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Electrical Machines

Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 decreases
 increases.
 remains constant.
 decreases.

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Electrical Machines
In a DC Motor 3 point starter is used to

 all of above.
 limit the starting current to a safer value.
 provide protection against Low-Voltage.
 provide overload protection.

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Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

 PZL/ 4Sa
 PZL/4S
 PZL/4Sp²
 PZL/4Sa²

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Electrical Machines
Belt conveyors offer _______________ starting torque.

  zero.
  medium.
  low.
  high.

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Electrical Machines
Eb/V ratio of a DC motor is an indication of

 Running Torque.
 Speed regulation.
  Effiency.
 Starting torque.

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Electrical Machines
A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is

 cross – magnetizing.
 ineffective.
  demagnetizing.
 magnetizing.

ANSWER DOWNLOAD EXAMIANS APP
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