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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
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
Q. Why do we cascade amplifiers? Why is RC coupling the most widely used coupling between 2 stages of a cascading amplifier? The voltage or power gain or frequency response obt
Name the special functions registers available in 8051. Accumulator B Register Program Status Word. Stack Pointer. Data Pointer. Port 0 Port 1 Port 2 Po
What is current electricity
Q. Draw a block diagramfor a 2-to-4 decoder. Obtain the truth table, and develop a logic diagram.
Q. (a) Consider a three-phase star or wye half-wave recti?er with a purely resistive load R. Determine: (i) efficiency, (ii) formfactor, (iii) ripple factor, (iv) TUF, and (v) PIV
The mathematical relationships of control systems are usually represented by block diagrams, which show the role of various components of the system and the interaction of variable
Drift Current Density and Conductivity: Consider a conductor of length / meters and cross sectional area a square meters, as shown in Fig. Let the number of free electrons ava
Explain the basic working principle of ultrasonic machining with the help of diagram. What are the different kinds of tool materials explain, tool holders are used in ultrasonic
current and voltage
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