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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 ABOUT THE STABILITY IF WE USE COMPENSATOR
What are the precautions to be taken before basic work on electrical installations? Ans: Before starting any electrical works on installations disconnect the power supply to
The mechanical power produced at the armature of a motor is: P = T a . (power is in watts if torque is N.m and in rad/sec). Some of this will be lost due to friction and
1. A 230/1000V 50 Hz, single phase transformer has the following test data: Open circuit test (L.V.) Primary voltage = 230V Primary current = 1.30 A Input power
Explain Resistivity. Resistivity : Resistance R of a wire containing cross-sectional area A and length L maintain the relationship, - R α L and R α 1/A; that is resulting R α
Charge density In a semiconductor
A color television receiver is shown in Figure in block diagram form, indicating only the basic functions. The early part forms a straightforward superheterodyne receiver, except f
Q. Which are the different FET amplifiers? A FET can be used as a small-signal amplifier by connecting one of its lead to signal ground. The other two leads then serve as the i
Equipment parameter data: The schematic diagrams for existing substations have to be prepared along with information of power transformer rating and numbers, impedance values,
Explain effect of frequency of applied electric field. If an external electric field is applied, the distance among charges that is related to chemical bonding keeps constant i
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