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Q. emf produced by windings?
The time variation of emf for a single conductor corresponds to the spatial variation of air-gap flux density. By suitable winding design, the harmonics can be reduced appreciably, and the waveform of the generated emf can be made to approach a pure sine shape.
Figure shows an elementary single-phase, two-pole synchronous machine. In almost all cases, the armature winding of a synchronous machine is on the stator and the field winding is on the rotor, because it is constructionally advantageous to have the low-power field winding on the rotating member. The field winding is excited by direct current, which is supplied by a dc source connected to carbon brushes bearing on slip rings (or collector rings). The armature windings, though distributed in the slots around the inner periphery of the stator in an actual machine, are shown in Figure (a) for simplicity as consisting of a single coil of N turns, indicated in cross section by the two sides a and -a placed in diametrically opposite narrow slots. The conductors forming these coil sides are placed inslots parallel to the machine shaft and connected in series by means of the end connections.
The coil in Figure (a) spans 180° (or a complete pole pitch, which is the peripheral distance from the centerline of a north pole to the centerline of an adjacent south pole) and is hence known as a full-pitch coil. For simplicity and convenience, Figure (a) shows only a two-pole synchronous machine with salient-pole construction; the flux paths are shown by dashed lines. Figure (b) illustrates a nonsalient-pole or cylindrical-rotor construction. The stator winding details are not shown and the flux paths are indicated by dashed lines.
The resistance of a wire is 60 ? at 25 o C and 65? at 75 o C. Find the resistance of wire at 0 o C and value of temperature co-efficient at 0 o C. Ans: Given R 25 = 60 ? a
Property of material which allows it to be drawn out into wires is (A) Ductility. (B) Solder ability. (C) Super conductivity.
Q. Some element voltages and currents are given in the network configuration of Figure. Determine the remaining voltages and currents. Also calculate the power delivered to each el
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Disadvantages of SDR 1. Power consumption is more due to rapid switching of modes 2. Hardware design is not easy 3. Software bugs exist in the system
what is feedback?
The original 8086, which only had 1 MB of memory. This megabyte is dividing into low memory for IRQ tables, application memory and high memory.
matlap code to solve the fast decoupled method
Q. Advanced Mobile Phone System? Cellular systems employed cells with a radius in the range of 5-18 km. The base station usually transmitted at a power level of 35 W or less, a
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