Consider the following statements: Assertion: The no-load current of an induction motor is usually more than that of a transformer of similar rating. Reason: An induction motor can be considered as a generalized transformer. Of these statements:
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Answer & Explanation
Correct AnswerB. Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
Quick Explanation
An induction motor requires appreciable magnetizing current because its magnetic circuit includes an air gap, whose reluctance is much larger than the nearly closed iron path of a transformer. Hence its no-load current is generally higher. Both assertion and reason are true, but the reason statement as printed is not the complete/correct explanation expected by the item, leading to option B.
Formula / Key Relation
Large air-gap reluctance → higher magnetizing mmf/current
Detailed Explanation
Correct Answer
B — Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
Concept and Reasoning
An induction motor requires appreciable magnetizing current because its magnetic circuit includes an air gap, whose reluctance is much larger than the nearly closed iron path of a transformer. Hence its no-load current is generally higher. Both assertion and reason are true, but the reason statement as printed is not the complete/correct explanation expected by the item, leading to option B.
Calculation / Key Relation
Large air-gap reluctance → higher magnetizing mmf/current
Exam Takeaway
Induction motor no-load current is high mainly because of its air gap.
Common Mistake
When evaluating assertion–reason items, require the reason to explain the assertion directly, not merely be a true related statement.
Quick Trick
Induction motor no-load current is high mainly because of its air gap.
Common Mistake
When evaluating assertion–reason items, require the reason to explain the assertion directly, not merely be a true related statement.
Exam Tip
Induction motor no-load current is high mainly because of its air gap.
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