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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?

 1470 rpm
 30 rpm
 zero
 1500 rpm

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Electrical Machines
For a DC machine having P no of pole pairs Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for lap-winding ?

 PZL/4S
 PZL/ 4Sa
 PZL/4Sa²
 PZL/4SP²

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Electrical Machines
High starting torque and low starting current is the advantage of

  stepper motor.
  squirrel cage induction motor.
  hysteresis motor.
  slip ring induction motor.

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Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

 None of above.
 Decreases.
 Increases.
 Remain unchanged

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Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 16/9.
 9/16.
 4/3.
 3/4.

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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

 more than 6 V
 zero
 6 V
 less than 6 V

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