1. Tell us why Are You Interested in This Particular Type of Work?
Depending on the type of job you are interviewing for (industrial, residential or commercial), you might be asked why you are interested in that aspect of the field and not others. Be prepared to explain why you are seeking the particular type of position the interview is for.
2. Tell us what are the advantages of star-delta starter with induction motor?
(1). The main advantage of using the star delta starter is reduction of current during the starting of the motor.Starting current is reduced to 3-4 times Of current of Direct online starting.
(2). Hence the starting current is reduced , the voltage drops during the starting of motor in systems are reduced.
3. Suppose if one lamp connects between two phases it will glow or not?
If the voltage between the two phase is equal to the lamp voltage then the lamp will glow. When the voltage difference is big it will damage the lamp and when the difference is smaller the lamp will glow depending on the type of lamp.
4. Tell us what is Automatic Voltage regulator(AVR)?
AVR is an abbreviation for Automatic Voltage Regulator. It is important part in Synchronous Generators, it controls theoutput voltage of the generator by controlling its excitation current. Thus it can control the output Reactive Power of the Generator.
5. Do you know operation carried out in Thermal power stations?
The water is obtained in the boiler and the coal is burnt so that steam is obtained this steam is allowed to hit the turbine , the turbine which is coupled with the generator generates the electricity.
6. Tell us why Are You Interested in the Electrical Trade?
If you are new to the electrical trade or are applying for an apprenticeship, you will probably be asked this question. Employers ask this question because they want to hear about your motivations and goals so that can be sure that you really have an interest in the field.
7. Please explain what is the difference between MCB & MCCB, Where it can be used?
MCB is miniature circuit breaker which is thermal operated and use for short circuit protection in small current rating circuit. MCCB moulded case circuit breaker and is thermal operated for over load current and magnetic operation for instant trip in short circuit condition.under voltage and under frequency may be inbuilt. Normally it is used where normal current is more than 100A.
8. Explain me what will happen if DC supply is given on the primary of a transformer?
Mainly transformer has high inductance and low resistance.In case of DC supply there is no inductance ,only resistance will act in the electrical circuit. So high electrical current will flow through primary side of the transformer.So for this reason coil and insulation will burn out.
9. What Are Your Salary Expectations as Electric Mechanic?
Be prepared to quote a realistic salary expectation for the position that you are applying for. Use your knowledge about the profession and the company to make a request that meets your needs while also being reasonable.
10. Tell us what Qualifies You to Work as an Electrician?
Employers will want to know if you have the right skills and credentials to work as a professional electrician. Mention any relevant certifications, licenses and education, as well as any experience from previous jobs that specifically pertain to an electrician's job.
11. Explain me what is meant by insulation voltage in cables? explain it?
It is the property of a cable by virtue of it can withstand the applied voltage without rupturing it is known as insulation level of the cable.
12. Explain me about your electrical related on-the-job training?
I received extensive on-the-job training in my first position right out of university. I had a powerful mentor who allowed me to work by his side every day for six months. The most valuable lesson I learned during this on the job training was the blueprint and schematic reading and analysis.
13. Do you know what Is the Difference Between a Breaker and a Fuse?
Interviewers sometimes ask about what might seem like very basic knowledge to weed out people who lack the foundational knowledge necessary to succeed in the job. Be prepared to explain key concepts relevant to the work of an electrician to demonstrate that you have an understanding of the work and what it involves. If you happen to get asked a question that you don't know the answer to, you still might be fine if you can explain to the interviewer how you would approach finding the answer if faced with a need to know the information in the field.
14. Tell us how Would Your Past Boss or Coworkers Describe You?
Interviewers who ask this question want to get a sense of your thoughts on how people you have worked with in the past view you as a team member. Be prepared to list and describe a few of your key traits from the perspective of someone who has spent time working side-by-side with you. Include items specific to your job capabilities as well as your approach to work, such as whether you are a team player or prefer working independently and if you are hard-working, loyal and tenacious when it comes to solving problems.
15. Tell us what are the advantages of speed control using thyristor?
Advantages:
☛ 1. Fast Switching Characterstics than Mosfet, BJT, IGBT
☛ 2. Low cost
☛ 3. Higher Accurate.
16. Explain me why Negative Feedback is preffered in the Control System?
The role of Feedback in control system is to take the sampled output back to the input and compare output signal with input signal for error ( deviation from the desired result).
