can detect errors such as short circuits, open ci...
- Q7. Explain CMOS fabrication steps?
- Ans.
CMOS fabrication involves multiple steps including wafer preparation, photolithography, etching, and doping.
The process starts with wafer preparation, where a silicon wafer is cleaned and polished.
Next, a layer of oxide is grown on the wafer surface.
Photolithography is then used to pattern the oxide layer with a photoresist material.
Etching is used to remove the oxide layer in the areas not covered by the photoresist.
D...
- Q8. What type of etching is used during photolithography process?
- Ans.
The photolithography process uses a type of etching called wet etching or dry etching.
Wet etching involves using a liquid chemical solution to remove material from the substrate.
Dry etching involves using plasma or reactive ions to remove material from the substrate.
The choice of etching method depends on the material being etched and the desired outcome.
Examples of materials commonly etched during photolithography inc...
- Q9. What does 1nm technology specify? Few other related stuffs
- Q10. Draw 4-bit ring counter and explain its working with waveforms?(
- Ans.
A 4-bit ring counter is a circuit that cycles through four states in a circular pattern.
A ring counter is a type of shift register that has feedback from the last stage to the first stage.
The output of each stage is connected to the input of the next stage, with the last stage connected to the first stage.
The counter advances one step on each clock pulse, with the output of one stage becoming high and the others low.
Th...
- Q11. Draw a BJT circuit which acts as a switch? why is Vce(sat)=0.2V? what will happen if resistor is connected in between emitter & ground point & many other related Q?
- Ans.
A BJT circuit can act as a switch with Vce(sat)=0.2V. Adding a resistor between emitter and ground affects the switching speed.
BJT circuit can be configured as a switch by connecting the base to a voltage source and the collector to the load.
When the base-emitter junction is forward-biased, the transistor turns on and allows current to flow through the collector-emitter path.
Vce(sat) is the voltage drop across the coll...
- Q12. Draw circuit diagram of a tubelight? How is it functioning?
- Ans.
A tubelight circuit diagram consists of a choke, starter, and a tube filled with gas. It functions by ionizing the gas inside the tube to produce light.
The circuit diagram includes a choke, starter, and a tube filled with gas
The choke regulates the current flow to the tube
The starter provides a high voltage to ionize the gas inside the tube
The ionized gas produces ultraviolet light which is converted to visible light b...
- Q13. How does your fan regulator works? What is being changed? How does it control the fan speed?
- Ans.
Our fan regulator works by changing the voltage supplied to the fan motor, which in turn controls the fan speed.
The regulator adjusts the voltage supplied to the fan motor
This changes the speed of the fan blades
The regulator can be adjusted manually or automatically based on temperature or humidity
Examples of fan regulators include rheostats, triacs, and pulse-width modulators
- Q14. Explain the pts in an electrical socket? What is shown in the CRO if probes of the CRO are inserted in the two live wires? What if one is connected to earth?
- Ans.
The points in an electrical socket are live, neutral, and earth. If probes of the CRO are inserted in the two live wires, the CRO will show AC voltage. If one is connected to earth, the CRO will show a voltage of zero.
Electrical sockets have three points: live, neutral, and earth
If probes of the CRO are inserted in the two live wires, the CRO will show AC voltage
If one live wire is connected to earth, the CRO will show...
- Q15. How does a TESTER work? Explain its general operation? Will the LED glow if the end is contacted wearing ur slippers?
- Ans.
A tester is an electronic device used to check the presence of an electric current in a circuit.
A tester works by completing a circuit and measuring the flow of electricity.
It typically has two probes, one positive and one negative, that are used to make contact with the circuit.
If the circuit is complete and there is electricity flowing, the tester will indicate this through a light or sound.
Wearing slippers will not ...
- Q16. An electrician who comes to do ne electric work always has a bulb & a socket in his kit.when he connects one end of the wire to the line & other to neutral wht happens? will the bulb glow? what happens wh...
Interview Preparation Tips
Experience: Interview date: 25th June
Location: BARC Mumbai
Duration:1.30hrs
Status: Not Qualified
Interview started with a brief discussion on my BE project(duration:5-10min appx)
5 fav sub:
1.Analog integrated circuits
2.VLSI
3.Digital design
4.Semiconductor Devices
5.Power Electronics
Tips: For everything u write in paper counter questions will always b asked. So b strong with your basics & b clear with what you are putting down.
