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Electrical Machines

Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 2HZ
 50Hz
 1 Hz
 2.5Hz

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Electrical Machines
On which of the following factor/factors the speed of a DC motor depends upon?

 Armature current.
 All of these.
 Field flux.
 Applied voltage.

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Electrical Machines
No load test of 3-phase induction motor gives which of the following?

 both A and B
 variable loss
None of these
 constant loss

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/√3, 1/3
 1/3, 1/√3
 1/√3, 1/√3
 1/3, 1/3

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Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

 4 times.
 double.
 half.
 one fourth.

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Electrical Machines
For pure resistive load what is the armature reaction?

 cross magnetization
 demagnetization
 magnetization
All of these

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