Negative Feedback results in the better stability of the system and rejects any disturbance signals and is less sensitive to the parameter variations. Hence in control systems negative feedback is considered.
17. Do you know what is reverse power relay?
Reverse Power flow relay are used in generating stations's protection. A generating stations is supposed to fed power to the grid and in case generating units are off,there is no generation in the plant then plant may take power from grid. To stop the flow of power from grid to generator we use reverse power relay.
18. Can you explain me what is a feedback in Control System?
The Feedback in Control System in one in which the output is sampled and proportional signal is fed back to the input for automatic correction of the error ( any change in desired output) for futher processing to get back the desired output.
19. Please explain what is the function of anti-pumping in circuit breaker?
When breaker is close at one time by close push button,the anti pumping contactor prevent re close the breaker by close push button after if it already close.
20. Tell me why the capacitors works on ac only?
Generally capacitor gives infinite resistance to dc components(i.e., block the dc components). it allows the ac components to pass through.
21. Tell me what Do You See as the Most Critical Skills for Electricians?
The goal of asking this type of question is to see if you have a clear understanding of what it takes to work successfully as an electrician. In addition to listing the skills, give examples that illustrate you possess them and apply them in your work.
22. Tell me what is ACSR cable and where we use it?
ACSR means Aluminium conductor steel reinforced, this conductor is used in transmission & distribution.
23. Tell us what is meant by armature reaction?
The effect of armature flu to main flux is called armature reaction. The armature flux may support main flux or opposes main flux.
24. Tell me where should the lighting arrestor be placed in distribution lines?
Near distribution transformers and out going feeders of 11kv and incomming feeder of 33kv and near power transformers in sub-stations.
25. Explain what is the one skill that you have to offer that you are really proud of?
I am great with troubleshooting. Since a large part of my work is to handle and fix problems with electronic equipment, this skills comes in handy at a great level.
26. Tell me what is the full form of KVAR?
We know there are three types of power in Electricals as Active, apparent & reactive. So KVAR is stand for ``Kilo Volt Amps with Reactive component.
27. Tell me what is ferrantic effect?
Output voltage is greater than the input voltage or receiving end voltage is greater than the sending end voltage.
28. Please explain why Delta Star Transformers are used for Lighting Loads?
For lighting loads, neutral conductor is must and hence the secondary must be star winding. and this lighting load is always unbalanced in all three phases. To minimize the current unbalance in the primary we use delta winding in the primary. So delta / star transformer is used for lighting loads.
29. Tell us as an electronics technician, what have been your work responsibilities in the past?
I have been actively involved in laying out, building, testing, troubleshooting, repairing and modifying developmental and production electronic components and parts. Additionally, I have been responsible for adjusting, calibrating, aligning and modifying circuitry and components, and recording effects on unit performances. Also, I was responsible for writing technical reports and developing charts and graphs to illustrate assigned systems' operating characteristics and deviations.
The motor has max load current compare to that of transformer because the motor consumes real power.. and the transformer is only producing the working flux and its not consuming.. hence the load current in the transformer is because of core loss so it is minimum.
Isolators are mainly for switching purpose under normal conditions but they cannot operate in fault conditions .Actually they used for isolating the CBs for maintenance. Whereas CB gets activated under fault conditions according to the fault detected.Bus bar is nothing but a junction where the power is getting distributed for independent loads.
32. Please explain what are the different losses that occur in thyristor while operating?
Different losses that occur are
☛ a) Forward conduction losses during conduction of the thyristor
☛ b) Loss due to leakage current during forward and reverse blocking.
☛ c) Power loss at gate or Gate triggering loss.
☛ d) Switching losses at turn-on and turn-off.
I possess fundamental knowledge of electrical and electronic systems, along with deep insight into handling installation, calibration and testing of components, equipment and units. In addition to this, I am great at basic schematic reading and possess exceptional troubleshooting and repairing abilities.
34. Tell us what is the difference between synchronous generator & asynchronous generator?
In simple, synchronous generator supply's both active and reactive power but asynchronous generator(induction generator) supply's only active power and observe reactive power for magnetizing. This type of generators are used in windmills.
35. Tell me what is the difference between synchronous generator & asynchronous generator?
In simple, synchronous generator supply's both active and reactive power but asynchronous generator(induction generator) supply's only active power and observe reactive power for magnetizing.This type of generators are used in windmills.
