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Electrical Machines

Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 250 rpm
 2000 rpm
 1000 rpm
 500 rpm

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Electrical Machines
A 220 V DC machine has an armature resistance 1 Ω. If the full load current is 20 A, the difference of induced voltage between generator and motor is

 40 V.
 20 V.
 60 V.
 0 V.

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Electrical Machines
Which type of motors uses slip rings?

 Synchronous motors
 Induction motors
 Both Synchronous and Induction motor
 DC Shunt Motor

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Electrical Machines
The brushes of a DC machine should be placed on the

 commutator in the polar axis.
 armature in the polar axis.
 commutator in the inter polar axis.
 armature midway between poles.

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Electrical Machines
DC machine windings are

None of these
 short pitched
 either of these
 full pitched

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Electrical Machines
To avoid formation of grooves in the commutator

 the brushes of same polarity should track each other.
  the brushes of opposite polarity should track each other.
None of these
  brush position has no effect on the commutator grooving.

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