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Electrical Machines

Electrical Machines
Hopkinss test in DC motor is conducted at ?

 Low load.
 No load.
  Full load.
 None of these.

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Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  about 2 V.
  about 50 V.
  zero.
  220 V.

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Electrical Machines
When pure inductive load is connected to the alternator, what is the effect of armature reaction?

 Demagnetization
 Magnetization
 Cross magnetization
None of these

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

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

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Electrical Machines
Which of the following DC Motor is used in paper machines?

 DC Shunt motor.
 Separately excited DC motor.
 DC compound motor.
 DC series motor.

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Electrical Machines
In auto transformer if the turn ratio is K, what is the power transferred inductively?

 (1-K) × input power
 both A and B
 K × input power
None of these

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