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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
Q. Describe about digital communication systems fl A digital signal can be deflned as having any one of a finite number of discrete amplitudes at any given time. The signal coul
Half-wave rectifier: A half-wave rectifier will just only give one peak per cycle and for this reason and other reasons is only employed in extremely small power supplies. A f
A three-phase induction motor, operating at its rated voltage and frequency, develops a starting torque of 1.6 times the full-load torque and a maximum torque of 2 times the full-l
Q. The quantum levels of a quantizer are separated by the step size δv = 0.2 V, with the lowest and highest levels of-3.3 V and +3.3 V, respectively. A sequence ofmessage sample
how unbalanced effect in wave winding is considered to be balanced?
Q. In a differentiating circuit, R=10 kW,and C=2.2μF.If the input voltage goes from 0V to 10 V at a constant rate in 0.4s, determine the output voltage. Solution: e 0 =
In practice, it is usually better to wind the field coils on the rotor and supply the field current to them via slip rings. As the rotor turns, the changing magnetic field expe
Geographic Information System: Geographic Information System (GIS) is a computer system capable of assembling, manipulating, storing, and displaying geographically referenced
FIFO (First in First Out) stack is used in 8086.In this type of Stack the first stored information is retrieved first.
Q. Why FET is called a voltage-controlled device? Why its input resistance is high? In the case of a FET the output current ID is a function of the voltage VGS applied to the i
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