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Q. Nonsalient-pole rotor construction?
The nonsalient-pole (smooth or cylindrical) rotor construction is preferred for high-speed turbine-driven alternators (known also as turbo alternators or turbine generators), which are usually of two or four poles driven by steamturbines or gas turbines. The rotors for suchmachines may be made either from a single steel forging or from several forgings shrunk together on the shaft.
The maximum value of the induced voltage is
which are identical in form to the corresponding emf equations for a transformer. The effect of a time-varying flux in association with stationary transformer windings is the same as that of the relative motion of a coil and a constant-amplitude spatial flux-density wave in a rotating machine. The space distribution of flux density is transformed into a time variation of voltage because of the time element introduced by mechanical rotation. The induced voltage is a single-phase voltage for single-phase synchronous machines of the nature discussed so far. As pointed out earlier, to avoid the pulsating torque, the designer could employ polyphase windings and polyphase sources to develop constant power under balanced conditions of operation.
Flow of electrons - Electrons flow down a wire that is what current, is. Good conductors like copper and silver and aluminum have free electrons in their outer shells, and they jum
key performance indicators
8 bit data to memory This form of the instruction is used to copy 8 bit data directly to the memory location pointed by register pair HL. The instruction format is
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
What is the Direction of a line of flux The direction of a line of flux is from the north pole to the south pole on the exterior of the magnet and is then supposed to continue
Each year the University computer society holds a „virtual fair? in Second Life in order to raise money for charity. The main attraction at the event is a lucky dip, where attendee
A burglar alarm system is controlled by a microprocessor system. The system has three independent circuit each consisting of 7 passive infra red sensors. The controller can be prog
Alow-noise transducer is connected to an instrumentation system by a cable that generates thermal noise at room temperature. The information-bearing signal has a bandwidth of 6 kHz
Induction motors are often braked rapidly by a technique known as plugging, which is the reversal of the phase sequence of the voltage supplying the motor. Assume that a motor with
(a) "Pulse Code Modulation (PCM), as used in telephony, samples a signal at 8 kHz using 256 quantization levels". i. Outline how this scheme works with the help of sketches and,
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