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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 30 rpm
 1500 rpm
 1470 rpm
 zero

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Electrical Machines
In a DC generator if field winding attains the critical resistance

 the voltage generated will be zero.
 machine will generate maximum power.
 machine will generate maximum voltage.
 field winding will burn.

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Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmin to Imin.
 Vmin to Imax.
 Vmax to Imax.
 Vmax to Imin.

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Electrical Machines
Commonly used starters of cage motor is

  star delta.
  DOL.
None of these
  both A and B.

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Electrical Machines
Which of these types of motor is self starting?

  Poly-phase synchronous machine.
  Poly-phase induction motor.
  Single phase induction motor.
  None of these.

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Electrical Machines
In double cage induction motor, the outer cage offers

  high resistance and low reactance.
  low resistance and low reactance.
  high resistance and high reactance.
  low resistance and high reactance.

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