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Electrical Machines

Electrical Machines
The output power of any electrical motor is taken from the

 Coupling mounted on the shaft.
 Field.
 Armature.
 Motor frame.

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 any of the above
 remains unaffected
 increases
 decreases

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Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 4 ang 1
 2 and 2
 4 and 2
 2 and 1

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Electrical Machines
Centrifugal switch is absent in which of the single phase induction motor?

 Split phase motor.
None of these
 Shaded pole motor.
  PSC (permanent split capacitor) motor.

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Electrical Machines
In a transformer, hysteresis and eddy current losses depend upon

 supply frequency
 load current
 maximum flux density
 both 2 and 3

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ V
 T ∝ 1/V
 T ∝ 1/V²
 T∝ V²

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