My suggestion whatever subject u do it deeply.Clear your Basics as much as u can. If & else type question will always be asked whenever you ans to a Question so b prepared.
Think from a practical application point of view too.
General Tips: For everything u write in paper counter questions will always b asked. So b strong with your basics & b clear with what you are putting down.
My suggestion whatever subject u do it deeply.Clear your Basics as much as u can. If & else type question will always be asked whenever you ans to a Question so b prepared.
Think from a practical application point of view too.
Skills: Power Electronics, Semiconducto, Digital Design, VLSI, Analog Integrated Circuits
Skills evaluated in this interview
(1 Question)
- Q1. Why only BARC ?
Project Intern Interview Questions asked at other Companies
(1 Question)
- Q1. Design principle
- Ans.
Design principle refers to the fundamental concepts and guidelines that govern the process of designing structures or systems.
Design principle helps in ensuring functionality, efficiency, and safety of the structure or system.
It involves considering factors such as aesthetics, cost-effectiveness, and sustainability.
Examples include principles of structural integrity, material selection, and environmental impact assessm
Civil Engineer Interview Questions asked at other Companies
(1 Question)
- Q1. Related to core subject
Top BARC Scientific Officer Interview Questions and Answers
Scientific Officer Interview Questions asked at other Companies
BARC interview questions for popular designations
(1 Question)
- Q1. Project Origens Observation Profile s.
Project Origens to any Observation profile Topics.
Industrial Project Observation to any requirement Case Study.
Industrial Project Order/ Contact or Regular Working environment assignment to sustain.
(1 Question)
- Q1. Project management of HR Round manuals.
Project Origens to Observation expected
Question Coding Test.
Project Origens to Observation and expectations Profile forcast sustain
Aptitude Test Manual s.
(1 Question)
- Q1. Project management required technical Manuals for profile sustain environment.
Interview Preparation Tips
The HR Project Manager,
BARC RTI ,
Mumbai.
Sub :- Regarding Inter Planet Project Geography Origens Observation RTI Act 2005 Order to sustain profile manual.
Thanks and regarding
M Madhan MBA
BARC RTI Project Act 2005 Order.
Project Manager Interview Questions asked at other Companies
BANTU VENKATESH
(1 Question)
- Q1. Difference between mass and weight
- Ans.
Mass is the amount of matter in an object, while weight is the force exerted on an object due to gravity.
Mass is a scalar quantity and is measured in kilograms.
Weight is a vector quantity and is measured in newtons.
Mass remains constant regardless of the location, while weight varies depending on the gravitational pull.
Mass can be measured using a balance scale, while weight is measured using a spring scale.
For example...
Interview Preparation Tips
Trainee Interview Questions asked at other Companies
(1 Question)
- Q1. Pass transistor,
Interview Preparation Tips
Top BARC Scientific Officer Interview Questions and Answers
Scientific Officer Interview Questions asked at other Companies
Selected
I applied via Newspaper Ad and was interviewed before Apr 2023. There were 2 interview rounds.
It was a 100 question subject test
(19 Questions)
- Q1. What was your top 3 interested subjects?
- Ans. Electrical Machines, Power Engineering and Networks
- Q2. In an RLC circuit what is the power quality across inductor
- Ans.
In an RLC circuit, the power quality across an inductor is reactive power.
The power quality across an inductor in an RLC circuit is reactive power, which means it does not result in actual work being done but rather stores and releases energy in the form of magnetic fields.
The reactive power in an inductor leads to a phase shift between voltage and current, with the current lagging behind the voltage in an inductive ci...
- Q3. Can you use it to transfer active power?
- Ans.
Yes, active power can be transferred using it.
Yes, active power can be transferred using electrical systems like transformers and transmission lines.
Active power transfer is essential for the functioning of electrical grids and power distribution networks.
Examples include transferring power from a power plant to homes and businesses.
Active power transfer is measured in watts (W) or kilowatts (kW).
- Q4. You mean a lagging zero power factor device can deliver active power?
- Ans.
Yes, a lagging zero power factor device can deliver active power.
A lagging zero power factor device can still deliver active power because it consumes both real and reactive power.
The power factor is a measure of how effectively electrical power is being converted into useful work output.
Even though the power factor may be lagging (less than 1), the device can still deliver active power to the load.
Examples of devices ...
