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Instantaneous voltage across Inductor LV = L(di/dt)Given Inductance = 8HRate of change of current di/dt = 0.5AV = 8 × 0.5 = 4 V
The average value of a sin wave for the complete cycle i.e 2Ï€ is given as Vavg = 2⁄Ï€ Vpeak100 = 2⁄Ï€ VpeakVPeak = 157 VP-P = 2X157 = 314
H = I2R.tWhereI = current = 1 AR = Resistance = 10 ohmst = time = 5 secH = 12 × 10 × 5H = 50 watt-sec or Joule
A delta-connected 3-phase circuit has three resistance of 36 Ohms in each phase. What is the value of per phase resistance (in ohms) of the equivalent star-connected circuit?
Per phase resistance Eg: Ra= (RabXRac)/(Rab+Rbc+Rac)So,(36×36)/(36+36+36)=12
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1. In synchronous motor, minimum armature current corresponds to A. lagging…
ECET 2011
5 Comments
Instantaneous voltage across Inductor L
ReplyDeleteV = L(di/dt)
Given Inductance = 8H
Rate of change of current di/dt = 0.5A
V = 8 × 0.5 = 4 V
The average value of a sin wave for the complete cycle i.e 2Ï€ is given as Vavg = 2⁄Ï€ Vpeak
ReplyDelete100 = 2⁄Ï€ Vpeak
VPeak = 157
VP-P = 2X157 = 314
H = I2R.t
ReplyDeleteWhere
I = current = 1 A
R = Resistance = 10 ohms
t = time = 5 sec
H = 12 × 10 × 5
H = 50 watt-sec or Joule
A delta-connected 3-phase circuit has three resistance of 36 Ohms in each phase. What is the value of per phase resistance (in ohms) of the equivalent star-connected circuit?
ReplyDeletePer phase resistance
DeleteEg: Ra= (RabXRac)/(Rab+Rbc+Rac)
So,
(36×36)/(36+36+36)
=12