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Electrical Machines

Electrical Machines
Diverters are used only in

 shunt motors
 series motors
 either of these
None of these

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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

 150 V.
 200 V.
  223.V.
 300 V.

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Electrical Machines
The breakdown torque of a synchronous motor varies as

 applied voltage V
 1/V²
 V²
 1/V

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Electrical Machines
The functions of inter poles are

 nullify reactance voltage and improve the commutation.
 reduce cross magnetization effect and improve commutation
None of these
 both 1 and 2

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Electrical Machines
Induction motors normally use cast aluminium rotor because aluminium is

  of low resistivity.
  lighter in weight.
  cheaper in cost.
  easy to cast owing to its low melting point and is easily available.

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Electrical Machines
The change in speed of a DC generator due to increased load is corrected by

  increasing input power of the prime mover.
  increasing armature resistance.
  increasing terminal voltage.
 increasing armature cooling.

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