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Electrical Machines

Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 900 rpm
 850 rpm
 950 rpm
 1000 rpm

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Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

 100W
 1000W
 3000W
 500W

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Electrical Machines
Which of the following alternators contain large number of poles?

 Turbo alternators.
None of these
 Hydro alternators.
 Aame in both alternators.

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Electrical Machines
The direction of rotation of conductor of a DC motor can be determined by

 Lenz's law.
 Ampere law.
 Fleming's left hand rule.
 Fleming's right hand rule.

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Electrical Machines
What are the starters used for starting of cage motors?

 DOL starter.
 Auto transformer starter.
 Star-delta starter.
  All of these.

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

 6 KVA
 10 KVA
 4 KVA
 0 KVA

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