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Power factor of a synchronous motor is unity when
- a)the armature current is maximum
- b)the armature current is minimum
- c)the armature current is zero
- d)none of the above
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Power factor of a synchronous motor is unity whena)the armature curren...
Explanation:
The power factor of a synchronous motor is defined as the ratio of active power (real power) to the apparent power. It is a measure of how effectively the motor converts electrical power into mechanical power.
Power Factor:
The power factor of a synchronous motor can be leading, lagging, or unity. A leading power factor means the current leads the voltage, a lagging power factor means the current lags the voltage, and a unity power factor means the current is in phase with the voltage.
Armature Current and Power Factor:
The power factor of a synchronous motor is influenced by the armature current. The armature current is the current flowing through the armature winding of the motor. It is responsible for producing the magnetic field that interacts with the stator magnetic field to generate torque.
Unity Power Factor:
A synchronous motor operates at a unity power factor when the armature current is minimum. This is because at minimum armature current, the reactive power component is negligible, and the motor only consumes active power. The power factor is defined as the ratio of active power to apparent power. When the reactive power is zero, the active power and apparent power become equal, resulting in a power factor of unity.
Other Options:
a) When the armature current is maximum, the motor is consuming both active and reactive power. The power factor will be less than unity.
c) When the armature current is zero, the motor is not consuming any power, and the power factor is undefined.
d) None of the above options correctly describe the condition for a unity power factor in a synchronous motor.
Therefore, the correct answer is option 'B' - the armature current is minimum.
The power factor of a synchronous motor is defined as the ratio of active power (real power) to the apparent power. It is a measure of how effectively the motor converts electrical power into mechanical power.
Power Factor:
The power factor of a synchronous motor can be leading, lagging, or unity. A leading power factor means the current leads the voltage, a lagging power factor means the current lags the voltage, and a unity power factor means the current is in phase with the voltage.
Armature Current and Power Factor:
The power factor of a synchronous motor is influenced by the armature current. The armature current is the current flowing through the armature winding of the motor. It is responsible for producing the magnetic field that interacts with the stator magnetic field to generate torque.
Unity Power Factor:
A synchronous motor operates at a unity power factor when the armature current is minimum. This is because at minimum armature current, the reactive power component is negligible, and the motor only consumes active power. The power factor is defined as the ratio of active power to apparent power. When the reactive power is zero, the active power and apparent power become equal, resulting in a power factor of unity.
Other Options:
a) When the armature current is maximum, the motor is consuming both active and reactive power. The power factor will be less than unity.
c) When the armature current is zero, the motor is not consuming any power, and the power factor is undefined.
d) None of the above options correctly describe the condition for a unity power factor in a synchronous motor.
Therefore, the correct answer is option 'B' - the armature current is minimum.
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