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Electrical Machines

Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 high and high
 low and high
 low and low
 high and low

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Electrical Machines
Series field consists of--------number of turns and ---------- conductors respectively

 large and thick
 less and thick
 less and thin
 large and thin

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

 1000 rpm
 950 rpm
 900 rpm
 850 rpm

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Electrical Machines
The rotor electromotive force of the IM is observed to make 100 complete alterations per minute, calculated slip

 0 .001 %.
  3.33 %.
None of these
 3 %.

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Electrical Machines
What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000.

 30 volts.
 20 volts.
 10 volts.
 40 volts.

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Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

 armature winding
 starters
 field winding
 commutator

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