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A synchronous motor with negligible armature resistance runs at a load angle of 20° at the rated frequency. If supply frequency is increased by 10%, keeping the other parameters constant, the new load angle will be
  • a)
    16°
  • b)
    18°
  • c)
    20°
  • d)
    22°
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
A synchronous motor with negligible armature resistance runs at a load...
Power delivered by the synchronous motor

From data, other parameters such as P, E and V are constant.
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A synchronous motor with negligible armature resistance runs at a load...
Degrees. This means that the rotor of the synchronous motor is running slightly ahead of the stator magnetic field by 20 degrees.

The load angle is defined as the angle between the stator magnetic field and the rotor magnetic field. In a synchronous motor, the rotor rotates at the same speed as the stator magnetic field, but due to the inherent magnetic properties of the rotor, it lags behind the stator magnetic field. The load angle is determined by the electrical load on the motor, and can vary depending on the amount of torque the motor is required to produce.

In this case, the negligible armature resistance means that the motor is operating in the ideal condition, with no energy losses due to resistance. This allows the motor to run efficiently and with high power output.

Overall, a synchronous motor with a load angle of 20 degrees is operating efficiently and producing high power output with minimal energy losses.
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A synchronous motor with negligible armature resistance runs at a load angle of 20° at the rated frequency. If supply frequency is increased by 10%, keeping the other parameters constant, the new load angle will bea)16°b)18°c)20°d)22°Correct answer is option 'D'. Can you explain this answer?
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