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In capacitor start single phase induction motor, the current in the
- a)Supply lines leads the voltage
- b)Starting winding lags the voltage
- c)Main winding leads the voltage
- d)Starting winding leads the voltage
Correct answer is option 'D'. Can you explain this answer?
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In capacitor start single phase induction motor, the current in thea)S...
A Capacitor Start Motors are a single phase Induction Motor that employs a capacitor in the auxiliary winding circuit to produce a greater phase difference between the current in the main and the auxiliary windings. The name capacitor starts itself shows that the motor uses a capacitor for the purpose of the starting.In phase induction motors, we are unable to get starting torque, So we mostly use permanent capacitor split phase starting method in ceiling fans. Its main aim is to split the single phase supply into phases, having time displacement of 90 degrees, also mechanically the windings are placed 90 degrees in space. It gives an rmf which produces a starting torque & makes it a self starting motor. So, the capacitor used in the other auxiliary winding mainly provides this 90 degrees time displacement. An inductor can also be used, but it has the following drawbacksBulky size of the inductor.Leakage reactance of it affects the value of the starting torque.Its delay in current affects the transients.
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In capacitor start single phase induction motor, the current in thea)S...
Capacitor Start Single Phase Induction Motor
In a capacitor start single phase induction motor, an auxiliary winding and a capacitor are used to provide the necessary starting torque. The auxiliary winding is also known as the starting winding.
Explanation:
Working Principle:
- The capacitor start single phase induction motor consists of two windings: the main winding and the starting winding.
- The main winding is designed for high current and low resistance and is responsible for producing the main magnetic field in the motor.
- The starting winding is designed for low current and high resistance and is responsible for producing the starting torque.
- A capacitor is connected in series with the starting winding to create a phase shift between the current in the main winding and the starting winding.
Current and Voltage Relationship:
- When the motor is connected to the power supply, the current in the starting winding leads the voltage across it due to the presence of the capacitor.
- The capacitor creates a phase shift between the current and voltage in the starting winding, causing the current to lead the voltage.
- This phase shift helps in creating a rotating magnetic field in the motor, which in turn produces the necessary starting torque.
- The main winding, on the other hand, does not have a capacitor in series and therefore, the current in the main winding is in phase with the voltage across it.
- Hence, in a capacitor start single phase induction motor, the current in the starting winding leads the voltage and the current in the main winding is in phase with the voltage.
Conclusion:
Option 'D', which states that the starting winding leads the voltage, is the correct answer. The presence of a capacitor in series with the starting winding creates a phase shift between the current and voltage in the starting winding, causing the current to lead the voltage.
In a capacitor start single phase induction motor, an auxiliary winding and a capacitor are used to provide the necessary starting torque. The auxiliary winding is also known as the starting winding.
Explanation:
Working Principle:
- The capacitor start single phase induction motor consists of two windings: the main winding and the starting winding.
- The main winding is designed for high current and low resistance and is responsible for producing the main magnetic field in the motor.
- The starting winding is designed for low current and high resistance and is responsible for producing the starting torque.
- A capacitor is connected in series with the starting winding to create a phase shift between the current in the main winding and the starting winding.
Current and Voltage Relationship:
- When the motor is connected to the power supply, the current in the starting winding leads the voltage across it due to the presence of the capacitor.
- The capacitor creates a phase shift between the current and voltage in the starting winding, causing the current to lead the voltage.
- This phase shift helps in creating a rotating magnetic field in the motor, which in turn produces the necessary starting torque.
- The main winding, on the other hand, does not have a capacitor in series and therefore, the current in the main winding is in phase with the voltage across it.
- Hence, in a capacitor start single phase induction motor, the current in the starting winding leads the voltage and the current in the main winding is in phase with the voltage.
Conclusion:
Option 'D', which states that the starting winding leads the voltage, is the correct answer. The presence of a capacitor in series with the starting winding creates a phase shift between the current and voltage in the starting winding, causing the current to lead the voltage.
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In capacitor start single phase induction motor, the current in thea)Supply lines leads the voltageb)Starting winding lags the voltagec)Main winding leads the voltaged)Starting winding leads the voltageCorrect answer is option 'D'. Can you explain this answer? for Civil Engineering (CE) 2025 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about In capacitor start single phase induction motor, the current in thea)Supply lines leads the voltageb)Starting winding lags the voltagec)Main winding leads the voltaged)Starting winding leads the voltageCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In capacitor start single phase induction motor, the current in thea)Supply lines leads the voltageb)Starting winding lags the voltagec)Main winding leads the voltaged)Starting winding leads the voltageCorrect answer is option 'D'. Can you explain this answer?.
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