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Electrical Machines

Electrical Machines
A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively?

 0 KVA
 6 KVA
 10 KVA
 4 KVA

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Electrical Machines
A simple method of increasing the voltage of a DC generator is to

 increase the number of turns in field coil.
  increase the speed of shaft rotation.
 increase the number of turns in armature coil.
 increase the source frequency.

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Electrical Machines
The change in speed of a DC generator due to increased load is corrected by

 increasing armature cooling.
  increasing input power of the prime mover.
  increasing terminal voltage.
  increasing armature resistance.

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor will

 Decrease.d
 none of these.
 increase.
 remains same.

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Electrical Machines
In case of DC Shunt Motor electromagnetic torque developed is

 None of above.
 Proportional to the square of armature current.
 Inversely proportional to the armature current.
 Proportional to the armature current.

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Electrical Machines
In a synchronous generator, if mechanical input is increased with constant excitation, the load angle will

None of these
 decrease
 either increase or decrease
 increase

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