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In a 3-phase squirrel cage induction motor, applied voltage is reduced to x times its rated value. Then, its starting line current from mains and starting torque by auto-transformer starting would reduce respectively from their corresponding direct switching values by a factor of
- a)x, x2
- b)x, x
- c)x2, x2
- d)x2, x
Correct answer is option 'C'. Can you explain this answer?
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In a 3-phase squirrel cage induction motor, applied voltage is reduced...
Explanation:
Introduction:
In a 3-phase squirrel cage induction motor, the starting current and torque can be reduced by using an auto-transformer starter. When the applied voltage is reduced to x times its rated value, the starting line current and starting torque would reduce by a certain factor. The factor depends on the value of x and the type of starting method used. In this case, we are using an auto-transformer starter.
Auto-Transformer Starting:
Auto-transformer starting is a method of starting a 3-phase squirrel cage induction motor using an auto-transformer. The auto-transformer is connected in series with the motor during the starting process. The auto-transformer reduces the voltage applied to the motor and hence reduces the starting current and torque. The auto-transformer has a tapping that can be adjusted to vary the starting voltage.
Reduction factor:
When the applied voltage is reduced to x times its rated value, the starting line current and starting torque would reduce by a certain factor. The reduction factor depends on the value of x and the type of starting method used. In this case, we are using an auto-transformer starter.
The reduction factor for the starting line current is given by:
$K_{I} = \dfrac{1}{x}$
The reduction factor for the starting torque is given by:
$K_{T} = \dfrac{1}{x^{2}}$
Answer:
Therefore, when the applied voltage is reduced to x times its rated value, the starting line current from mains and starting torque by auto-transformer starting would reduce respectively from their corresponding direct switching values by a factor of x2, x. Hence, the correct answer is option C.
Introduction:
In a 3-phase squirrel cage induction motor, the starting current and torque can be reduced by using an auto-transformer starter. When the applied voltage is reduced to x times its rated value, the starting line current and starting torque would reduce by a certain factor. The factor depends on the value of x and the type of starting method used. In this case, we are using an auto-transformer starter.
Auto-Transformer Starting:
Auto-transformer starting is a method of starting a 3-phase squirrel cage induction motor using an auto-transformer. The auto-transformer is connected in series with the motor during the starting process. The auto-transformer reduces the voltage applied to the motor and hence reduces the starting current and torque. The auto-transformer has a tapping that can be adjusted to vary the starting voltage.
Reduction factor:
When the applied voltage is reduced to x times its rated value, the starting line current and starting torque would reduce by a certain factor. The reduction factor depends on the value of x and the type of starting method used. In this case, we are using an auto-transformer starter.
The reduction factor for the starting line current is given by:
$K_{I} = \dfrac{1}{x}$
The reduction factor for the starting torque is given by:
$K_{T} = \dfrac{1}{x^{2}}$
Answer:
Therefore, when the applied voltage is reduced to x times its rated value, the starting line current from mains and starting torque by auto-transformer starting would reduce respectively from their corresponding direct switching values by a factor of x2, x. Hence, the correct answer is option C.
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In a 3-phase squirrel cage induction motor, applied voltage is reduced to x times its rated value. Then, its starting line current from mains and starting torque by auto-transformer starting would reduce respectively from their corresponding direct switching values by a factor ofa)x, x2 b)x, xc)x2, x2 d)x2, xCorrect answer is option 'C'. Can you explain this answer?
Question Description
In a 3-phase squirrel cage induction motor, applied voltage is reduced to x times its rated value. Then, its starting line current from mains and starting torque by auto-transformer starting would reduce respectively from their corresponding direct switching values by a factor ofa)x, x2 b)x, xc)x2, x2 d)x2, xCorrect answer is option 'C'. 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 In a 3-phase squirrel cage induction motor, applied voltage is reduced to x times its rated value. Then, its starting line current from mains and starting torque by auto-transformer starting would reduce respectively from their corresponding direct switching values by a factor ofa)x, x2 b)x, xc)x2, x2 d)x2, xCorrect answer is option 'C'. 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 In a 3-phase squirrel cage induction motor, applied voltage is reduced to x times its rated value. Then, its starting line current from mains and starting torque by auto-transformer starting would reduce respectively from their corresponding direct switching values by a factor ofa)x, x2 b)x, xc)x2, x2 d)x2, xCorrect answer is option 'C'. Can you explain this answer?.
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