engineering recuitment NHPC JE & THDC JE 2023 Mock Test Electrical Machines DC Motor DC Motor Speed Control
Below are statements regarding the ‘Armature Resistance Control’ method of speed control of a DC motor.
1. This method gives the speed below normal values.
2. A large amount of power is lost across external resistance.
3. This speed control method is used only for small motors.
4. It is a less efficient technique.
Which of the above statements is incorrect?
1
1 and 4
2
2 and 4
3
2 and 3
4
None of these