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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

 (E2 - V2) / E2
 (V2 - E2) / V2
 (V2 - E2) / E2
 (E2 - V2) / V2

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Electrical Machines
Ideal value of voltage regulation of a device is?

 0
 a positive finite value
 ∞
 a finite negative value

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Electrical Machines
For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with

 either of these
 constant V, Tst increases
 constant supply voltage V, starting torque Tst decreases
None of these

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Electrical Machines
stepped cores are used in transformers in order to reduce

 volume of iron.
 volume of copper.
 iron loss.
 reluctance of core.

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Electrical Machines
Which of the following represents the rotating losses of machine?

 Friction and windage losses
 Eddy current losses
 Hysteresis losses
 All of the them

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Electrical Machines
Tappings of a transformer are provided

 at the neutral side end of hv side
 at the phase end of hv side
 at the phase end of lv side
 at the middle of hv side

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