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Electrical Machines

Electrical Machines
Commonly used starters of cage motor is

None of these
  DOL.
  star delta.
  both A and B.

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Electrical Machines
Demagnetization effects which of the following?

 commutation
 reduces the terminal voltage
 reduction in main field flux
 both B and C

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Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would

 not change.
 increase.
 decrease.
 None of above.

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Electrical Machines
Diverters are used only in

None of these
 shunt motors
 either of these
 series motors

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

 T ∝ P.
 T2 ∝ P3.
 T ∝ √P.
 T is independent of P.

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Electrical Machines
Maximum power developed depends on

 both 1and 2
 voltage
 reactance
 load angle

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