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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  aluminium.
  mild steel.
  cast iron.
  stainless steel.

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Electrical Machines
The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________.

 15 %.
  10 %.
 50 %.
 25 %.

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Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

 6 V
 more than 6 V
 less than 6 V
 zero

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Electrical Machines
When a synchronous motor is running at synchronous speed, the damper winding produces

 damping torqe.
 eddy current torque.
 no torque.
 both 1 and 2.

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Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

 44.47 Amp.
 29 Amp.
  33.33 Amp.
  43 Amp.

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Electrical Machines
Ward Leonard control is provides speed control

  In one direction only.
  Above rated speed.
  Below rated speed.
  In both direction.

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