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Write a note on superconductors.
Superconductors- The resistivity of most metals rises with increase in temperature and vice-versa. Some metals and chemical compounds are there, whose resistivity becomes zero while their temperature is brought near 00Kelvin (-2730C). At that stage these metals or compounds are be have attained superconductivity. Illustration - mercury becomes superconducting at about 4.5 Kelvin (-268.50C). Superconductivity was discovered through Heike Kamerlingh Onnes. The transition make normal conductivity to superconductivity takes place almost rapidly; this occurs over a very narrow range of temperature regarding 0.050K. The temperature at that the transition takes place from the state of normal conductivity to that of superconductivity is termed as transition temperature. Superconductors are utilized for producing very magnetic fields of approximately 50 Tesla. Magnetic energy can be stored in huge superconductors and drawn as needed to counter the voltage fluctuations throughout peak loading. Superconductors can be utilized to perform logic and storage functions in computers. Since there is no, I2R losses in a superconductor, therefore power can be transmitted by the superconducting cables without any losses. Superconducting property can be vanished by applying external magnetic field as in figure (b). In figure (b) HC is critical magnetic field and TC critical temperature.
Armature Winding In this winding the working emf is induced by the working flux. The current which is dependent on the load called current. The windings that handle
Q. Show Applications for Synchronous Motors? With constant-speed operation, power factor control, and high operating efficiency, three-phase synchronous motors are employed in
Holding current The holding current is the value of on state current required to maintain conduction once the device the device has fully timed on and the gate
Q. Aconical horn has a side viewas shown in Figure The maximum value ofthe directive gain is given by GD ∼ = 5.13(D/λ) 2 , where D =√3.33λL1 and L1 = L/(1-d/D),in which d is the i
Q. A current i(t) = 20 cos(2π × 60)t A flows through a wire. Find the charge flowing, and the number of electrons per second that are passing some point in the wire.
Explain ferrites and its uses in high frequency devices. A group of magnetic alloys show the property of magnetisation that change, with percentage of various constituent atoms
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Saturation or active mode While V GS > V th and V DS > (V GS - V th ) The switch is turned on, and a channel has been made that allows current to flow
Asset information management system: GIS has the potential to revolutionize the reform procedure in areas such as consumer indexing, asset and work management, distribution ne
Explain the factors affecting permeability and hysterisis loss. Factors affecting permeability and hysterisis loss: When the initial permeability is high, the hysterisis los
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