- Q5. When you keep two conductors together with flowing current through them in same direction, what happens to them?
- Ans.
The conductors will attract each other due to the magnetic field produced by the current flowing through them.
The conductors will experience a force of attraction between them
This is due to the magnetic field produced by the current flowing through the conductors
The direction of the current flow will determine the direction of the force
- Q6. What is the basic electrical power equation?
- Ans.
The basic electrical power equation is P = VI, where P is power, V is voltage, and I is current.
The basic electrical power equation is P = VI
Power (P) is measured in watts (W)
Voltage (V) is measured in volts (V)
Current (I) is measured in amperes (A)
The equation shows the relationship between power, voltage, and current
- Q7. You mean higher the voltage higher the power
- Ans.
Higher voltage does not necessarily mean higher power, as power is determined by both voltage and current.
Power is calculated as the product of voltage and current (P = V * I)
Increasing voltage alone does not always increase power, as current may decrease
For example, a device operating at 10V and 1A has the same power as a device operating at 5V and 2A
- Q8. Then why do transmission voltage is kept high? Is it not counter intuitive that higher the voltage higher will be the power loss.
- Ans.
Transmission voltage is kept high to reduce power loss over long distances.
Higher voltage reduces current, which in turn reduces power loss in transmission lines.
High voltage allows for efficient long-distance transmission without significant power loss.
Step-up transformers increase voltage for transmission, while step-down transformers decrease voltage for distribution.
Power loss is proportional to the square of the c...
- Q9. What shall be the source impedance for satisfying maximum power transfer in case of AC circuits?
- Ans.
The source impedance for maximum power transfer in AC circuits should be equal to the complex conjugate of the load impedance.
Source impedance should be equal to the complex conjugate of the load impedance for maximum power transfer.
This condition ensures that the maximum power is transferred from the source to the load.
In AC circuits, the source impedance should match the load impedance to achieve maximum power transf...
- Q10. Why do you need a complex conjugate to make the power transfer as maximum in simple terms?
- Ans.
Complex conjugate is needed to maximize power transfer by ensuring the impedance matching between the source and load.
Complex conjugate helps in achieving impedance matching between source and load
Impedance matching minimizes reflections and maximizes power transfer
By taking the complex conjugate, the real part of the impedance is matched while the imaginary part cancels out
- Q11. Why common emitter is also called as inverter?
- Ans.
Common emitter is called an inverter because it produces an output that is the opposite of the input signal.
In a common emitter configuration, the output signal is 180 degrees out of phase with the input signal.
The common emitter amplifier produces a phase shift of 180 degrees, effectively inverting the input signal.
This inversion property is why the common emitter amplifier is also known as an inverter.
- Q12. Which configuration of transistor is called as buffer and why?
- Ans.
A transistor configuration with high input impedance and low output impedance is called a buffer.
Buffers are used to isolate two circuits with different impedance levels.
Common emitter or common collector configurations are often used as buffers.
Buffers help prevent loading effects and signal distortion in electronic circuits.
- Q13. Can an opAmp be used as a computer?
- Ans.
No, an opAmp cannot be used as a computer.
OpAmps are analog devices used for amplifying signals, not for digital computation.
OpAmps lack the necessary components such as memory, processing units, and input/output interfaces to function as a computer.
Computers require complex digital circuits and software to perform tasks, which opAmps are not designed for.
- Q14. Can you draw the two transistor model of a Silicon Controlled Rectifier and explain how it gets forward conductive with gate pulse?
- Ans.
The two transistor model of a Silicon Controlled Rectifier consists of an NPN and PNP transistor connected in a feedback loop.
The NPN transistor is connected in series with the PNP transistor, forming a regenerative feedback loop.
When a gate pulse is applied, it triggers the NPN transistor to turn on, which in turn triggers the PNP transistor to turn on.
This regenerative process continues until the SCR is in forward co...
- Q15. Why single phase induction is not self starting by nature?
- Ans.
Single phase induction motors are not self-starting due to the absence of a rotating magnetic field.
Single phase induction motors lack a rotating magnetic field, which is necessary for self-starting.
The starting torque in single phase motors is zero, making it impossible for them to start on their own.
Additional starting mechanisms such as capacitors or shaded poles are required to create the necessary rotating magneti...
- Q16. Why DC series motor is preferred for traction applications
- Ans.
