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ELECTRICAL MACHINES

Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

 T is independent of P
 T∝ P
 T∝ P²
 T∝ P³

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Electrical Machines
Slot wedges in a dc machine is made up of

 mild steel.
 silicon steel.
 cast iron.
 fibre.

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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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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

 to avoid over heating.
All of these
 to achieve a stronger magnetic field.
 to avoid locking of the armature.

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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.
 150Hz.
 100Hz.
 50Hz.

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