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Magnetic circuits
To see how this is used in practice, consider a coil of N turns wound onto a closed ring shaped former with a very high
(note: r (steel) = 2000, r (silicon iron) = 7000, r (nickel) = 600).
A current I amps is passed through the coil, creating a magnetic field H within the former. The flux density is
webers/m2 and the flux is B.A ,where A i the area of the core. The flux density is mainly confined within the core because the core has a much larger than air. ( r>>1). Provided this is the case, then the flux density outside the core may usually be neglected in comparison.Because of its high , the former effectively 'guides' the flux around the loop in a similar way to current being guided around an electrical circuit by a high conductance (low resistance) wire.
Q. Working of On - off hook circuit in telephone hand set? On/off hook circuit (sometimes termed as a switch hook) is nothing more than a simple single-throw, double-pole (STDP
Standby mode:In this mode, one processor is active and other is on standby, both software and hardware wise. Standby processor brought online when active processor fails. A vital r
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Q. Show the procedure twos complement subtraction? Two's complement subtraction is the binary addition of the minuend to the 2's complement of the subtrahend (adding a negative
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Construction and working of calomel electrode
Q. A single-phase, 10-kVA, 2300:230-V, 60-Hz, two-winding distribution transformer is connected as an auto transformer to step up the voltage from 2300 V to 2530 V. (a) Draw a s
the base of isosceles triangle and the altitude drawn from one of the congruent sides are equal to 18cm and 15cm, respectively. Find the lengths of the sides of the triangle.
Q. Compare electromechanical switching system with electronic switching system. Sr. No Electromechanical switching System Electroni
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