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A synchronous motor has the following parameters per phase. E=2kv, Eo=5kv, X2=3ohms, and I=700amps. Draw the phasor diagram and determine
(a) power angle delta,
(b) active power(3phase),
(c) reactive power(3phase),
(d) power factor of the motor. If the load is removed suddenly, calculate
(e) the new power angle and
(f) new reactive power(3phase).
Ratiometer type frequency meter
The frequency of an oscillator may be measured by an oscilloscope with a callbrated time base(True/False)
Q. A magnetic circuit is found to have an ac hysteresis loss of 10 W when the peak current is Im = 2 A. Assuming the exponent of Bm to be 1.5, estimate Ph for Im = 0.5A and 8A.
precision
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