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Electrical Machines

Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

 4.
  2.
 6.
  8.

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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/4S
 PZL/ 4Sa
 PZL/4Sa²
 PZL/4Sp²

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Electrical Machines
Reactive power generated or delivered significantly depends on

 both 1 and 2.
 frequency.
 excitation.
 load angle.

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Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

 0.25.
 1.24.
 0.62.
 0.72.

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Electrical Machines
Width of a carbon brush should be equal to

 the width of the 2 to 3 commutator segment.
 the width more than 3 commutator segment.
 less than the width of commutator segment.
 the width of the 1 to 2 commutator segment.

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Electrical Machines
The power factor of squirrel cage induction motor is

 low at heavy loads only
 both A and B
 low at rated load only
 low at light loads only

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