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Electrical Machines

Electrical Machines
Swinburne test is conducted under which of the following condition?

 any of the above
 half load
 full load
 no load

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Electrical Machines
In which transformer, the tertiary winding is used?

 Star - star
 Delta - star
 Delta - delta
 Star - delta

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Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 33.3%
 57.7%
 50%
 66.3%

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Electrical Machines
Torque developed in the rotor is

 inversely proportional to slip
 directly proportional to slip
 either of these
 not dependent on the slip

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Electrical Machines
Slip test is performed to determine

All of these
 direct axis reactance and quadrature axis reactance
 slip
 positive sequence reactance and negative sequence reactance

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Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

  223.V.
 200 V.
 300 V.
 150 V.

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