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Electrical Machines

Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 460 V.
 115 V.
 200 V.
 230 V.

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Electrical Machines
If the air gap of IM is increased, ____________ will increase.

  power factor.
  magnetizing current.
  air gap flux.
  speed.

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Electrical Machines
Flux density under trailing pole tips in case of generator will

None of these
 decrease
 either increase or decrease
 increase

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Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will

 develop very low starting torque.
 not start automatically.
 get damaged.
 start automatically without trouble.

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

 Capacitor run
 Resistance split phase
 Capacitor start
 Shaded pole

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Electrical Machines
Armature resistance control method is used for the _______ ?

 below rated speed
None of these
 both 1 and 2
 above rated speed

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