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In a synchronous motor, the breakdown torque will be _________ to Applied voltage V
proportional
square proportional
inversely proportional
inversely square proportional
proportional
The correct answer is A (proportional). In a synchronous motor, the breakdown torque is directly proportional to the applied voltage (V). This means that as the voltage increases, the breakdown torque also increases.
The correct answer is A (proportional). In a synchronous motor, the breakdown torque is directly proportional to the applied voltage (V). This means that as the voltage increases, the breakdown torque also increases.
Tbreakdown∝V — Breakdown Torque proportional to Voltage
This relationship occurs because the torque developed in a synchronous motor depends on the magnitude of the stator voltage, which influences the field strength. Higher applied voltage results in greater field excitation, leading to increased torque capabilities.
The synchronous motor maintains synchronism with the rotating magnetic field.
The breakdown torque is essential for determining the stability of the motor under varying loads.
High efficiency at synchronous speed.
Provides constant speed irrespective of load conditions.
Requires starting means to bring it up to synchronous speed.
Performance affected by changes in load torque.
Used in applications requiring constant speed and high reliability.
Common in industrial drives, power generation, and synchronous condensers.
The breakdown torque is the maximum torque that a synchronous motor can develop without losing synchronism.
Option B is incorrect because the relationship is linear, not quadratic.
A is correct — Breakdown torque increases linearly with applied voltage.
Understand the characteristics of synchronous motors well, as they are commonly tested in both electrical engineering and power systems sections.