engineering recuitment HPCL Engineer Mock Test 2024 Electrical Machines DC Motor DC Motor Speed Control
The drawbacks of ‘Armature Resistance Control’ method of speed control of a dc motor are
1. A large amount of power is lost in the external resistance R
2. This method gives the speed below normal values
3. For a specified value of R, speed reduction is not constant. It varies with motor load
Which of the above statements are correct?
1
1, 2 and 3
2
1 and 2 only
3
1 and 3 only
4
2 and 3 only