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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 50 Hz
 0 Hz
 1 Hz
 5 Hz

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Electrical Machines
In electric locomotives which of the following motor are used ?

 Synchronous motor.
 DC series motor.
 DC compound motor.
 DC Shunt motor.

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

 AC synchronous motor.
 cummulative compound motor.
 shunt motor.
  series motor.

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Electrical Machines
An induction motor is, in general analogous to

 auto transformer.
None of these
 two winding transformer with secondary short circuited.
 two winding transformer with secondary open circuited.

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Electrical Machines
The ___________________ generator has the poorest voltage regulation.

  differential compounded.
  shunt.
  over compounded.
  under-compounded.

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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 83.33 KVA
 50 KVA
 100 KVA
 123.3 KVA

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