Alternators are constructed with:a)Rotating armature and rotating fieldb)Stationary armature and rotating fieldc)Rotating armature and stationary fieldd)Stationary armature and stationary fieldCorrect answer is option 'B'. Can you explain this answer?

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Alternators are constructed with:

a)
Rotating armature and rotating field
b)
Stationary armature and rotating field
c)
Rotating armature and stationary field
d)
Stationary armature and stationary field

Correct answer is option 'B'. Can you explain this answer?

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Alternators are constructed with:a)Rotating armature and rotating fiel...

The field winding of an alternator is placed on the rotor and is connected to DC supply through two slip rings.

The 3-phase armature winding is placed on the stator. This arrangement has the following advantages:

It is easier to insulate stationary winding for high voltages for which the alternators are usually designed
The stationary 3-phase armature can be directly connected to load without going through large, unreliable slip rings and brushes
Only two slip rings are required for DC supply to the field winding on the rotor. Since the exciting current is small, the slip rings and brush gear required are of light construction
Due to the simple and robust construction of the rotor, higher speed of rotating DC field is possible. This increases the output obtainable for a machine of given size

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A shunt motor rotating at 1500 r/min is fed by a 120 V source. The line current is 51 A and the shunt field resistance is 120 ohms. If the armature resistance is 0.1 ohm, calculate the current in the armature.

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Alternators are constructed with:a)Rotating armature and rotating fieldb)Stationary armature and rotating fieldc)Rotating armature and stationary fieldd)Stationary armature and stationary fieldCorrect answer is option 'B'. Can you explain this answer?

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