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Electrical Machines

Electrical Machines
Eb/V ratio of a DC motor is an indication of

  Effiency.
 Starting torque.
 Running Torque.
 Speed regulation.

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Electrical Machines
1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be

 less than 30 W
 zero watt
 30 W
 more than 30 W

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Electrical Machines
In DC series motor the speed is ______________ proportional to the armature current.

 directly.
 inversely.
 none of these.
 has no relation.

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.02
 0.2
 0.04
 0.4

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Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

 PZL/4Sa²
 PZL/4Sp²
 PZL/4S
 PZL/ 4Sa

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Electrical Machines
There are two 2-pole DC machines. Main field axis of machine A is horizontal and that of B is vertical. It is preferable to purchase

 any of the two machines
 machine B
 machine A
 none of these

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