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Electrical Machines

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

 DC.
 both of above.
None of these
 AC.

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Electrical Machines
If Pi and Pc represent core and full load copper loss respectively, the maximum KVA delivered to load corresponding to maximum efficiency is equal to rated KVA is

 √(Pi/Pc)
 Pc/Pi
 (Pi/Pc)2
 Pi/Pc

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Electrical Machines
Which of the following motor has more stability

None of these
 both motors has same stability
 cylindrical motor
 salient pole motor

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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 50 KVA
 123.3 KVA
 83.33 KVA
 100 KVA

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

 20 V.
 0 V.
 60 V.
  40 V.

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Electrical Machines
In dc machines, the space waveform of the air-gap flux distribution affects

 both the torque and voltage
 torque but not the voltage
 neither the voltage nor the torque
 voltage but not the torque

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