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Why do you use induction generators in wind generation rather than synchronous generators?
If you use synchronous generator... you need rotor to rotate always in synchronous speed... practically it s not possible always to produce that speed by air flow... Air flow always varies...But using induction generator, you need to get speed to make slip as positive value.. it is always possible...so induction generator is best one..
Does a induction motor need excitation?
The induction motor is the special kind of motor which runs below and above the synchronous speed. which the synchronous motor runs nearly equal the synchronous speed. The operation of synchronous motor runs with dc field excited hence separate dc field current is given to the field circuit. where as the induction motor the field and main field is drawn from the same supply hence no excitation is required. But due to this separate starting mechanism has to be required in case of the single phase induction motor.
Why induction motor speed is always less then synchronous speed?
induction motor never runs at synchronous speed, if it does so there would not be any relative speed between stator flux and rotor and no emf will induce in rotor and we can not apply motor principle as we need current carrying conductor in magnetic field.
When the induction motor working as induction generator?
An induction motor connected to an existing ac supply normally runs at less than the synchronous speed by an amount described as the 'slip' which is proportional to the torque demanded at the shaft. If the same motor is instead coupled to an engine and driven at a speed higher than the synchronous speed, with negative slip, power then travels back into the ac supply and the motor has become a generator. The amount of power produced depends on the speed. However a normal induction motor will not behave as a stand-alone ac generator. For ac power generation synchronous generators are invariably used because it is necessary to set and maintain the frequency of the supply accurately.
Why 3 phase induction motor is self starting but synchronous motor is not?
the induction motor as soon as you turn on the power the rotating magnetic field is set up. the shorted winding in the squirrel cage see this and builds up a temporary magnet when its up to synchronous speed there is no longer current in the shorted winding in a single pole motor 60hz this speed is 3600 rpm depending on coupling and skew induction motor is always less than synchronous speed. the synchronous motor as soon as you turn on the power the rotating magnetic field is set up the permanent magnet 0 to 3600 rpm in 1/60th of a second this requires all the power you can deliver until you reach synchronous speed a bit hard on the power source smaller synchronous motors sometimes have a squirrel cage and permanent magnets and enough impedance so they dont put a heavy load on the power electric clocks have the shorted windings on the poles self starting hi impedance some older electric clocks didnt have the shorted windings and need to be nudged to get then spinning
Why is it necessary to synchronize mutiplexer and demultiplexer in time division multiplexing?
It is necessary to synchronize the mutiplexer and demultiplexer in time division multiplexing because the multiplexor is encoding data onto the carrier at certain points in time. (This is why its called Time Division Multiplexing) The demultiplexor most know when the data of interest are present in the carrier, hence the need for synchronization. Note that there usually is a transmission delay between the multiplexor and demultiplexor. As a result, while the demultiplexor is in sync with the multiplexor, it is not necessarily in phase. The crucial point is that the data and clock be in sync and in phase at the demultiplexor.
Why we need Wave Division Multiplexing?
We need Wave Division Multiplexing (WDM) to increase the capacity of fiber optic communication systems by transmitting multiple signals simultaneously over a single optical fiber. This allows for efficient use of the existing infrastructure and enables higher data transmission rates without laying down additional fibers. WDM is essential for meeting the growing demand for bandwidth in modern communication networks.
How many flipflop are required to generate a 7 Hz pulse from 56 Hz pulse?
To generate a 7 Hz pulse from a 56 Hz pulse, you would need to divide the frequency by 8. You would require at least 3 flip-flops to achieve this division by 8.
What equipment would you need to take a brachial pulse?
You don't need equipment to get the brachial pulse.
What changes do you need to look out for when monitoring a child's pulse?
How do you monitor a child's pulse
What will an infant in need of CPR show?
An infant in need of CPR will show no movement, breathing, or a pulse.
What observations should be noted and recorded when you take a patient's pulse?
When taking a pulse you need to pay attention to the rate of the pulse (how fast/slow?) and the quality of the pulse (how weak/strong?).
What qualifications do you need to be a cook in the army?
A pulse
What do you need to work at papa johns?
A pulse..
Why do nurse need to find the average pulse rate?
to see if the pulse rate is beating at a normal rate
How you do Speed control of permanent magnet synchronous motor?
To vary the speed of a permanent magnet synchronous motor, you need to vary the frequency of the AC power source. Of course, this also means you need to vary the voltage because the power factor is going to change, and you need to compensate for that or you might damage the motor.
How do you disable a factory alarm for a Nissan Xterra 2000?
You need to send a single pulse on the unlock wire. I forget what color it is. Xs need a double pulse to unlock.
