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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
Advantages of open loop control system?
- The open loop system is simple and economical
- easier to construct
- stable
Are Inductor and Capacitor impedance in phase when a resonance frequency is reached?
Not at all..bcoz den da phenomenon of resonance itself will not occur..Look,resonance occurs wen inductive and capacitive reactance cancel out each other,i.e. the magnitudes of inductive and capacitive reactances are equal but they are 180deg out of phase with one other. Under resonance:: jwL=1/jwC BY...Rahul
Can you wire lighting fictures to receptical circuits?
Yes as long as you stay within your local code. Usually a combination of lights and receptacles cannot exceed ten total. Do not wire any light to a circuit that requires a dedicated circuit, such as a refrigerator, dishwasher, etc.
What does it mean to say that an operation is commutative?
It means the operation has two sub-operations and it does not matter in which order they are done. An example is the addition of two numbers (but not the subtraction).
For example, 2+1=3, but also 1+2=3 so adding 1 and 2 is commutative.
How will you test starter and choke in fluorescent tube?
You can use a wire instead of the starter to test the tubes .. I did it, it works !
What is Shearing mechanical process?
shearing mech. process is done by a machine known as shearing machine in which a sheet of alluminium or some other metal is cutted down in between the blade of the machine, and this process is known as shearing process.
4 what is the name of the circuit that adds a positive or negative dc voltage to an input sine wave?
This DC voltage is called the DC offset. Any decent signal generator will be able to add DC offset to the signal it generates. If you don't have one, simply connect a DC voltage to your signal.
What is concentric cable transmission line?
It is a shielded high voltage cable made up of center conductor with the next layer being a semi-con layer followed by a insulation layer with another layer of semi-con wrapped with a copper stranded ground and covered by a protective jacket. It is usually three wires, each carrying a phase of the three phase primary that most power companies generate today.
What are the characteristics of transmission line?
In general the conductor materials used for transmission and distribution of electrical power must have the following characteristics
1. High electric conductivity
2. Low specific gravity in order to give low weight per unit volume
3. High tensile strength in order to withstand the mechanical stress
4. Cheap and easily available
5. Should not be brittle
What is the difference between voltage and emf?
E.M.F: Is the potential difference between two terminals when there is no current i.e. circuit is open, therefore [EMF = OCV].
OCV :open circuit voltage.
Voltage: Is the potential difference between two terminals when there is current i.e. closed loop
AnswerAn e.m.f. (electromotive force) is a voltage or, more accurately, a potential difference ('voltage' is simply another word for 'potential difference'). However, it is the potential difference that appears across the terminals of a supply when it is not connected to its load. When the supply is connected to a load, this potential difference falls because of an internal voltage drop across the supply's internal resistance. So the simple answer is that an electromotive force is a supply's open-circuit terminal voltage.
Another definition is obtained from Kirchhoff's Voltage Law, from which we can say that an electromotive force is equal to the sum of all the all the voltage drops around the circuit, including its internal voltage drops.
What do you increase by using more cells?
What is the applied voltage on a circuit in which 5A is flowing and 10 w is generated?
- POWER, P=V*I
- if, P=10w,I=5A
- P=>10W = V * 5
- 10=5V
- V=2volts
What is an electrical star delta configuration?
A star configuration of the windings in a 3-phase transformer or motor is where one end of each winding is connected to form a star or 'Y' pattern and the other ends are each connected to one of the three separate lines of the incoming 3-phase electrical service.
A delta configuration is when each phase winding of a three phase transformer or motor is connected to its two adjacent phase windings to form an arrangement that looks like the Greek letter delta - or triangle - and then each point of the triangle is connected to to one of the three separate lines of the incoming 3-phase electrical service.
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To be able to wire a 3-phase transformer or motor either in star or delta, all 6 ends of the three sets of coils, called "windings", have to be exposed with suitable connection terminals.
The windings are often labelled A1, A2, A3 and B1, B2, B3, where "1", "2" and "3" denote the separate phase windings and "A" and "B" denote the beginning and end of each winding.
Another way of describing it is to say that the separate windings can be labelled:
Winding 1: A1 <---> B1. Winding 2: A2<---> B2, Winding 3: A3 <---> B3.
In star configuration either all the A's or all the B's are connected together and the 3-phase supply (consisting of three separate "phase lines" labelled L1, L2, L3) is connected to the remaining three connectors. For example, if you connect B1 to B2 and B2 to B3 to form the center of the "star" then you must connect supply L1 to A1; supply L2 to A2 and supply L3 to A3.
In delta configuration, connect B1 to A2, B2 to A3, B3 to A1. (If you draw that out as a schematic diagram, it will be a triangle.) Then connect supply L1 to A1; supply L2 to A2 and supply L3 to A3. (Exactly the same as the supply lines were connected before, for the star configuration.)
For more information see the answers to the Related Questions shown below.
Is step signal is a DC signal?
A: while a step can be of both polarity but it is a level change and it is DC LEVELS
What is it called when voltage is lost across a portion of a circuit?
This is often called a "voltage drop".
One ohm.
What are people from dc called?
People that are from Washington D.C. are called Washingtonians. Washington D.C. can be called Washington, DC, as well as the District.
voltage transfer without using step up t/f &conventional generator
What does a primary substation do?
Primary substation - when the transformer is HV/MV or MV/MV. e.g. substation designed for 132kV/33kV or 230kV/22kV or 33kV/11kV etc
stepped down for MV distribution (mainly for utilities and heacy industries)
Secondary substation - when the transformer is HV/LV or MV/LV. e.g. substation designed for 11kV/400V or 6.6kV/400V etc
stepped down for LV distribution (mainly for residential, commercial) sometime referred to as a kiosk substation.
Why low voltage winding placed near core?
if H.V winding is placed in inner side,then insulating cost and fault occuring posibility is more.and it required a thick insulator which occupy a large area is not possible in inner side.so
