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Electrical Machines

Electrical Machines
Which single phase motor is used for a refrigerator?

  Capacitor run.
  Split phase.
  Universal.
  Repulsion.

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM has a rotor speed of 987 rpm find rotor frequency?

 0.70 Hz.
  0.65 Hz.
  60 Hz.
 0.75 Hz.

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Electrical Machines
The output power indicated on the name plate of any motor is always the

 Power drawn in KVA.
 Gross power.
 Power drawn in KW.
 Output power at the shaft.

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Electrical Machines
When maximum starting torque is obtained, rotor power is

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Electrical Machines
Swinburne's test is applicable to

 DC shunt and level Compound motor.
 DC series motor.
 DC Shunt motor.
 DC compound motor.

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Electrical Machines
The magnetic circuit of a dc shunt generator with negligible armature resistance and brush contact voltage drop remains unsaturated when it delivers full-load current at rated terminal voltage. The brushes are kept in the interpolar axis and speed is maintained constant. When the load is switched off, the terminal voltage would

 become zero
 increase
 decrease
 remain the same

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