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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

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

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Electrical Machines
On which of the following factor/factors the speed of a DC motor depends upon?

 Armature current.
 All of these.
 Field flux.
 Applied voltage.

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Electrical Machines
The core flux in transformer depends mainly on

 supply voltage, frequency and load
 supply voltage and load
 supply voltage and frequency
 supply voltage

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Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

 200Hz.
 100Hz.
 50Hz.
 150Hz.

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Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

 locking.
 crawling.
 cogging.
 plugging.

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Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

 θelec = 2/P*θmech
 θelec = θmech
 θelec = 4/P*θmech
 θelec = P/2*θmech

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