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Electrical Machines

Electrical Machines
A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively?

 6 KVA
 0 KVA
 10 KVA
 4 KVA

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Electrical Machines
What is the mechanical power developed by a DC series motor is maximum?

 None of above.
 Back emf is equal to half the applied voltage.
 Back emf is equal to zero.
 Back emf is equal to applied voltage.

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Electrical Machines
3rd harmonics are eliminated in induction motor by using

  delta connection.
  V connection.
  zig - zag connection.
  star connection.

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Electrical Machines
The use of higher flux density in the transformer design

None of these
 increases the weigh per KVA
 reduces the weigh per KVA
 has no relation with the weight of transformer

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 94%
 96%
 95%
 92%

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

 Low load.
  Full load.
 None of these.
 No load.

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