4. (a). A 250 MVA, 24 kV, 60 Hz, three-phase alternator is operating at rated voltage, rated frequency, and rated apparent power with a terminal power factor of 0.8 lagging. Stator coil resistance is negligible. The excitation voltage E, = 20 kV . Determine (a) the torque angle and (b) the value of synchronous reactance. (10 Marks) APPLY - 1 (b). If the load on a synchronous motor is increased beyond the torque angle & =90°, what would happen to the running synchronous motor? ( 5 marks)
4. (a). A 250 MVA, 24 kV, 60 Hz, three-phase alternator is operating at rated voltage, rated frequency, and rated apparent power with a terminal power factor of 0.8 lagging. Stator coil resistance is negligible. The excitation voltage E, = 20 kV . Determine (a) the torque angle and (b) the value of synchronous reactance. (10 Marks) APPLY - 1 (b). If the load on a synchronous motor is increased beyond the torque angle & =90°, what would happen to the running synchronous motor? ( 5 marks)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Please solve Quickly A and B
Transcribed Image Text:(10 marks)
ANALYZE -1
4. (a). A 250 MVA, 24 kV, 60 Hz, three-phase alternator is operating at rated voltage, rated
frequency, and rated apparent power with a terminal power factor of 0.8 lagging. Stator
coil resistance is negligible. The excitation voltage E, = 20 kV . Determine (a) the torque
angle and (b) the value of synchronous reactance.
(10 Marks)
APPLY - 1
(b). If the load on a synchronous motor is increased beyond the torque angle & =90°, what
would
happen
to
the
running
synchronous
motor?
(5 marks)
ANALYZE -2
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