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What are the minimum amount of winding of coil for inductive coupling to take place between two metal coils?
Not even a single turn, just having two wires "near" each other will cause some inductive coupling between them. This is one of the causes of "crosstalk" that causes signal to appear in weakened form on wires they don't belong on (the other cause is capacitive coupling, which is also present between any two wires "near" each other).
The real matter is how much coupling you want (or can tolerate, if you don't want coupling).
What else can I help you with?
What is the mutual coupling in single phase transformer?
primary winding flux links with secondary winding produses voltage across the secondary winding
Why is it important that the core of a transformer pass through both coils?
If it doesn't, you don't have a transformer. The core is where the magnetic flux will pass, which induces voltage on the secondary (voltage applied to the primary winding induces a magnetic flux in the core, which induces a voltage on the secondary winding); If the core is not passed through one coil, it will not induce a voltage in that winding. Leakage flux outside the core can result in some inductive coupling, but the job of the core is to couple the primary winding to the secondary winding.
What kind of AC load uses the energy needed to magnetize a motor or a transformer winding?
inductive load
WHAT STOPS a transformer windings FROM BEING A short circuit?
The transformer winding is a short circuit to DC. But for AC, the impedance of thecoiled winding and the magnetic coupling to another winding have the same effecton AC as resistance has in a DC circuit. That's why transformers don't work withDC, and are always operated with AC.AnswerIf you are querying why there are no short circuits between individual turns, it is because the windings are insulated not bare.
What is the significance of Synchronizing Power Coefficient?
The measurement of stiffness of the electromagnetic coupling between the rotor and the stator is carried out by the synchronizing power coefficient. If the value of Psyn is large, the coupling is stiff or rigid. For a too rigid coupling, with change of load or supply, the machine will be under shock which may damage the rotor of the winding
What happens when the primary winding is energized and the secondary winding is open circuited?
A voltage appears between the terminal points of the secondary winding
When dc voltage is supplied to the primary coil of the transformer then the voltage be induced in secondary or not?
The windings of a transformer have both resistance and inductance. When you apply an AC voltage to the primary winding, the opposition to current flow is a combination of resistance and inductive reactance; although the resistance of the winding is relatively low, its inductive reactance is high. The resulting impedance (the vector sum of resistance and inductive reactance) will, therefore, be high and the resulting current will be low.If, on the other hand, you applied a DC voltage to the winding, the only opposition will be the low resistance of the winding. So, if the value of DC voltage is roughly the same as the rated AC voltage, a large value of current would result -high enough to probably burn out the winding.Since transformers work on the principle of mutual induction, a fluctuating magnetic field is necessary to induce a voltage into the secondary winding. Since a fluctuating magnetic field requires a fluctuating current, a transformer will only work if an AC voltage is applied to its primary winding.So, not only will a transformer not work when a DC voltage is applied to its primary winding, it will probably burn out the primary winding.
What are the specialised transformer test as regard designperformance and operation of a polyphase transformer after manufacture?
first is isolation test with 4.5 kv or above as per the custumer had asked between primary and secondary.also to find the leakege inductance its test is required for both primary and secondary.find the megnetising inductance between two winding(or say coupling )
What is difference between main winding and auxiliary winding?
In the case of a capacitor-start/run single-phase induction motor, the main field is provided by the main (running) winding, and the capacitive branch is the auxiliary winding. In the case of a capacitor-start motor, the main winding is the running winding and the auxiliary winding is the starting winding.
How does a star winding shifts to a delta winding in a three phase motor?
To shift from a star winding to a delta winding in a three-phase motor, the connections between the windings need to be rearranged. In a star winding, the ends of the windings are connected to a common point (neutral), while in a delta winding, each winding end is connected to the start of the next winding. By physically switching the connections, the motor can be reconfigured from star to delta winding.
What is the difference beteween solenoids and Toroids?
A solenoid is a coil of wire wound in a helix shape, often used to generate a magnetic field when current flows through it. A toroid is a coil of wire wound in a doughnut shape, with the wire passing through the center hole, typically used to create a more uniform magnetic field or for inductive coupling. Toroids are often preferred for certain applications due to their shape and magnetic properties.
What is the advantage and disadvantage of wave winding?
Advantage: Wave winding provides a higher voltage output compared to lap winding with the same number of turns in the armature. This winding type also allows for better cooling due to the interleaved nature of the winding. Disadvantage: Wave winding is more complex to construct and repair compared to lap winding. It also requires more insulation material between the turns, which can increase the overall size of the winding.
