The coefficient of fluctuation of speed of flywheel is
1. ratio of maximum and minimum speeds during the cycle
2. ratio of maximum fluctuation of speed to the mean speed
3. ratio of mean speed to maximum fluctuation of speed during the cycle
4. sum of maximum fluctuation of speed and the mean speed
1. ratio of maximum and minimum speeds during the cycle
2. ratio of maximum fluctuation of speed to the mean speed
3. ratio of mean speed to maximum fluctuation of speed during the cycle
4. sum of maximum fluctuation of speed and the mean speed