Armature Reaction in Alternators

Armature Reaction in Alternators

Q1. If the load connected to the alternator are having zero leading power factor and zero lagging power factor, then the nature of load in each case will be

a. Inductive, capacitive
b. Inductive, inductive
c. Capacitive, capacitive
d. Capacitive, inductive

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Q2. The synchronous reactance of an alternator is equal to

a. Leakage reactance of armature
b. Armature reaction reactance
c. Sum of leakage reactance and armature reaction reactance
d. Difference of leakage reactance and armature reaction reactance

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Q3. Consider a purely inductive load connected to the alternator having zero lagging power factor. In this case the effect of armature reaction will be

a. Demagnetizing effect
b. Cross magnetizing effect
c. Both (a) or (b)
d. None of above

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Q4. When a purely capacitive load is connected to the alternator having zero leading power factor then the armature flux and main flux will be

a. In the same direction
b. In the opposite direction
c. Main flux will lead armature flux by 90 degree
d. Main flux will lag armature flux by 90 degree

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