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Electrical Machines

Electrical Machines
A DC generator without commutator is a

 DC generator
 DC motor
 induction motor
 AC generator

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Electrical Machines
The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg )

 1500 Volt.
 1600 Volt.
 2000 Volt.
  0 Volt.

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Electrical Machines
Regenerative braking is not found in which motor?

 DC shunt.
  DC series.
 DC compound.
 Induction motor.

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Electrical Machines
Which type of motors uses slip rings?

 DC Shunt Motor
 Synchronous motors
 Both Synchronous and Induction motor
 Induction motors

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Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 supply voltage V
 V²
 1/V
 1/V²

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Electrical Machines
A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp?

  15 N.
 20 N.
  Can't be determined.
  None of these.

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