Question

technician a says that a pm type motor is more inexpensive than an im type of motor. technician b says that all three - phase motors used in vehicles are either permanent magnet or induction type motors. who is correct?
○ a. technician a
○ b. technician b
○ c. both technician a and technician b
○ d. neither technician a nor technician b

Explanation:

• PM (permanent magnet) motors are generally more expensive than IM (induction motor) type motors due to the cost of rare - earth materials in PM motors. So Technician A is wrong.
• Three - phase motors used in vehicles can also be synchronous reluctance motors etc., not just permanent magnet or induction type motors. So Technician B is wrong.

Answer:

d. Neither Technician A nor Technician B