How Does a Battery Work?

Wednesday, August 5, 2009

Interview Question:How Does a Battery Work?

and How does a battery charge?

Answer:

Battery has got two leads,one positive and other negative.Electrons gather at the negative terminal of the battery and if you connect a wire across negative to positive,then the electrons from negative end will quickly flow through the wire to the positive terminal.Normally you will have a load connected in the wire which reduces the flow of electrons like a bulb or motor.

Working

Inside the battery itself, a chemical reaction produces the electrons. The speed of electron production by this chemical reaction (the battery's internal resistance) controls how many electrons can flow between the terminals. Electrons flow from the battery into a wire, and must travel from the negative to the positive terminal for the chemical reaction to take place.

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Difference between megger and earth tester?

Friday, July 24, 2009

Interview Question: Difference between megger and earth tester?

Answer: 

Megger is an instrument which in addition to measurement of high resistance can be used to test the quality of the insulation at or above its operating voltage. whereas earth tester is used to measure low earth resistance.

Megger is used for measuring an insulation resistance of motor winding of cable etc. which is measured in megaohm. While earth tester has earth electrodes which are used to measure eathpit resistance & it is measured in ohm.

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HR Interview Questions For Electronics/Instrumentation Engineers

Thursday, July 16, 2009

HR Interview Questions For Electronics /Communication /Instrumentation Engineers

1.) How much salary you’re Expecting?
Answer : I would expect a salary which reflects the experience and qualifications that I bring to the role.

Alternate Answer : Based on the information I have about the position, a salary in the range 15,000 - 18,000 would reflect the experience and expertise that I would bring to the role.

2)Why did you take Instrumentation as your branch in Engineering?

Answer:After having passed my class 12th examination,I actually didn’t have any idea about what was involved in Instrumentation.But I wanted to built my career around something from where we could control and monitor a whole industry.

3.) What kind of person would you refuse to work with?
Well, I am a person, who can work with all kinds of people. However, I feel bit uncomfortable to work with persons of selfish and ingratitude in nature.


4.) What have you done to improve your knowledge in the last year?
Every should learn from his mistake. I always try to consult my mistakes with my kith and kin especially with elderly and experienced person.

5.) What is more important to you: the money or the work?
Money and work both are like siblings. But I believe when you work hard; money will flow to you. So work is more important than money. Only hard work can help you put another feather in your success cap.

6.) Why do you want to join in industry?
industry is a place where the graduates have the opportunity to apply their skills n knowledge which they learn from their respective institutions. so feel industry is a best way for a person to applying their practical knowledge.

7.) Are you a team player?
while answering this question, try to keep yourself on both sides. For example, if the interviewer asks if you prefer to work alone or on a team, he may be trying to get you to say you are one way or the other. But you don't have to play this game. The reality is that most jobs require us to work both independently and in teams. Your response to this question should show that you have been successful in both situations or (In case you don’t find yourself comfy with team work say this) - I believe in individual work recognition [this would not put your weakness in front of others that strongly, Remember people who take interviews are super masters, do not fool them]

8)What is your greatest strength?

My greatest strength includes my analytical approach, my strong logics and my patience

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Difference between electrical and electronics?

Wednesday, July 15, 2009

Interview Question:

What is the main difference between electrical& electronics? Define them.

Answer:

In Electronics, as we study about the motion of electrons in the semi conducting materials, the currents and voltages are of very negligible values. With the less amounts of current and voltages we are able to perform many tasks using Electronics.

Where as in electrical, it is the study of motion of electrons  in metals.So, usually the conductivity is more for metals, so more voltage of order 230v and more currents of higher order amps are used.

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Job Inspirational Quotes

"You cannot be successful in any business without believing that it is the greatest business in the world. You have to put your heart in the business and the business in your heart"

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How to Calibrate Control Valve? Which Instrument is Used?

Friday, July 3, 2009

Interview Question: How to Calibrate Control Valve? Which Instrument is Used?

Interview Answer:

For the calibration of a control valve a loop calibrator or a pressure calibrator can be used between 3-15psi.Check the valve position for 3psi which is to be 0 for a NC type valves.In such manner check the valve position for various ranges(6psi,9psi,12psi & 15psi).the valve position should be 0 for 3psi and 50% for 9 psi and completely opened for15psi.

The same procedure is applicable for NO type valves.The valve is open for 3 psi and completely closed for 15psi.Any errors occurred may be rectified by Zero span adjustment.

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Why is Flow measure in Square-root?

Interview QUestion: Why is Flow measure in Square-root?

Answer: Where orifice plate is used to measure flow alone, the signal is square rooted. it is by the formula Q=K (squareroot of Differential pressure). If other types of FT are used then the signal from that FT need not to be square rooted.

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