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Electrical Machines

Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmax to Imin.
 Vmax to Imax.
 Vmin to Imin.
 Vmin to Imax.

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Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

 both of above.
 DC.
None of these
 AC.

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Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up

 220 V
 6 V
 somewhat less than 220 V
 more than 220 V

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Electrical Machines
Field winding of a DC series motor is usually provided with thick wire

 to reduce the insulation of materials.
 in order to reduce eddy current to provide large flux.
 to provide large flux.
 as it carries large load current.

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

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

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Electrical Machines
Dynamic braking can be used for

 compound motors.
 shunt motors.
All of these
 series motors.

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