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A moving coil galvanometer consists of a coil in a uniform magnetic field Bo, suspended fro a fibre of torque constant C, current I produces a deflection O=nABoi/c where n is the number of turns and A is the area of the coil. The period of oscillation T=2?(I/C)1/2 where I is the moment of inertia. The resistance of the coil and the circuit in which it is placed is adjusted to give a critical dumping Rc=n2 A2Bo2/2(ic)1/2 . if the minimum detectable current produces deflection equal to thermal -root mean square value O, show that minimum current is given by
imin =( ?KT/ TRc)1/2
Determine a normalized frequency at 820nm for a step index fibre having 25µm core radius. Given n 1 =1.48 and n 2 =1.46.Also calculate how several modes propagate within this fibre
Defective Metering and Meter Reading Errors Defective Metering Tampered, slow running, stalled, damaged meters are a cause of huge losses to the utility. The electromecha
Q. Calculate the stator input current? The parameters of the equivalent circuit shown in Figure for a three-phase, wye-connected, 220-V, 10-hp, 60-Hz, six-pole induction motor
Q. Define the spectral resolution of satellite? Spectral resolution : The sensitivity to different features of earth is the most important aspects considered in the spectral
What is the difference between “Insulating,” “Isolating,” and “Shielded Winding” transformers? Can Acme Transformers be reverse connected? . Can Transformers develop Three Phase po
how it occurs?
Technical Losses in Power Systems The technical losses in power systems occur because of energy dissipated in the conductors and equipment used for transmission, transformat
Q. Explain the drain characteristics of JFET with external bias? It gives relation between Id and Vds for different values of Vgs.(which is called the running variable). The ab
what is quantization noise
SUI Subtract Immediate I Instructions The 8 bit data specified in the instruction is directly subtracted from the contents of accumulator and results of operation
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