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Electrical Machines

Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 0
 1
 2
 3 or 4

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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?

 850 rpm
 900 rpm
 950 rpm
 1000 rpm

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Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

 less than 6 V
 more than 6 V
 6 V
 zero

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Electrical Machines
Which of the following is/are effects of armature reaction?

 increase the iron loss
 increase the maintenance and repair
 increases the design cost
All of these

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Electrical Machines
In alternator, the rotary part is

  magnetic field poles.
 armature.
 none of these.
 core.

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Electrical Machines
The output power indicated on the name plate of any motor is always the

 Gross power.
 Power drawn in KVA.
 Power drawn in KW.
 Output power at the shaft.

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