Important points of Electrical Engineering

Important points of Electrical Engineering

* An ideal voltage source will charge an ideal capacitor INSTANTANEOUSLY.
* A series RLC ckt Below resonant frequency is CAPACITIVE.
* A series RLC ckt Above resonant frequency is INDUCTIVE.
* Conductive is the reciprocal of RESISTIVE..
* Transformer action requires a Alternating Magnetic Flux.
* In An oil Fill Transformer oil is provided for both Cooling and Insulation.
* Admittance is the reciprocal of IMPEDANCE.
* An ideal op-amp is a voltage controlled voltage source.
* Negative feedback in an amplifier is reduces gain.
* An Oscillator is a device which generates an alternating voltage.
* Fundamental frequency of the crystal oscillator f= k/t
* 3ϕ synchronous motor is a doubley excited motor. induction motor is singly excited.
* IN KANDO SYSTEM, the Single Phase Supply is Converted into Three Phase System
* In Gas Welding, the gases used are Acetylene and Oxygen
* Field control Above base speed.
* Armature control Blow base speed.
* A Rotating amplifier that can be used as a constant current source is metadyne.
* Always comparator works under open loop systems.
* For ideal op-amp slew rate is infinite. For practical op-amp slew rate is 80 v/µ.
* Time base generators are used in CRO’s, TV and Radar systems.
* The Q of a crystal is of the order of 1000.
* Sinusoidal oscillators work on the principle of Barkhausen Criterion.
* The condition of oscillation and frequency of oscillation depend on the principle known as Barkhausen Criterion.
* Cross over distortion behavior is characteristic of Class-B.
* Class –A power amplifier systems are non linear device.
* Rectifier is a device which converts the sinusoidal AC voltage into pulsating DC.
* In a transformer the thickness of laminations varies from 0.35 mm for a frequency of 50Hz to 0.5 mm for a frequency of 25Hz.
* The All day efficiency is always less than the commercial efficiency of an X’mer.
* The world first 5000 KVA amorphous transformer commissioned in august 2001 in Japan.
* A transformer transforms Voltage and Current.
* Large scale generation of electric power is usually 3-phase at generated voltages of 13.2 kV or somewhat higher.
* Frequency change 50Hz to 100Hz then string efficiency is Unchanged.
* In 132kV transmission line the disc type insulator is used