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Explain Eddy currents.
Eddy currents: Magnetic materials placed as in alternating magnetic fields have eddy currents also induced in them. It is because the material is subjected to rate of change of flux linkages and change in accordance along with Faraday's Law of electromagnetic induction, emfs are produced in the material causing currents, termed as eddy currents, to flow in the material. Such currents cause loss of energy. It results in the heating up of the material. Loss of Eddy current is proportional to the square of the frequency and the square of the thickness of the material and its inversely proportional to the resistivity of the material. So as to reduce this eddy currents loss thin sheets termed as laminations are used instead of solid core.
\ Transistor voltmeter (TVM) : a simple diagram of TVM using two transistors in the bridge configuration is as shown. TVM is provided by using transistor bridge circuits. In b
Voltage is referred as Potential difference among two points. Potential means its force. I think so.voltage defination is 100% correct.
Q. Draw the various characterstics of a DC shunt generator and explain critical resistance. Sol. Following are three most important characterstics or curves of a d.
Responsibilities of Regulatory Body The basic responsibilities of the Central Regulatory Commission are to: Fix tariff of Central Sector producing plants as well as of
A three-phase, six-pole, wye-connected synchronous generator is rated at 550 V and has a synchronous reactance Xs = 2 . When the generator supplies 50 kVA at rated voltage and a p
Q. A transmitter is connected to an antenna by a transmission line for which ¯ Z 0 = R 0 = 5 0 . The transmitter source impedance is matched to the line, but the antenna is kno
In Microprocessor more op-codes, few bit handling instructions. But in Microcontroller: fewer op-codes, more bit handling Instructions, and also it is described as a device that ha
Q. Show the Amenability to computer processing? Due to the digital data collected and stored in the form of a matrix, the same becomes amenable to processing on computers. By f
Q. Write a note on clampers ? Clamper is a circuit that "clamps" a signal to a different dc level. The different types of clampers are positive negative and biased clampers.
What is resistivity? Resistivity of a material may be explained as the resistance of the material having unit length and also unit cross sectional area. Unit of it is ohm-m.
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