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Electrical Engineering

Electrical engineering is a field of engineering that deals with the study and application of electricity, electronics and electromagnetism.

23,056 Questions

Why Automatic Electric Iron is called closed loop system?

Because a negative feedback system "closes the loop" based on a temperature sensor in the tip of the iron. This makes the temperature of the iron nearly constant whether sitting idle on the stand or being used to solder a massive joint. Without this negative feedback the temperature of the open loop iron would rise significantly when sitting idle on the stand and fall significantly when being used to solder a massive joint.

Why do we use CT in a relay circuit?

CT is used in the relay circuits for protection purposes. As the current and voltage ratings in a power system are very high, it is not possible to measure currents and voltages of that magnitude as they are way too large for any meter of reasonable size and cost. The CT’s are generally standardized at 1 or 5 amperes secondary current. These are very moderate ratings, thus a 5 A ammeter can be used to measure 1000 amperes with the help of a 1000/5 A ratio CT. For this reason the relay circuits are connected with instrument transformers because the relay senses the input quantity before sending the trip signal to the circuit breaker, and these input quantities are measured by the use of instrument transformers.

Why transformer are rated in kVA instead of KW?

Transformers are rated in VA or kVA. That is because the voltage is limited by the power loss in the magnetic core, and the current is limited by the power loss in the resistance of the windings. The rated voltage times the rated current gives the transformer's rating in kVA.

What is the difference between type ac and type act armored cable?

The difference is the type of insulation on the conductors. Type AC used a thermoset

insulation , Type ACT is a theromplactic

insulation.

If You're Touching A Counter With My Left Hand And You Get Shocked With Your Right Hand Will The Electricity Travel To Your Left Hand If It's The Quickest Route To The Ground?

Most of the electric current will pass through the path through the body which offers the least resistance, NOT the 'quickest' path, as speed doesn't come into it.

What is the difference between chemical earthing and conventional earthing?

Chemical Earthing and Conventional Earthing are different types of earthing techniques. Conventional Earthing is based on plate earthing and pipe type earthing but Chemical Earthing on GI or Copper.

Can you feel 19 volts on your skin?

No. If you hear crackling when you take off a jumper made of artificial fibres, the voltage developed can be in the thousands. You might feel a sensation but there is no shock because there is no current.

What happen when slip ring induction motor overloaded?

Let me give you a different yet convincing answer, as you over load the machine, it will run slow to get more induced emf in rotor, we all agree to a point that,as it slows down it will have more emf but as the electrical angle increases beyond 90, for slipring machine with no automatically induced poles unlike cage rotor, this deter the flux bonding between stator and rotor , As already loaded , this is a cumulative action there by machine stalls,

Do let me know if you need further explanation.

What are the Relays in transformer?

There are many types of protection relays used in transformers depend upon its construction, size, use etc.

They are

1. Buchholz relay for incipient faults like short ciruit,

winding temparature protection, oil temparature protection,

oil level protection, oil pressure protection, Pressure

relief valve (for oil filled transformers)

2. Differential protection

3. Thermal Protection

4. Earth fault protection

5. Over current protection

6. Over excitation protection(where OLTC is used) etc

How does a DC brushless motor work?

To state it simply, a DC brushless motor is not a DC motor.

It is an AC motor with an inverter (or electronic commutator) on the front end to make the AC, so you can use a DC input.

Can thevenins's theorem be applicable in a network having nonlinear elements?

yes

Answer

No it cannot, any more than Ohm's Law can be applied to circuits with non-linear elements.

Will high voltage detox drink cover meth in a UA?

0 well I think it's funny is people in here who have never taken the detox cleanse in their life but act like your experts they need to do more research because you make yourself look dumb

What is the difference between a line isolator and a bus isolator?

If I'm interpreting the question accurately, a "line isolator" is an insulating standoff for transmission or distribution cable. A bus isolator is an insulating standoff for tubular or bar bus as is normally seen in a substation switching yard.

Why flux is coated on filler rod?

The flux is there to remove any oxidation from the surfaces of the metals to be welded.