In each of the questions given below five words are given in bold. These four words may or may not be in their correct position. The sentence is then followed by options with the correct combination of words that should replace each other in order to make the sentence grammatically and contextually correct. Find the correct combination of the words that replace each other. If the sentence is correct as it is then select option (e) as your choice.

A rugged (A) ceiling fan uses the time -tested induction (B) motor, which is typical (C) but may have limits (D) on energy (E) performance.

The correct answer is Option A-C, meaning the words at positions A (rugged) and C (typical) must be swapped with each other.

Let us first read the original sentence carefully:

"A rugged (A) ceiling fan uses the time-tested induction (B) motor, which is typical (C) but may have limits (D) on energy (E) performance."

Now, let us analyze why this sentence is incorrect as it stands:

Problem 1 — Word A ("rugged"):
The word "rugged" means tough, durable, or built to withstand harsh conditions. Saying "A rugged ceiling fan" at the start of a general statement about ceiling fans sounds contextually off. The sentence is trying to describe a standard or common ceiling fan — not a specifically heavy-duty one. The word that fits this introductory, general context is "typical", meaning ordinary or standard.

Problem 2 — Word C ("typical"):
The word "typical" in position C describes the induction motor. But the entire point of mentioning the "time-tested induction motor" is to praise its durability and reliability. The sentence needs a word that conveys strength and robustness here. The word "rugged" fits perfectly — an induction motor is well-known for being rugged (i.e., sturdy and long-lasting).

After the A-C swap, the corrected sentence reads:

"A typical ceiling fan uses the time-tested induction motor, which is rugged but may have limits on energy performance."

This is now both grammatically correct and contextually meaningful:

• "A typical ceiling fan" → correctly introduces the subject as an ordinary, everyday ceiling fan.
• "uses the time-tested induction motor" → correctly references the well-established motor technology.
• "which is rugged" → correctly praises the induction motor for its durability and toughness.
• "but may have limits on energy performance" → correctly introduces a contrast, noting that despite being rugged, the motor may not be the most energy-efficient option.

The other options (E-C, E-D, B-D) do not produce a logical or grammatically sound sentence, and "No interchange required" is incorrect because the original sentence is clearly flawed.

Therefore, the correct combination is A-C.