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Q. A 10-kVA, 200:400-V, single-phase transformer gave these test results:
• Open-circuit test (LVwinding supplied): 200V, 3.2 A, 450 W
• Short-circuit test (HV winding supplied): 38 V, 25 A, 600 W
Compute the efficiency when the transformer delivers half its rated kVA at 0.85 power factor lagging.
Classify the different types of insulating materials with reference to their limiting safe temperatures for use. On the basis of insulating materials and their limiting safe te
Q. A commercial FMstation broadcasts a signal with 180-kHz bandwidth when |f(t)|max = 2 V. Find kFM for the modulator if the spectral extent of f (t) is 30 kHz, by using Carson's r
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