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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
Q. A gyrator is sometimes used in integrated circuits to simulate inductances. Consider the circuit of Figure consisting of a gyrator. (a) Show that the impedance as seen to the
A three-phase transposed line is composed of one ACSR conductor per phase with flat horizontal spacing of 11 meters as shown in Figure (a). The conductors have a diameter of 3.625
varification of ohm''s law
Q. What do you mean by Load factor? The two components of electric service are demand and energy. Demand is the maximum level of real power which the electric utility must supp
Athree-phase, 440-V, 60-Hz, four-pole induction motor operates at a slip of 0.025 at full load, with its rotor circuit short-circuited. This motor is to be operated on a 50-Hz supp
RST Restart Instructions Restart instructions are one byte call instructions. Called location for each restart instruction is predefined on page 0 ( read only memory). They
Q. A dc series motor operates at 750 r/min with a line current of 100 A from the 250-V mains. Its armature-circuit resistance is 0.15 and its series-field resistance is 0.1 . As
Modern complex systems are normally constructed by interconnecting sub-units. Therefore the systems engineer is often not too concerned about the details of what is inside these
problems on combination clipper
Q. Show Principal source of energy? The principal source of energy comes from the burning of fossil fuels such as coal and oil to generate steam, which drives steam turbines, w
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