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Wapcos Electrical Engineer Interview Questions, Process, and Tips
Top Wapcos Electrical Engineer Interview Questions and Answers
- Q1. Current carrying capacity of Dog, Beaver, Zebra & Moose conductor
- Q2. Field tests required before commissioning of power transformers?
- Q3. SLD of 132/33kV & 33/11kV substations
Wapcos Electrical Engineer Interview Experiences
2 interviews found
I applied via Company Website and was interviewed before Aug 2020. There were 5 interview rounds.
Interview Questionnaire
6 Questions
- Q1. Current carrying capacity of Dog, Beaver, Zebra & Moose conductor
- Ans.
The current carrying capacity of conductors varies depending on their material and size.
The current carrying capacity of a conductor is determined by its cross-sectional area.
Conductors with larger cross-sectional areas can carry more current.
The material of the conductor also affects its current carrying capacity.
Copper is a commonly used conductor material with high current carrying capacity.
Aluminum is another condu...
- Q2. SLD of 132/33kV & 33/11kV substations
- Ans.
SLD of 132/33kV & 33/11kV substations
SLD stands for Single Line Diagram
132/33kV substation SLD shows the transmission line, transformer, circuit breaker, isolator, etc.
33/11kV substation SLD shows the distribution line, transformer, circuit breaker, isolator, etc.
- Q3. Field tests required before commissioning of power transformers?
- Ans.
Field tests required before commissioning of power transformers include insulation resistance test, turns ratio test, and polarity test.
Insulation resistance test is conducted to ensure the insulation system is intact and can withstand the operating voltage.
Turns ratio test is performed to verify the turns ratio of the transformer and ensure it meets the design specifications.
Polarity test is carried out to confirm the...
- Q4. Required steps for finalizing of JMC?
- Ans.
Finalizing a JMC involves several steps to ensure its accuracy and completeness.
Review and verify all data and calculations
Ensure compliance with all relevant regulations and standards
Obtain necessary approvals and signatures
Prepare final report or documentation
Archive all relevant documents for future reference
- Q5. Why would you like to join our company?
- Q6. Necessary steps before commissioning a substation
- Ans.
Necessary steps before commissioning a substation
Performing insulation resistance tests
Checking the grounding system
Verifying the correct functioning of protection relays
Testing the transformer and circuit breakers
Ensuring proper labeling and documentation
Conducting a thorough safety inspection
Interview Preparation Tips
I applied via Company Website and was interviewed before Jan 2021. There were 3 interview rounds.
Interview Questionnaire
1 Question
- Q1. Why do you leave the company?
Interview Preparation Tips
Top trending discussions
Interview questions from similar companies
Interview Questionnaire
5 Questions
- Q1. 1.Introduce yourself?
- Q2. 2.How Blocked rotor test is performed for 3 ph induction motor and what does it give?
- Ans.
Blocked rotor test is performed on a 3-phase induction motor to determine its impedance and calculate its locked rotor current.
The motor is connected to a 3-phase supply with the rotor blocked.
The voltage and current are measured and used to calculate the motor's impedance.
The locked rotor current can be determined from the impedance.
The test helps in assessing the motor's performance and identifying any faults or issu
- Q3. 3.Why single phase induction motor is not self stating? what are the different methods of starting of single phase motor?
- Ans.
Single phase induction motor is not self-starting due to the absence of rotating magnetic field. Different methods of starting include capacitor start, split-phase, shaded pole, and reluctance start.
Single phase induction motor lacks rotating magnetic field
Capacitor start uses a capacitor to create a phase shift and start the motor
Split-phase uses a starting winding to create a phase shift
Shaded pole uses a shading coi...
- Q4. 4.what are the different methods of resistance measurement (low, medium and high) and their ranges?
- Ans.
Different methods of resistance measurement and their ranges
Low resistance measurement: 4-wire Kelvin method, range 0.1 μΩ to 1 Ω
Medium resistance measurement: 2-wire method, range 1 Ω to 1 MΩ
High resistance measurement: Megohmmeter method, range 1 MΩ to 10 TΩ
Other methods include 3-wire method and 4-wire guarded method
Measurement accuracy depends on the method used and the quality of the equipment
- Q5. 5.Why lighting arresters are used in transmission lines?
