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1. The emf generated in a coil of an alternator is 20 V. Calculate the emf between the ends of two such coils connected in series if they are separated on the alternator core by 30 electrical degrees. [38.64 V

1. The emf generated in a coil of an alternator is 20 V. Calculate the emf between the ends of two such coils connected in series if they are separated on the alternator core by 30 electrical degrees. [38.64 V

Delmar's Standard Textbook Of Electricity
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter31: Three-phase Alternators
Section: Chapter Questions
Problem 1RQ: What conditions must be met before two alternators can be paralleled together?
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1. The emf generated in a coil of an alternator is 20 V. Calculate the emf between the ends of two such coils connected in series if they are separated on the alternator core by 30 electrical degrees. [38.64 V] 2. A 3 - phase, star – connected, 2 - pole alternator runs at 3600 rpm. 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 the first principles. [60 Hz; 11.5 kV] 3. A 3 - phase, 4 - pole, star - connected alternator has 24 slots with 12 conductors per slot and the flux per pole is 0.1 Wb. Calculate the line emf generated when the alternator is driven at 1500 rpm. All phase conductors are connected in series. Assume sinusoidal emf. [1785 V] The field system of a 50 - Hz alternator has a sinusoidal flux per pole of 0.1 Wb. Calculate the emf generated in one turn which spans two-thirds of a pole - pitch. 4. [19.2 V] 5. A 3-phase, 50 – Hz, star - connected, 2000 - KVA, 2300 - V alternator gives a short circuit current of 600 A for a certain field excitation. With the same excitation, the OC voltage was 900 V. The resistance between a pair of terminals was 0.12 . Find the full load regulation at (a) UPF (b) 0.8 pf lagging and (c) 0.8 pf leading [7.3%; 23.8 %; -13.2%]
Transcribed Image Text:1. The emf generated in a coil of an alternator is 20 V. Calculate the emf between the ends of two such coils connected in series if they are separated on the alternator core by 30 electrical degrees. [38.64 V] 2. A 3 - phase, star – connected, 2 - pole alternator runs at 3600 rpm. 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 the first principles. [60 Hz; 11.5 kV] 3. A 3 - phase, 4 - pole, star - connected alternator has 24 slots with 12 conductors per slot and the flux per pole is 0.1 Wb. Calculate the line emf generated when the alternator is driven at 1500 rpm. All phase conductors are connected in series. Assume sinusoidal emf. [1785 V] The field system of a 50 - Hz alternator has a sinusoidal flux per pole of 0.1 Wb. Calculate the emf generated in one turn which spans two-thirds of a pole - pitch. 4. [19.2 V] 5. A 3-phase, 50 – Hz, star - connected, 2000 - KVA, 2300 - V alternator gives a short circuit current of 600 A for a certain field excitation. With the same excitation, the OC voltage was 900 V. The resistance between a pair of terminals was 0.12 . Find the full load regulation at (a) UPF (b) 0.8 pf lagging and (c) 0.8 pf leading [7.3%; 23.8 %; -13.2%]
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