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D.C. Generator
A magnetic field is produced by afield coil supplied with a D.C. current and a rotor is placed between shaped pole pieces and wound with an armature winding. The diagram above shows only one turn of the armature winding, but in practice there will usually be more than one. The ends of the armature winding are connected to two slip rings that rotate with the armature and the voltage generated is 'picked off' the rings by brushes that bear against the slip rings
The emf generated may be calculated either using the equation for the emf induced in a conductor of length l moving
in an electric field of flux density B webers/m 2
e=B.l.v
with a velocity v m/sec or by considering the rate of change of flux linkage with the armature coil. We shall use the latter method. Due to the shaping of the pole pieces, the flux threading through a particular armature coil is constant at + max as it turns from O4 to O1 and decreases linearly from +Ømax to -Ømin while the rotor is turning from O1 to O2 . It is constant again during O2 to O3 and then increases linearly during O3to O4. (ref graph)
ppt needed
With a maximum excess delay of and a chip duration of , the multipath components fall in delay bins. This means that we experience leakage of energy between chips and the channel i
Q. Use (a) mesh analysis and (b) nodal analysis to determine the current through the 4-resistor of the circuit of Figure.
This is at the heart of the analysis of electromagnetics. It is based on a series of experiments conducted by the French scientist Ampere (1775 - 1836), in which the force between
For a helical antenna, the half-power beamwidth and directive gain are given by where C = πD, N = L/S, and S = C tan α,in which α is called the pitch angle, and The
Negative Voltage Regulator series with Nine voltage options - IC 7900 Series The IC 7900 series of fixed output negative voltage regulators are complements to the 7800 seri
3-Phase 4 Wire Meters with CT and MD If load is commonly more than 50 A, CT operated meters should be used. It is to be remembered that CTs should be properly selected for acc
Q. A transistor in a fixed bias amplifier circuit was replaced by another transistor of beta equaling 150 instead of 60.if IB of transistor is equal to 100 microampere and collecto
three application of microprocessor
Q. Consider two 1-C charges separated by 1min free space. Show that the force exerted on each is about one million tons.
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