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BARC Scientific Officer Interview Questions, Process, and Tips
Top BARC Scientific Officer Interview Questions and Answers
- Q1. What is hagen poiseuille equation and when can it be used
- Q2. What is a daily used CSTR type equipment in kitchen
- Q3. What is bernoulli's equation and its limitations
BARC Scientific Officer Interview Experiences
11 interviews found
Venkatesh K
I applied via Referral
Interview Questionnaire
16 Questions
- Q1. What is hagen poiseuille equation and when can it be used
- Ans.
The Hagen-Poiseuille equation describes the flow of a viscous fluid through a cylindrical pipe or tube.
The equation relates the flow rate of the fluid to the pressure difference, viscosity, length, and radius of the pipe.
It can be used to calculate the flow rate or pressure drop in various fluid systems, such as blood flow in blood vessels or water flow in pipes.
The equation assumes laminar flow, where the fluid flows ...
- Q2. What is bernoulli's equation and its limitations
- Ans.
Bernoulli's equation relates the pressure, velocity, and height of a fluid in motion.
The equation is based on the conservation of energy principle.
It is commonly used in fluid mechanics to analyze the flow of fluids through pipes and over surfaces.
The equation assumes that the fluid is incompressible, non-viscous, and steady-state.
It also assumes that the flow is laminar and that there is no heat transfer or work done ...
- Q3. A logical question regarding fluid flow between two tanks placed at different heights
- Q4. Pump characteristic curves and the relations
- Ans.
Pump characteristic curves show the relationship between flow rate, head, and power.
Pump characteristic curves depict the performance of a pump under different operating conditions.
The curves show the relationship between flow rate (Q), head (H), and power (P).
The curves help in selecting the right pump for a specific application.
The curves can be used to determine the efficiency and operating range of a pump.
Different...
- Q5. Different types of valves for fluid flow control
- Ans.
Valves are used to control fluid flow. Different types include gate, globe, ball, butterfly, and needle valves.
Gate valves: used for full open or full close control
Globe valves: used for throttling control
Ball valves: used for quick shut-off control
Butterfly valves: used for low-pressure control
Needle valves: used for precise flow control
Other types include diaphragm, pinch, and check valves
- Q6. Heat transfer basic questions
- Q7. Type of heat exchangers and their selection criteria
- Ans.
Heat exchangers are devices used to transfer heat between two or more fluids.
Types of heat exchangers include shell and tube, plate, and finned tube heat exchangers.
Selection criteria for heat exchangers include heat transfer efficiency, pressure drop, material compatibility, and cost.
Shell and tube heat exchangers are commonly used in industries such as oil and gas, chemical, and power generation.
Plate heat exchangers...
- Q8. Design methodology for heat exchnager
- Ans.
A design methodology for a heat exchanger involves several steps and considerations.
Identify the heat transfer requirements and constraints
Determine the type and size of heat exchanger suitable for the application
Select the appropriate materials for construction
Calculate the required surface area for heat transfer
Design the flow arrangement and determine the fluid flow rates
Consider pressure drop and fouling factors
Per...
- Q9. Co-current and counter current heat exchanger temperature profiles
- Ans.
In a co-current heat exchanger, the hot and cold fluids flow in the same direction, resulting in a gradual decrease in temperature. In a counter current heat exchanger, the fluids flow in opposite directions, leading to a more efficient heat transfer.
Co-current heat exchanger: gradual decrease in temperature
Counter current heat exchanger: more efficient heat transfer
Co-current: hot and cold fluids flow in the same dire...
- Q10. Velocity profiles inside pipeline and boundary layer formations
- Ans.
Velocity profiles inside pipeline and boundary layer formations
Velocity profiles inside a pipeline refer to the distribution of fluid velocities across the cross-section of the pipe.
Boundary layer formations occur when fluid flows over a solid surface, creating a thin layer of fluid near the surface with different velocity characteristics.
Velocity profiles inside a pipeline can be influenced by factors such as pipe dia...
- Q11. Various phases in heating liquid
- Ans.
The various phases in heating liquid are solid, liquid, and gas.
Heating a solid substance causes it to melt and become a liquid.
Continued heating of the liquid causes it to evaporate and become a gas.
Examples include heating ice to form water and then heating water to form steam.
- Q12. Diffusion basics
- Q13. Mccabe Thiele method and its assumptions
- Ans.
The McCabe Thiele method is a graphical technique used to analyze binary distillation processes.
Assumes constant molar overflow
Assumes constant relative volatility
Assumes ideal behavior of the components
Assumes equilibrium between liquid and vapor phases
Assumes constant molar flow rates
Assumes constant temperature and pressure
- Q14. Cooling towers priciple
- Q15. Gas absorption and Stripping profiles
- Q16. What is a daily used CSTR type equipment in kitchen
- Ans.
A daily used CSTR type equipment in kitchen is a pressure cooker.
Pressure cookers are used to cook food quickly and efficiently.
They work by trapping steam inside the pot, which raises the pressure and temperature.
This allows food to cook faster and retain more nutrients.
Examples of dishes that can be made in a pressure cooker include soups, stews, and rice.
Pressure cookers come in different sizes and materials, such a
Interview Preparation Tips
Experience: For Direct Interview - Should have min GATE cutoff score decided by BARC (Changes every year).
Written test for ones who did not write GATE or did not have enough GATE score.
Round: Technical Interview
Experience: As its been more than 6 years that I had gone through this interview, the above were some of the questions I could recall. The interview went for around 50 min. The committee firstly asks our favorite 3-4 subjects. I chose Fluid mechanics(FM), Heat Transfer(HT), Mass Transfer(MTO), Thermodynamics and Chemical Reaction Engg(CRE) in the given order f preference. The committee would normally have 5-6 members. First 15 minutes the questions were regarding FM, then 15 minutes regarding HT and further 10 min for MTO, last 10 min thermodynamics and CRE which I totally screwed up. The weightage lies with the performance in first three subjects you chose as favorite. The committee is really friendly.They do not pressurize nor try to confuse you. They always give hints to go in the right path. I have stumbled alot in between, but the committee was quite supportive in getting answers from me. After the interview was over, I came out and in 2 min, the attender came out and gave me the medical examination chit. At that time (2009), getting a medical slip gives 90% chances of getting the job. Presently I think getting medical slip gives 50% chances of getting the job.
Tips: Don't think that your academic history would impress them. You selection totally is based on your performance in the interview. Be thorough with the basics of all the core subjects and wisely choose the fav subjects. Always try to understand the hints given by the committee. All they expect is that if the candidate can relate the theory to practical or not. And if you have zero idea about a question do not hesitate to confront rather than blabbering something wrong.
General Tips: Communication skills do not matter in this interview.
Skill Tips: Just brush up the basics. No need to remember all the formulas and equations. I just read Mccabe Smith before the interview.
Skills: Knowledge in Core subjects
College Name: Chaitanya Bharathi Institute Of Technology (CBIT)
Motivation: Scope for exploring new fields, salary Package
(1 Question)
- Q1. Related to core subject
(1 Question)
- Q1. Pass transistor,
Interview Preparation Tips
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...
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BARC interview questions for designations
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
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