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Electrical Machines

Electrical Machines
which of the following losses are negligible in blocked rotor test?

 copper loss
 mechanical loss
 iron loss
 both A and B

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Electrical Machines
Which of the following is/are effects of armature reaction?

 increase the iron loss
 increases the design cost
All of these
 increase the maintenance and repair

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Electrical Machines
DC machine windings are

None of these
 short pitched
 either of these
 full pitched

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Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 75 rpm
 1500 rpm
 375 rpm
 3000 rpm

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Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

 36.36% decrease
 18.18% increase
 36.36% increase
 36.36% increase

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Electrical Machines
Which of the following voltage regulation method is accurate ?

 MMf method
 Synchronous impedance method
 American standard association method
 ZPF method

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