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Q. On a per-phase basis, let v = √2 V cos ωt and i = √2 I cos (ωt - θ).
(a) Express the instantaneous power s(t) in terms of real power P and reactive power Q.
(b) Now consider the energy E associated with the instantaneous power and show that E = Pt, where t is the duration of the time interval in seconds.
3. Design and draw a circuit using the cascade system to operate two cylinders (A and B) which, on the operation of a start valve, produces the sequence A – B + B – A+. The cylinde
Q. Two balanced, three-phase, wye-connected loads are in parallel across a balanced three-phase supply. Load 1 draws a current of 20 A at 0.8 power factor leading, and load 2 draws
how do I find the ic and ve
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Q. Required Conditions for connecting two transformers in parallel? Ans: a) Voltage rating should be same b) Per unit impedance should be same c) Phase sequence should
Q. Illustrate Power Semiconductor Devices? Since the advent of the first thyristor or silicon-controlled rectifier (SCR) in 1957, tremendous advances have been made in power se
For the motor speci?ed in figure, compute the following: (a) The load component I' 2 of the stator current, the internal torque T, and the internal power P m for a slip of 0.
Q. 10-kVA, 4800:240-V, 60-Hz, single-phase transformer has an equivalent series impedance of 120 + j300 referred to the primary high- voltage side. The exciting current of the tr
Q. The radiation pattern of a half-wave dipole antenna is given by (a) Sketch the radiation pattern in the principal plane of xz containing angle θ. (b) Determine the beam wi
Future scope on MATLAB in India
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