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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
Responses to Exponential Excitations Let us consider Aest as a typical exponential excitation in which A is a constant and s is a complex- frequency variablewith a dimension of
Q. A silicon BJT has an emitter current of 5m Aat 300 K when the BEJ is forward-biased by vBE = 0.7 V. Find the reverse saturation current of the BEJ. Neglecting ICBO, calculate iC
Q. A commercial FMstation broadcasts a signal with 180-kHz bandwidth when |f(t)|max = 2 V. Find kFM for the modulator if the spectral extent of f (t) is 30 kHz, by using Carson's r
what would the change after adding a registor paralelly in clampers?
Q. Explain Standard set of procedure used in Completing a call? Completing a local telephone call between two subscribers linked to the same telephone switch is accomplished th
For the amplifier circuit shown below estimate the mid band voltage gain if the EARLY voltage (V A ) of the current mirror transistors is 80 volts. Assume the d.c biasing is optim
Applications of holography 1. Holography is used in the non-destructive tests by interferometic methods. In this method called double exposure holographic interferometry,
Q. Give a brief description of differentiating circuits ? Differentiation is a measure of the rate of change. A differentiating circuit produces an output voltag
#The requirement is as follows- There is a signal which is in the range of 0 to 5Hz. This signal frequency composition is to determined. The resolution of the determination is 1Hz.
The subsequent voltage-source multiplying DAC is to be utilized to convert the digital data stream "11" and "01" to an analog signal. It has 2-bit inputs and hence is capable of c
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