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Electrical Machines

Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 +3.33%
 +3%
 -3.33%
 -3%

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Electrical Machines
Which of the following motor has negative speed regulation?

 Shunt motor
 Series motor
 Differential compound motor
 Cumulative compound motors

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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the starting current will be enormously high.
 the starting torque becomes low.
 the motor may not start.
 the motor may run away.

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Electrical Machines
Scott connections are used for

 three phase to two phase transformation.
 single phase to three phase transformation.
 three phase to single phase transformation.
 any of the above.

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Electrical Machines
A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is

 2, 3 ,5
 2, 3, 4, 5
 2, 3, 4
 1, 2, 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.
 10 volts.
 40 volts.
 20 volts.

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