GATE EE 2019 Set 1 — Question 58
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Electrical Machines → Synchronous Machines → Synchronous Reactance & Regulation
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Question
A 220 V (line), three-phase, Y-connected, synchronous motor has a synchronous impedance of . The motor draws the rated current of 10 A at 0.8 pf leading. The rms value of line-to-line internal voltage in volts (round off to two decimal places) is _____.
Correct answer
240 to 250
Solution
Step 1: Phase voltage
For the Y-connected machine,Step 2: Line (phase) current
The motor draws at pf leading, so the current leads the terminal voltage by :Step 3: Internal emf per phase
For a synchronous motor,Step 4: Line-to-line internal voltageAnswer: V
For the Y-connected machine,Step 2: Line (phase) current
The motor draws at pf leading, so the current leads the terminal voltage by :Step 3: Internal emf per phase
For a synchronous motor,Step 4: Line-to-line internal voltageAnswer: V
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