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categoryالهندسة الكهربائية
schoolبكالوريوس
event_available2026-07-15
السؤال
Transcribed Image Text:
Find the no-load phase and line voltage of a star-connected, 4-pole alternator having flux per pole of 0.1
Wb sinusoidally distributed: 4 slots per pole per phase, 4 conductors per slot, double-layer winding
with a coil span of 150°.
[Assuming 1-50 Hz; 789 V; 1366 V] (Elect Technology 1. Bombay Unix 1978)
A 3-, 10-pole. Y-connected alternator runs at 600 r.p.m. It has 120 stator slots with 8 conductors per
slot and the conductors of each phase are connected in series. Determine the phase and line e.m.fs if the
flux per pole is 56 mWb. Assume full-pitch coils.
[1910 V: 3300 V] (Electrical Technology-H. Madras Univ. April 1977)
Calculate the speed and open-circuit line and phase voltages of a 4-pole, 3-phase, 50-Hz, star-connected
alternator with 36 slots and 30 conductors per slot. The flux per pole is 0.0496 Wb and is sinusoidally
[1500 rp.m.; 3,300 V; 1,905 V] (Elect Engg-II. Bombay Univ 1979)
A 4-pole, 3-phase, star-connected alternator armature has 12 slots with 24 conductors per slot and the
flux per pole is 0.1 Wb sinusoidally distributed.
distributed.
Calculate the line e.m.f. generated at 50 Hz.
[1850 V]
A 3-phase. 16-pole alternator has a star-connected winding with 144 slots and 10 conductors per slot.
The flux per pole is 30 mWb sinusoidally distributed. Find the frequency, the phase and line voltage if
the speed is 375 rpm. 150 Hz, 1530 V; 2650 VI (Electrical Machines-1, Indore Uain April 1977)
A synchronous generator has 9 slots per pole. If each coil spans 8 slot pitches, what is the value of the
10.985] (Elect. Machines, A.M.1.E. Sec. B. 1959)
pitch factor?
A 3-phase, V-connected, 2-pole alternator runs at 3,600 r.p.m. If there are 500 conductors per phase in
series on the armature winding and the sinusoidal flux per pole is 0.1 Wb, calculate the magnitude and
frequency of the generated voltage from first principles.
[60 Hz: 11.5 kV]
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