Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

 300 V.
 150 V.
 200 V.
  223.V.

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Electrical Machines
Ward-Leonard system for controlling the speed of a DC motor is used where

 The accuracy in speed control is required.
 All of above.
 Very fine speed control over the whole range from zero to normal speed is required.
 The speed in both the direction is required.

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