DC series motor is preferred for traction applications due to its high starting torque and speed control capabilities.
DC series motor provides high starting torque, making it suitable for traction applications where high torque is required to start moving heavy loads.
DC series motor offers good speed control capabilities, allowing for smooth acceleration and deceleration in traction applications.
DC series motor is simp...
- Q17. What are the limitations of KCL and KVL
- Ans.
KCL and KVL have limitations in complex circuits and non-linear components.
KCL assumes all currents entering a node must equal all currents leaving, which may not hold true in complex circuits.
KVL assumes the sum of voltage drops in a closed loop is zero, which may not be accurate in circuits with non-linear components.
Both laws are based on ideal conditions and may not be applicable in real-world scenarios.
KCL and KVL...
- Q18. Where do you use Barkhausen Criteria
- Ans.
Barkhausen Criteria is used in determining the conditions for the onset of magnetic domain wall motion in ferromagnetic materials.
Used in understanding the behavior of magnetic domains in ferromagnetic materials
Helps in predicting the conditions for the initiation of magnetic domain wall motion
Important in the study of magnetic hysteresis and magnetic materials
- Q19. Why 25 KV is preferred for railway traction?
- Ans.
25 KV is preferred for railway traction due to its higher efficiency, reduced power loss, and ability to support longer distances.
25 KV allows for higher speeds and heavier loads compared to lower voltages like 1.5 KV or 3 KV
It reduces power loss during transmission, leading to higher efficiency and cost savings
Higher voltage enables longer distances between substations, reducing infrastructure costs
25 KV is a standard...
Interview Preparation Tips
Stay well informed and up to date about interview.
All the best
Top BARC Scientific Officer Interview Questions and Answers
Scientific Officer Interview Questions asked at other Companies
Selected
I applied via Newspaper Ad and was interviewed before Oct 2022. There was 1 interview round.
(5 Questions)
- Q1. Explain what is rotating magnetic field in an ac motor
- Ans.
Rotating magnetic field in an AC motor is a magnetic field that rotates within the motor, causing the rotor to turn and generate mechanical energy.
Rotating magnetic field is created by the interaction of stator windings with the alternating current flowing through them.
The rotating magnetic field induces currents in the rotor, which in turn creates a torque that causes the rotor to rotate.
This rotation of the rotor is ...
- Q2. Nyqyuist plot of typical systems
- Ans.
Nyquist plot is a graphical representation of a system's frequency response in the complex plane.
Nyquist plot shows how a system responds to sinusoidal inputs at different frequencies.
It is used to analyze stability and performance of control systems.
The plot typically consists of a plot of the real part of the transfer function against the imaginary part.
Nyquist plots are commonly used in control engineering and signa...
- Q3. What happens to performance of a transformer if we remove a slice of the core
- Ans.
Removing a slice of the core in a transformer can lead to decreased efficiency and increased losses.
Removing a slice of the core can disrupt the magnetic flux path, leading to increased eddy current losses.
It can also result in increased hysteresis losses, as the magnetic field is no longer evenly distributed.
Overall, the performance of the transformer will be negatively impacted, with decreased efficiency and potentia...
- Q4. Explain the working principle of induction motor
- Ans.
An induction motor works on the principle of electromagnetic induction to generate rotating magnetic field.
Induction motor has a stator with a set of windings that are connected to an AC power supply.
When AC current flows through the stator windings, it produces a rotating magnetic field.
This rotating magnetic field induces current in the rotor windings, causing it to rotate.
The rotor never reaches the synchronous spee...
- Q5. What happens to voltage of the transformer if remove crosssectional slice of the core
- Ans.
Removing a cross-sectional slice of the core in a transformer will decrease the voltage.
Removing a cross-sectional slice of the core reduces the magnetic flux in the transformer
This reduction in magnetic flux leads to a decrease in the induced voltage in the windings
As a result, the voltage output of the transformer decreases
This can impact the efficiency and performance of the transformer
Interview Preparation Tips
Top BARC Scientific Officer Interview Questions and Answers
Scientific Officer Interview Questions asked at other Companies
Selected
I applied via Company Website and was interviewed before May 2023. There was 1 interview round.
(1 Question)
- Q1. On corona discharge.
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Research Fellow Interview Questions asked at other Companies
(1 Question)
- Q1. They ask mostly related about internships, fieldwork, academic basics
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