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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. Explain Emergency Repairs to rail fracture? Emergency Repairs - The fractured rails shall be joined by using the arrangements clamps, fish plates. If the gap at fracture doe
Q. Determine the time delay of the cable? An RG-213/U (radio guide 213/universal coaxial cable) is a small-sized, flexible, double-braided cable with silvered-copper conductors
In second technique, a concentrator expander (CE) is used near cluster of users and another one at exchange end as demonstrated in figure. Only a few junction lines are run between
Q. The electric field intensity due to a point charge in free space is given to be Determine the location and the value of the point charge.
A 3-phase, wye-connected, 11 kV, 137.5 MVA turbo-alternator of 0.8 power factor lagging has a synchronous reactance XS = 1.4 Ω. Assume the machine to be ideal for convenience of an
A signal stands for 0110 with positive logic in which low stands for 0 and high stands for 1. If negative logic (in which low stands for 1 and high stands for 0) is used, what digi
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Using Bode plot calculate (a) Phase margin (b) Gain margin (c) Stability of closed loop system. The open transfer function of the system is t=30/(s+2)/(s+3)Using Bode plot calcula
Design combinational-sequential electronic logic gate circuit for a car wash....
Q. Justify disadvantages and advantages of packet switching over circuit switching? Ans: Comparison of circuit switching and packet switching showing disadvantages and advan
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