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When load on a synchronous motor is increased, its armature currents in increased provided it is
Normally-excited
Over-excited
Under-excited
All of the above
All of the above
When the load on a synchronous motor is increased, its armature current increases for all excitation conditions: normally-excited, over-excited, and under-excited. Hence, the correct answer is D (All of the above).
When the load on a synchronous motor is increased, its armature current increases for all excitation conditions: normally-excited, over-excited, and under-excited. Hence, the correct answer is D (All of the above).
IaтАЛ=ZVтАЛ тАФ Armature current in a synchronous motor
Q=VтЛЕIaтАЛтЛЕsin(╧Х) тАФ Reactive power formula
As the load on the synchronous motor increases, the demand for reactive power also rises. The motor attempts to maintain synchronism by adjusting its excitation to draw more armature current, irrespective of whether it is normally, over, or under-excited.
The synchronous motor can be stable in all excitation scenarios under load variation.
Increased armature current signifies the motor's response to load changes, ensuring operation remains efficient.
Stable operation over a wide range of loads.
Flexible performance with different excitation conditions for optimal efficiency.
Poor efficiency at no-load or light-load conditions.
Requires precise control systems for excitation adjustment.
Power factor correction in industrial systems.
Large rotating machinery requiring constant speed.
Typical synchronous motors operate effectively within a specific range of excitation levels.
Under-excited conditions lead to lagging power factor, while over-excited conditions result in leading power factor.
D is correct тАФ The armature current increases for all excitation conditions during increased load.
Understand the relationship between synchronous motor excitation and load characteristics to effectively handle questions in competitive exams.