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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 5 Hz
 50 Hz
 1 Hz
 0 Hz

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Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

 200 V.
 150 V.
 300 V.
  223.V.

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Electrical Machines
If starter is not used with large DC motor for starting, it will

 all of above.
 provide execessive voltage drop in line.
 damage the armature and commutator.
 draw a starting current many times its rated full load current.

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Electrical Machines
If the field connection of a DC Shunt Motor is changed then

 it will run in opposite direction.
 motor will not run.
 it will run in same direction by slowly.
 it will run in same direction.

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Electrical Machines
Armature of DC machine is made of

 silicon steel.
 non-ferrous material.
 insulating material.
 conducting material.

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Electrical Machines
Which type of motors are preferred in lifts?

 DC compound motors.
 DC shunt motors.
None of these
 DC series motors.

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