Subhasree Projects Electrical Trainee Interview Questions, Process, and Tips

Q1. Basic law of governing transformer
Ans. 
The basic law governing transformers is the law of electromagnetic induction.
• The law states that when the magnetic field around a conductor changes, an electromotive force (EMF) is induced in the conductor.

• This EMF can cause a current to flow if the conductor forms a closed loop.

• In a transformer, this principle is used to transfer electrical energy from one circuit to another through electromagnetic induction.

• The prima...read more
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Q2. What are various losses in transformer
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Various losses in a transformer include copper losses, iron losses, and stray losses.
• Copper losses occur due to resistance in the transformer windings.

• Iron losses, also known as core losses, occur due to hysteresis and eddy currents in the transformer core.

• Stray losses occur due to leakage flux and stray capacitance in the transformer.

• Copper losses and iron losses are the major contributors to total losses in a transfo...read more
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Q3. Difference between AC and DC
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AC and DC are two types of electrical current. AC changes direction periodically while DC flows in one direction.
• AC stands for Alternating Current and DC stands for Direct Current.

• AC changes direction periodically, typically in a sinusoidal waveform.

• DC flows in one direction only, maintaining a constant polarity.

• AC is used for power transmission over long distances due to its ability to be easily converted to different...read more
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Q4. What is mean by inverter and its basic working
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An inverter is a device that converts DC power to AC power.
• An inverter is commonly used in electrical systems to convert the direct current (DC) produced by sources such as batteries or solar panels into alternating current (AC) that can be used to power appliances and devices.

• The basic working principle of an inverter involves the use of electronic components such as transistors to switch the DC input on and off rapid...read more
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Q5. What all component are required in solar panel installation and brief them
Ans. 
Solar panel installation requires several components including solar panels, inverters, mounting systems, wiring, and electrical protection devices.
• Solar panels: These are the main components that convert sunlight into electricity.

• Inverters: They convert the direct current (DC) produced by solar panels into alternating current (AC) that can be used in homes or fed into the grid.

• Mounting systems: These are used to secur...read more
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Q6. What all various type of circuit breaker are there their uses and their rating.
Ans. 
There are various types of circuit breakers with different uses and ratings.
• Miniature Circuit Breaker (MCB) - used in residential and commercial buildings

• Molded Case Circuit Breaker (MCCB) - used in industrial applications

• Air Circuit Breaker (ACB) - used for high voltage applications

• Ground Fault Circuit Interrupter (GFCI) - used to protect against electrical shocks

• Residual Current Circuit Breaker (RCCB) - used to detec...read more
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Q7. Why you choose electrical engineering and what all project you has done and what are your final year project if you mention in resume.
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Q1. What is Current?
Ans. 
Current is the flow of electric charge through a conductor.
• Current is measured in Amperes (A).

• It is the rate of flow of electric charge past a point in a circuit.

• Current can be either direct current (DC) or alternating current (AC).

• In a series circuit, the current remains the same throughout.

• Ohm's Law states that current is directly proportional to voltage and inversely proportional to resistance.
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Q2. What is voltage?
Ans. 
Voltage is the difference in electric potential between two points in a circuit, measured in volts.
• Voltage is the force that pushes electric current through a circuit.

• It is measured in volts (V).

• Voltage is the potential difference between two points in a circuit.

• Higher voltage means more potential energy available to move electrons.

• Example: A battery with a voltage of 1.5V can power a small flashlight.
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Q3. Type of electrical machine
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Electrical machines are devices that convert electrical energy into mechanical energy or vice versa.
• Types of electrical machines include motors (convert electrical energy to mechanical energy) and generators (convert mechanical energy to electrical energy).

• Common examples of electrical machines include induction motors, synchronous motors, DC motors, and transformers.

• Electrical machines play a crucial role in various i...read more
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Q1. What is synchronous generator?
Ans. 
A synchronous generator is a device that converts mechanical energy into electrical energy with a constant speed of rotation.
• Consists of a rotor and a stator

• Produces AC power at a fixed frequency

• Used in power plants, wind turbines, and hydroelectric plants
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Q2. What is clogging?
Ans. 
Clogging is the blockage or obstruction of a pipe, tube, or passage by foreign material or waste.
• Clogging occurs when foreign material or waste accumulates and restricts the flow of fluids or gases.

• Common examples of clogging include hair in a shower drain, food particles in a kitchen sink drain, or dirt in a vacuum cleaner filter.

• Clogging can lead to reduced efficiency, malfunction, or damage in various systems such a...read more
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Q3. Which type of electrical machine used in wind turbine for power generation?
Ans. 
The type of electrical machine used in wind turbines for power generation is the induction generator.
• Induction generator is commonly used in wind turbines due to its simplicity, reliability, and low maintenance requirements.

• It operates on the principle of electromagnetic induction to convert mechanical energy from the wind into electrical power.

• Induction generators do not require a separate power source for excitation,...read more
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Q1. Am I able to climb 92 meter wind turbine?
Ans. 
Yes, as a Junior Engineer Electrical, you should be physically capable of climbing a 92 meter wind turbine.
• Physical fitness is important for climbing such heights

• Proper safety training and equipment are necessary

• Experience in working at heights is beneficial
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Q2. What is My weakness ?
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Q3. What is my strength?
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My strength lies in my problem-solving skills, attention to detail, and ability to work well under pressure.
• Strong problem-solving skills

• Attention to detail

• Ability to work well under pressure
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Q4. What is my achievement?
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Q5. What is my salary expectation?
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Q1. DFIG Generator?
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Q2. Dv/dt and du/dt filter?
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Q3. Gearbox oil Grade ?
Ans. 
The gearbox oil grade is typically specified by the manufacturer based on the requirements of the gearbox.
• Gearbox oil grade is determined by the viscosity and additives needed for proper lubrication.

• Common gearbox oil grades include SAE 80, SAE 90, and SAE 140.

• Consult the manufacturer's specifications or maintenance manual for the recommended gearbox oil grade.
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Pitch convertor system,

Q1. Salary discussion
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Q1. Substation single diagram
Ans. 
A substation single-line diagram is a simplified representation of a power system showing the electrical connections and components.
• It shows the electrical connections between various components in a substation, such as transformers, circuit breakers, and switches.

• The diagram typically includes symbols to represent different types of equipment and their interconnections.

• It helps engineers and operators understand the f...read more
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Q2. All equipment arround the substation
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Q1. CT and PT ampere ?
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Q2. 5 golden rules? Transformer kV ?
Ans. 
5 golden rules for electrical safety. Transformer kV is dependent on load and voltage requirements.
• Always turn off power before working on electrical equipment

• Use proper personal protective equipment

• Regularly inspect and maintain electrical equipment

• Follow lockout/tagout procedures

• Properly train and educate employees on electrical safety

• Transformer kV is determined by load and voltage requirements

• Higher kV transformers...read more
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