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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)
Define Johnson Counters to Make Simpler Combinational Logic? The ring counter technique able to be efficiently utilized to implement synchronous sequential circuits. A main pr
2+7
derive transfer function of S= 2.25+j4.5
Draw the state diagram for the state machine described by Table 7.5 in the text. Note, the table shows the transition to the next state S* from the current state S for the next set
Design a logic circuit when to provide an output when any two or three of four switches are closed.
Q. Determine the Thevenin resistance viewed from terminals A-B of the circuit of Figure by setting independent sources to be zero and applying a test voltage at terminals A-B.
Q. For DSB and conventional AM, obtain expressions for the in-phase and quadrature components x d (t) and x q (t), and envelope and phase v(t) and φ(t).
Q. What is meant by thermal runaway in a transistor ? When current flows through the collector circuit, it produces heat at the collector junction. This increases the temperatu
Determine the signal bandwidth and the amplitudes, Computer Networking
What are the features used mode 1 in 8255? Two groups - group A and group B are available for stored data transfer. 1. Each group have one 8-bit data I/O port and one 4-bit
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