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Under no load condition if the applied voltage to an induction motor is reduced from the rated voltage to half the rated value,
- a)Speed decreases, stator current increases
- b)Both speed and stator current decrease
- c)Speed and current remains constant
- d)No change in speed, but current decreases
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
Under no load condition if the applied voltage to an induction motor i...
In an induction motor,
For same torque, s ∝ 1/V2
Therefore, the speed will decrease with a decrease in voltage to half the rated value.
When an induction motor is on no-load and it is operating at rated frequency but at less than the rated voltage,
- Air gap flux will be less than rated flux as ϕ ∝ V/f
- Both Iμ and Iw decreases and hence the no-load current also decreases
- Iron losses decrease as these are directly proportional to the square of the voltage
- Mechanical losses remain constant.
- Constant losses will decrease
- No-load stator copper loses will decrease
- No-load power factor will increase
- Both starting torque and maximum torque are proportional to the square of the voltage and they will decrease.
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Under no load condition if the applied voltage to an induction motor i...
Introduction:
In an induction motor, the speed of the motor is directly proportional to the applied voltage. Under no load condition, when the applied voltage is reduced from the rated voltage to half the rated value, both the speed and stator current of the motor will decrease.
Explanation:
When the applied voltage to an induction motor is reduced from the rated voltage to half the rated value under no load condition, the following changes occur:
1. Speed Decreases:
The speed of an induction motor is directly proportional to the applied voltage. When the voltage is reduced to half the rated value, the speed of the motor will also decrease. This is because the reduced voltage leads to a reduced magnetic field in the motor, resulting in a decrease in the rotating magnetic field and thus the speed of the motor.
2. Stator Current Decreases:
Under no load condition, the stator current of an induction motor is primarily determined by the magnetizing current required to establish the magnetic field for the motor. When the applied voltage is reduced to half the rated value, the magnetizing current decreases, leading to a decrease in the stator current.
Conclusion:
In summary, under no load condition, if the applied voltage to an induction motor is reduced from the rated voltage to half the rated value, both the speed and stator current of the motor will decrease. This is because the reduced voltage results in a decrease in the rotating magnetic field, leading to a decrease in the speed of the motor. Additionally, the magnetizing current required to establish the magnetic field also decreases, resulting in a decrease in the stator current.
In an induction motor, the speed of the motor is directly proportional to the applied voltage. Under no load condition, when the applied voltage is reduced from the rated voltage to half the rated value, both the speed and stator current of the motor will decrease.
Explanation:
When the applied voltage to an induction motor is reduced from the rated voltage to half the rated value under no load condition, the following changes occur:
1. Speed Decreases:
The speed of an induction motor is directly proportional to the applied voltage. When the voltage is reduced to half the rated value, the speed of the motor will also decrease. This is because the reduced voltage leads to a reduced magnetic field in the motor, resulting in a decrease in the rotating magnetic field and thus the speed of the motor.
2. Stator Current Decreases:
Under no load condition, the stator current of an induction motor is primarily determined by the magnetizing current required to establish the magnetic field for the motor. When the applied voltage is reduced to half the rated value, the magnetizing current decreases, leading to a decrease in the stator current.
Conclusion:
In summary, under no load condition, if the applied voltage to an induction motor is reduced from the rated voltage to half the rated value, both the speed and stator current of the motor will decrease. This is because the reduced voltage results in a decrease in the rotating magnetic field, leading to a decrease in the speed of the motor. Additionally, the magnetizing current required to establish the magnetic field also decreases, resulting in a decrease in the stator current.
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Under no load condition if the applied voltage to an induction motor is reduced from the rated voltage to half the rated value,a)Speed decreases, stator current increasesb)Both speed and stator current decreasec)Speed and current remains constantd)No change in speed, but current decreasesCorrect answer is option 'B'. Can you explain this answer?
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Under no load condition if the applied voltage to an induction motor is reduced from the rated voltage to half the rated value,a)Speed decreases, stator current increasesb)Both speed and stator current decreasec)Speed and current remains constantd)No change in speed, but current decreasesCorrect answer is option 'B'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about Under no load condition if the applied voltage to an induction motor is reduced from the rated voltage to half the rated value,a)Speed decreases, stator current increasesb)Both speed and stator current decreasec)Speed and current remains constantd)No change in speed, but current decreasesCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Under no load condition if the applied voltage to an induction motor is reduced from the rated voltage to half the rated value,a)Speed decreases, stator current increasesb)Both speed and stator current decreasec)Speed and current remains constantd)No change in speed, but current decreasesCorrect answer is option 'B'. Can you explain this answer?.
Under no load condition if the applied voltage to an induction motor is reduced from the rated voltage to half the rated value,a)Speed decreases, stator current increasesb)Both speed and stator current decreasec)Speed and current remains constantd)No change in speed, but current decreasesCorrect answer is option 'B'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about Under no load condition if the applied voltage to an induction motor is reduced from the rated voltage to half the rated value,a)Speed decreases, stator current increasesb)Both speed and stator current decreasec)Speed and current remains constantd)No change in speed, but current decreasesCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Under no load condition if the applied voltage to an induction motor is reduced from the rated voltage to half the rated value,a)Speed decreases, stator current increasesb)Both speed and stator current decreasec)Speed and current remains constantd)No change in speed, but current decreasesCorrect answer is option 'B'. Can you explain this answer?.
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Under no load condition if the applied voltage to an induction motor is reduced from the rated voltage to half the rated value,a)Speed decreases, stator current increasesb)Both speed and stator current decreasec)Speed and current remains constantd)No change in speed, but current decreasesCorrect answer is option 'B'. Can you explain this answer?, a detailed solution for Under no load condition if the applied voltage to an induction motor is reduced from the rated voltage to half the rated value,a)Speed decreases, stator current increasesb)Both speed and stator current decreasec)Speed and current remains constantd)No change in speed, but current decreasesCorrect answer is option 'B'. Can you explain this answer? has been provided alongside types of Under no load condition if the applied voltage to an induction motor is reduced from the rated voltage to half the rated value,a)Speed decreases, stator current increasesb)Both speed and stator current decreasec)Speed and current remains constantd)No change in speed, but current decreasesCorrect answer is option 'B'. Can you explain this answer? theory, EduRev gives you an
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