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The frequency of the induced emf in an induction motor is
- a)Greater than the supply frequency
- b)Same as the supply frequency
- c)Lesser as the supply frequency
- d)None of these
Correct answer is option 'C'. Can you explain this answer?
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The frequency of the induced emf in an induction motor isa)Greater tha...
Explanation:
Induction motors operate on the principle of electromagnetic induction, where a rotating magnetic field is produced by the stator winding. This rotating magnetic field induces an emf in the rotor windings, causing it to rotate.
Frequency of induced emf:
- The frequency of the induced emf in an induction motor is determined by the speed of the rotating magnetic field, which is controlled by the supply frequency and the number of poles in the motor.
- The induced emf frequency is given by the formula: f_induced = (supply frequency * number of poles) / 120.
- Since the rotor rotates at a speed slightly less than the synchronous speed, the frequency of the induced emf is slightly less than the supply frequency.
Relation to supply frequency:
- The induced emf frequency is always less than the supply frequency in an induction motor.
- This difference in frequency is known as slip, which is necessary for the rotor to develop torque and rotate.
- The slip frequency allows the rotor to maintain a relative speed with respect to the rotating magnetic field, enabling the motor to operate.
Therefore, the correct answer is option C) Lesser as the supply frequency, as the frequency of the induced emf in an induction motor is always slightly less than the supply frequency due to slip.
Induction motors operate on the principle of electromagnetic induction, where a rotating magnetic field is produced by the stator winding. This rotating magnetic field induces an emf in the rotor windings, causing it to rotate.
Frequency of induced emf:
- The frequency of the induced emf in an induction motor is determined by the speed of the rotating magnetic field, which is controlled by the supply frequency and the number of poles in the motor.
- The induced emf frequency is given by the formula: f_induced = (supply frequency * number of poles) / 120.
- Since the rotor rotates at a speed slightly less than the synchronous speed, the frequency of the induced emf is slightly less than the supply frequency.
Relation to supply frequency:
- The induced emf frequency is always less than the supply frequency in an induction motor.
- This difference in frequency is known as slip, which is necessary for the rotor to develop torque and rotate.
- The slip frequency allows the rotor to maintain a relative speed with respect to the rotating magnetic field, enabling the motor to operate.
Therefore, the correct answer is option C) Lesser as the supply frequency, as the frequency of the induced emf in an induction motor is always slightly less than the supply frequency due to slip.
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Community Answer
The frequency of the induced emf in an induction motor isa)Greater tha...
Explanation:
The frequency of the induced emf in an induction motor depends on the relative speed between the rotating magnetic field produced by the stator and the rotor. Here's a detailed explanation:
1. Supply Frequency: The supply frequency is the frequency of the alternating current (AC) power source that is connected to the motor.
2. Rotating Magnetic Field: The stator of the induction motor produces a rotating magnetic field with a frequency equal to the supply frequency.
3. Slip: The relative speed between the rotating magnetic field and the rotor is known as slip. Slip is determined by the load on the motor and the design of the motor.
4. Induced Emf: The rotor of the induction motor is made of conducting bars. When the rotating magnetic field cuts across these bars, an emf is induced in them. This induced emf is known as the rotor emf.
5. Frequency of Induced Emf: The frequency of the induced emf in the rotor is directly proportional to the slip.
6. Slip and Frequency: As the slip increases, the frequency of the induced emf decreases. This is because the rotor is trying to "catch up" with the rotating magnetic field, resulting in a smaller relative speed between them.
7. Lower Frequency: Therefore, the frequency of the induced emf in the rotor is always lower than the supply frequency. It is important to note that the magnitude of the induced emf can be higher or lower depending on the slip and other factors.
Conclusion: The frequency of the induced emf in an induction motor is always less than the supply frequency. Therefore, the correct answer is C: Lesser than the supply frequency.
The frequency of the induced emf in an induction motor depends on the relative speed between the rotating magnetic field produced by the stator and the rotor. Here's a detailed explanation:
1. Supply Frequency: The supply frequency is the frequency of the alternating current (AC) power source that is connected to the motor.
2. Rotating Magnetic Field: The stator of the induction motor produces a rotating magnetic field with a frequency equal to the supply frequency.
3. Slip: The relative speed between the rotating magnetic field and the rotor is known as slip. Slip is determined by the load on the motor and the design of the motor.
4. Induced Emf: The rotor of the induction motor is made of conducting bars. When the rotating magnetic field cuts across these bars, an emf is induced in them. This induced emf is known as the rotor emf.
5. Frequency of Induced Emf: The frequency of the induced emf in the rotor is directly proportional to the slip.
6. Slip and Frequency: As the slip increases, the frequency of the induced emf decreases. This is because the rotor is trying to "catch up" with the rotating magnetic field, resulting in a smaller relative speed between them.
7. Lower Frequency: Therefore, the frequency of the induced emf in the rotor is always lower than the supply frequency. It is important to note that the magnitude of the induced emf can be higher or lower depending on the slip and other factors.
Conclusion: The frequency of the induced emf in an induction motor is always less than the supply frequency. Therefore, the correct answer is C: Lesser than the supply frequency.
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