Armature Resistance in Alternators

Armature Resistance in Alternators

Q1. Generally the effective resistance of alternator under a.c. condition is taken as

a. Less than 1.25 times the d.c. resistance
b. 1.25 to 1.75 times the d.c. resistance
c. Greater than 1.75 times the d.c. resistance
d. None of these

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Q2. Salient pole alternators are best suitable for the application of

a. Hydro electric power plant
b. Thermal power plant
c. Tidal power plant
d. Nuclear power plant

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Q3. When the voltage across any two terminals of an armature winding of star connected alternator, then the armature resistance per phase is

a. Half of the resistance observed across any two line terminals
b. 3/2 of the resistance observed across any two line terminals
c. 2/3 of the resistance observed across any two line terminals
d. Same as the resistance observed across any two line terminals

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Q4. In the given figure of delta connected alternator, the armature resistance per phase (Ra) is equal to



a. 1/2 of R_RY
b. 2/3 of R_RY
c. 3/2 of R_RY
d. R_RY

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