Which one of the following is not necessarily the advantage of D.C. motors over

The correct answer is D. High starting torque.

D.C. motors have a number of advantages over A.C. motors, including:

• Low cost: D.C. motors are typically less expensive than A.C. motors.
• Wide speed range: D.C. motors can be operated over a wide range of speeds, making them ideal for applications where variable speed is required.
• Stability: D.C. motors are more stable than A.C. motors, making them less likely to stall or overheat.

However, D.C. motors do have one disadvantage: they do not have as high of a starting torque as A.C. motors. This means that D.C. motors may not be suitable for applications where a high starting torque is required, such as starting a heavy load.

In conclusion, the correct answer to the question “Which one of the following is not necessarily the advantage of D.C. motors over A.C. motors?” is D. High starting torque.