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Q. Briefly explain about Wye-delta transformation?
Certain network configurations cannot be reduced or simplified by series-parallel combinations alone. In some such cases wye-delta (Y- ) transformation can be used to replace three resistors in wye configuration by three resistors in delta configuration, or vice versa, so that the networks are equivalent in so far as the terminals (A, B, C) are concerned, as shown in Figure. For equivalence, it can be shown that
For the simple case when RA = RB = RC = RY, and RAB = RBC = RCA = R , Equations (1) and 2) become
#What are the types of Negative Feedback Amplifier?
Q. Explain the working principle of an opto coupler? When it is necessary to block the voltage between one electronic circuit and another, and transfer the signal at the same t
Electrical energy If the power is measured in watts and the time in seconds then the unit of energy is watt- seconds or Joules.
What is ammeter An ammeter is an instrument used to calculate current and must be connected in series with the circuit.
Q. If an antenna has an available noise power of 1.6 × 10 -15 W in a 1-MHz bandwidth, find the antenna temperature.
Derive the mathematical 3-D heat conduction equation in Spherical Coordinates? A furnace is made up of three layers of thicknesses 250 mm, 150 mm nad 100 mm with thermal conduct
A 3 phase 400 volt(line to line) wye connected synchronous motor has Xs= 1 ohm per phase and a negligible armature resistance. The field current is so adjusted that the internal(in
Q. Explain the Importance of distributing frames? Basically four levels of cabling are used as displayed in Figure. At the subscriber end, drop wires are taken to a distributio
Define permanent magnet A permanent magnet is a piece of ferromagnetic material (like as iron, nickel or cobalt) which has properties of attracting several pieces of these mater
Provide Definition of Signals A continuous-time signal x(t) is a signal that is a function of real number t. For a discrete-time signal x[n], it is a method of discrete time in
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