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Examoogle • User • info@examoogle.com • EE-2024-8821
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When a constant power output is desired to maintain ________
Ebsinδ is to be maintained constant
Iacosθ is to be maintained constant
Ebsinδ and Iacosθ are to be maintained constant
Ebsinδ and Iasinθ are to be maintained constant
Ebsinδ and Iacosθ are to be maintained constant
The correct answer is C, which states that both Ebsinδ and Iacosθ are to be maintained constant when a constant power output is desired in synchronous motors. This is essential for stable and efficient operation of the motor.
The correct answer is C, which states that both Ebsinδ and Iacosθ are to be maintained constant when a constant power output is desired in synchronous motors. This is essential for stable and efficient operation of the motor.
P=EbIasinδ — represents the power generated in synchronous motors.
δ = torque angle
In synchronous motors, Eb represents the back electromotive force, while Ia is the armature current. To achieve constant power output, the torque must remain stable, which requires maintaining these two parameters constant, ensuring that the power produced matches the power absorbed by the load.
Synchronous motors operate at constant speed under normal operation.
Power output is a function of both the back EMF and the current flowing through the armature.
High efficiency and performance at rated load.
Ability to control power factor through excitation.
Requires additional equipment for starting.
Sensitive to load variations.
Used in industrial drives requiring high efficiency.
Power plants for synchronous generation.
Standard value or specification includes maintaining voltage levels to ensure operational efficiency.
Option A is incorrect as it mentions only Ebsinδ. Option B is incorrect as it mentions only Iacosθ. Option D contains an incorrect trigonometric function for armature current.
C is correct — both Ebsinδ and Iacosθ must be maintained constant to ensure stable power output in synchronous motors.
In power systems, understanding the power factor and torque angle can significantly enhance your ability to solve related problems in synchronous machines.