- Ans.
Lightning arresters are used in transmission lines to protect the equipment and infrastructure from damage caused by lightning strikes.
Lightning arresters divert the high voltage surge caused by lightning strikes to the ground, preventing it from damaging the transmission lines.
They provide a low-resistance path for the lightning current to flow, reducing the risk of electrical breakdown and flashovers.
Lightning arrest...
I applied via Newspaper Ad and was interviewed before Apr 2021. There were 3 interview rounds.
Hard work versus smart work.
(3 Questions)
- Q1. Why power plug earth wire is bigger in size?
- Ans.
The power plug earth wire is bigger in size to ensure safety and prevent electrical shocks.
The earth wire provides a path for the current to flow in case of a fault or short circuit.
A larger wire size reduces resistance and allows for the safe dissipation of excess current.
It helps to protect individuals and equipment from electric shock hazards.
The earth wire is connected to the ground, which acts as a reference point...
- Q2. Which conductor of same size will take larger current Al or Cu?
- Ans.
Copper (Cu) conductor will take larger current than Aluminum (Al) conductor of the same size.
Copper has a higher electrical conductivity than Aluminum.
Copper has a lower resistivity than Aluminum.
Copper has better thermal conductivity than Aluminum.
Copper is more commonly used in high-current applications.
Aluminum is often used in overhead power transmission lines due to its lighter weight.
- Q3. What is pulse width modulation in VFD?
- Ans.
Pulse width modulation (PWM) is a technique used in VFD to control the speed of the motor by adjusting the width of the pulses of voltage supplied to the motor.
PWM is a method of controlling the amount of power delivered to a load without changing the voltage level.
In VFD, PWM is used to control the speed of the motor by varying the width of the pulses of voltage supplied to the motor.
The width of the pulses is control...
Interview Preparation Tips
Interview Questionnaire
1 Question
- Q1. What is multimeter
- Ans.
A multimeter is an electronic device used to measure voltage, current, and resistance in electrical circuits.
It can measure AC and DC voltage
It can measure AC and DC current
It can measure resistance
It can also measure other electrical parameters such as capacitance and frequency
It typically has a digital display for easy reading
Examples of multimeter brands include Fluke, Klein Tools, and Extech
Electrical Engineer Interview Questions & Answers
Larsen & Toubro Limited
Anonymous
posted on 15 May 2021
I applied via Company Website and was interviewed in Nov 2020. There was 1 interview round.
Interview Questionnaire
3 Questions
- Q1. Electrical and electronics
- Q2. AC and DC
- Q3. Vibrator ,wilding machine,grander, starting vibrator,rccb ,plcb,elcb earthing
Interview Preparation Tips
I applied via Campus Placement and was interviewed before Jun 2021. There were 2 interview rounds.
(1 Question)
- Q1. Tell about your self
Interview Preparation Tips
Electrical Engineer Interview Questions & Answers
Larsen & Toubro Limited
Anonymous
posted on 21 Dec 2021
I applied via Campus Placement and was interviewed before Dec 2020. There was 1 interview round.
Interview Questionnaire
1 Question
- Q1. 1. Power factor of transformer 2. types of DC machine 3. Working principle of AC alternator 4. DC motors
- Ans.
The question covers power factor of transformer, types of DC machine, working principle of AC alternator, and DC motors.
Power factor of a transformer is the ratio of real power to apparent power.
Types of DC machines include DC motors and DC generators.
AC alternators work on the principle of electromagnetic induction to convert mechanical energy into electrical energy.
DC motors convert electrical energy into mechanical ...
Interview Preparation Tips
(2 Questions)
- Q1. Electrical project work. And testing
- Q2. Testing about transformer
- Ans.
Testing of transformers involves various electrical tests to ensure proper functioning and safety.
One common test is the turns ratio test to verify the turns ratio of primary and secondary windings.
Another test is the insulation resistance test to check for any insulation breakdown.
Short circuit test is performed to determine the copper losses in the transformer.
Open circuit test is done to measure the core losses in t...
I applied via Campus Placement
Interview Questionnaire
2 Questions
- Q1. Electric
- Q2. Electrical
Interview Preparation Tips
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