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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
What is Hash file organization in DBMS?
Hashing is the most common form of purely random access to a file or database. It is
also used to access columns that do not have an index as an optimisation technique.
Hash functions calculate the address of the page in which the record is to be stored
based on one or more fields in the record. The records in a hash file appear randomly
distributed across the available space. It requires some hashing algorithm and the
technique. Hashing Algorithm converts a primary key value into a record address. The
most popular form of hashing is division hashing with chained overflow.
What are Hysteresis motor applications?
APPLICATIONS TYPIQUES
- Broches de perçage pour matières plastique
- Centrifugeuses
- Pompes à ultravide
- Moteur de gyroscope
- Enregistreurs et lecteur vidéo
- Balayage optique
- Scanner code à barres
- Phonographic appliances
Why can the neutral wire diameter be reduced in relationship to the phase wires?
The Neutral wire should be the same gauge and size of the phase wires. Only the Earth or Equipment wire can be smaller than the phase(hot) wires.
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On a three phase four wire distribution system the neutral can be reduced in size. The neutral only carries the unbalanced load current and should be sized to that current. The highest current load to neutral of the three legs is used to calculate the neutral sizing. There is no reduced neutral allowed on discharge lighting and non linear loads. A demand factor of 70% shall be permitted to be applied to that portion of the unbalanced load in excess of 200 A.
What does a flux density do in a single phase tramsformer?
Answer for USA, Canada and countries running a 60 Hz supply service.
In an AC system the voltage alternates 120 times a second. This alternation causes the magnetic field that surrounds the wire in the primary coil to rise and collapse along with the voltage. This magnetic field is also known as magnetic flux. When the flux collapses and rises in the primary winding of the transformer this flux cuts the secondary coils and induces a current to flow in the secondary winding of the transformer. Depending on the amount of coil turns in the secondary, the AC voltage can be higher (step up) or lower (step down) than the primary voltage.
What is the difference between the max power and max torque of a four stroke engine?
http://www.greenspun.com/bboard/q-and-a-fetch-msg.tcl?msg_id=00ClSS
Why full eave rectifier rectifies negative half cycle?
the rectifier is Mainly used to convert the Ac current into DC current .In rectifier there are two diodes or (4 Diode In full wave bridge rectifier )are use is to conduct the current one is connected in forward bias(i.eD1) and the other is connected in reveres bias(i.eD2). As we know that the diode is conduct the current throw it When it is connected in forward bias . now when the voltage is applied to the circuit the the AC Current is start to flow throw circuit and in Positive half cycle of Ac current the Diode is Allow the current Pass throw it and during the Negative half cycle the Diode D2 is allow the current pass throw it and in these way the rectifier rectifies positive As Well As the negative half cycle
Why inductance value is negative?
Inductance is not negative. It is measured in henrys, and that is a positive value. Inductive reactance, however, is measured in ohms, and is commonly shown as negative to indicate that the current lags the voltage.
a) Put 2 of the resistors in series to make a 200 ohm resistor. Then put the 100, 100, and 200 ohm resistors in parallel for 40 ohms. b) Put 2 resistors in parallel for 50 ohms. Put the 50, 100, and 100 ohm resistors in series for 250 ohms. c) Put 2 resistors in parallel for 50 ohms. Repeat with other 2 resistors. Put the two 50 ohm resistors in series for 100 ohms. This configuration can withstand 4 times the wattage of each individual resistor.
Advandage and disadvandage of berry transformer?
Berry transformer has good ventilation provision as compared to other types of transformer
What frequently results in negative frame sequence checks?
The result of the CRC generated by the originating node not matching the check sum calculated from the data received. It usually indicates noise or transmission problems on the LAN interface or cabling.
D: Noise
In synchronous motor hunting can be minimized using flywheel to the shaft .
What is the potential voltage?
Unless you are using 'potential' in the general sense (i.e. "What is the possible voltage?"), there is no such engineering term as 'potential voltage'. Voltage is a synonym for 'potential difference', so your expression would then mean "What is the potential potential difference?"
Do not mix up 'potential' with 'potential difference' (voltage); they are two different things.
What is difference between in digital and Numerical Relay?
They seem to be the same thing. Such a device is a protective relay. It uses a microprocessor to analyze power system voltages, currents or other process quantities for the purpose of detecting faults in an industrial process system.
IP3 means 3rd-order intermodulation products. When an amplifier is not perfectly linear it distorts the incoming waveform and if signals are input at two frequencies f1 and f2 the basic intermodulation products are at the two frequencies f1±f2.
3rd-order products are f1±2f2 and 2f1±f2. This gives problems because when f1 and f2 are almost equal, there are 3rd-order products that are close to them in frequency and therefore difficult to filter out.
How do you know transformer bad or good?
To determine if a transformer is functioning well, you can assess its performance metrics, such as efficiency and output voltage stability, and check for any unusual sounds or overheating. Additionally, performing routine maintenance and inspection for physical damage or signs of wear can help identify potential issues. If the transformer meets operational specifications and shows no signs of malfunction, it is considered good; otherwise, it may be deemed bad. Regular testing and monitoring are essential for ensuring reliability.
A Step-Up Option is a type of derivative in which the option's strike price resets when knocked in. For example, a long, at-the-money step-up put on a market with a spot price of 100 could have a reset strike every 10 points. When the market hits 110 your strike price steps up to 110.
This will make this put more expensive than a plain vanilla put since your protection level is raised as the market moves away from your original level.
