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Electrical Machines

Electrical Machines
In alternator, the rotary part is

  magnetic field poles.
 core.
 none of these.
 armature.

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Electrical Machines
The brush-axis of a bipolar dc motor is rotated by 90°. The effect of this rotation on the back emf Eband the torque developed Tdwould be such that

 Eb is unchanged, but Td is zero
 both Eb and Td are unchanged
 both Eb and Td are zero
 Eb is zero, but Td is unchanged

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Electrical Machines
Dynamic braking is employed to brake

 both 1 and 2
 non reversing drive
None of these
 reversing drive

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Electrical Machines
In field flux method speed control of DC Motor is

 constant power drive above base speed.
 constant hp drive below the base speed.
 constant torque drive below the base speed.
 constant torque drive above the base speed.

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Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 rectangular
 co- sinusoidal
 sinusoidal
 flat-topped

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Electrical Machines
Series field consists of--------number of turns and ---------- conductors respectively

 less and thin
 large and thick
 large and thin
 less and thick

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