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Electrical Machines

Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

 Blv2.
 Blv.
 Bl2v.
 Bl2v2.

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

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

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Electrical Machines
Transformer action requires a

 alternating magnetic lux.
 constant magnetic flux.
 alternating electric flux.
 increasing magnetic flux.

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Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

 T∝ P³
 T∝ P
 T∝ P²
 T is independent of P

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Electrical Machines
A dc shunt generator has full-load voltage regulation of 10% at rated speed of 1000 rpm. If it is now driven at 1250 rpm, then its voltage regulation at full load would

 be less than 10%
 remain unchanged
 be 12.5%
 be more than 10%

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Electrical Machines
Voltage across the open circuited field termninals of a synchorous machine under slip test is

 DC.
 AC of supply frequency.
  DC of slip frequency.
 A modulated supply frequency AC voltage with slip frequency envelop.

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