Standard Book, Technical General
AC Electrics - Alternators: DGCA Technical General questions
Larger aircraft generate AC because transformers can change its voltage, and sending power at a higher voltage needs lighter cables. Most aircraft alternators have a rotating field and a stationary armature, and a constant frequency system holds 400 Hz through a constant speed drive unit, the CSDU.
The 65 questions cover three phase connections, frequency wild supplies, the CSDU and load sharing between paralleled alternators. The exam record shows 1 of them.
In a star wound system line voltage is phase voltage times the square root of 3, so 115 volt phases give 200 volts. Real load, in kW, is shared by adjusting drive torque; reactive load, in kVAR, by adjusting excitation. A disconnected CSDU is reset only on the ground.
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Question 1 of 5
An alternator is:
Question 2 of 5
To prevent high circulating currents between paralleled alternators, the following conditions should be met:
Question 3 of 5
The output of an AC generator is taken from:
Question 4 of 5
The moving part of an alternator is:
Question 5 of 5
A frequency wild alternator must be:
60 more questions in this chapter
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