Question

The advantage of three-phase induction motor is:

• A. High price
• B. Easy to maintain
• C. Low efficiency
• D. Bad power factor

Answer 1

The Correct Option is B

Three-phase induction motors are widely used in industries due to their robustness, simplicity, and reliability. One of their key advantages is that they are easy to maintain. These motors do not use brushes or commutators, unlike DC motors, which reduces wear and tear and the need for frequent servicing.
(A) High price: Not true. While initial cost may be slightly higher, they are economical over time due to low maintenance.
(B) Easy to maintain: Correct. Simple design and lack of complex parts reduce maintenance needs.
(C) Low efficiency: Incorrect. These motors are generally very efficient.
(D) Bad power factor: Incorrect. In fact, they usually have a reasonably good power factor.