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Electrical Machines

Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  1.0.
  0.1.
  0.05.
  0.5.

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Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 375 rpm
 75 rpm
 3000 rpm
 1500 rpm

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Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

 100Hz.
 200Hz.
 50Hz.
 150Hz.

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Electrical Machines
A dc motor with armature resistance of 0.5 ohms connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 250 A.
  340 A.
  460 A.
 570 A.

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Electrical Machines
A single phase transformer has specifications as 250 KVA, 11000 V/415 V, 50 Hz. What are the values of primary and secondary currents?

 primary = 602 A, secondary = 22.7 A
 primary = 11.4 A, secondary = 301 A
 primary = 22.7 A, secondary = 602.4 A
 primary = 301 A, secondary = 22.7 A

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Electrical Machines
The voltage regulation of a DC generator at full load being zero implies that the generator is

  cumulatively compounded.
  deferentially compounded.
  series connected.
 shunt connected.

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