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Alternators

Alternators
The speed of an alternator is changed from 3000 rpm to 1500 rpm. The generated emf/phase will become

One fourth
Half
Double
Unchanged

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Alternators
The ac armature winding of an alternator is _______

Always star connected
Star-delta connected
Generally delta connected
None of the listed here

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Alternators
Alternators are usually design to generate

Variable frequncies
Definite currents
Definite frequencies
Definite power factor

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Alternators
The dark and bright lamp method is used for

Synchronizing
Phase sequence
Balancing of load
Transfer of load

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Alternators
The slip rings emplyod in a 3-phase alternator in hydro station are insulated for

Extra high tension voltage
Full armature voltage
Low voltage
Very low voltage

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Alternators
A two pole alternator is running at 1500 rpm. Its angular velocity is ______

118 rad/s
192 rad/s
157 rad/s
212 rad/s

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