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Electrical Machines

Electrical Machines
In an induction motor, the no-load slip is generally equal to

 4 %.
 1.5 %.
  zero.
  less than 1 %.

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Electrical Machines
Which of the following motor has the highest power factor at full load?

 Resistance split phase
 Capacitor run
 Shaded pole
 Capacitor start

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Electrical Machines
Cross magnetization effects which of the following?

 both 2 and 3
 reduction in main field flux
 commutation
 reduces the terminal voltage

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Electrical Machines
If the field circuit of a DC shunt motor is opened

 The armature current will reduce.
  The motor will attain dangerously high speed.
 The speed of motor will be reduced.
 DC Shunt Motor

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Electrical Machines
Commutators in DC machines have a role of which converts

 AC to DC.
 high voltage DC to low voltage DC.
 none of these.
 Both AC to DC and DC to AC.

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Electrical Machines
The wattage rating of a ceiling fan motor will be

 10 - 20 W.
 250 - 500 W.
 200 - 250 W.
  50 - 150 W.

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