Discussion
The synchronous reactance of an alternator is generally____________than armature resistance.
Answer: C
The synchronous reactance is generally 10 to 100 times greater than the armature resistance.
Synchronous reactance combines the leakage reactance of the armature with the effect of armature reaction, and in practical alternators it is large, often of the order of one per unit, while the armature resistance is only about 0.01 per unit. That is why the resistance is often neglected in calculations of regulation and power.
The reactance is far larger than the resistance, so the 'smaller' options are wrong, and five times greater understates the usual ratio.
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