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Gemshorn
Frequency controls the color of the light.
There is no best frequency. If you train a dog correctly any frequency the dog can hear will control it. Your voice, whistle, 'silent' whistle. All are acceptable.
In industrial, there is a device called variable frequency drive (allso frequency inverter, ac drive) to control the motor speed by adjusting output frequency.
Volume Control Light Control Speed/Frequency Control Temperature Control
what do you mean by terms under damped, critical damped and over damped frequency of control system?
Power sharing between two areas occurs through these tie-lines. Load frequency control, as the name signifies, regulates the power flow between different areas while holding the frequency constant.
it is range of frequency variation for which governor does not take any proportional corrective action.
The VCO is a special type of oscillator that has a frequency controlled by an applied voltage.The frequency of the VCO without any control signal applied is called the free running frequency.
Design of filtering and control systems is usually easier in the frequency domain than in the time domain.
Frequency drives are an adjustable-speed drive used for electro-mechanical drive systems. They control the motor speed and torque by varying motor input frequency and voltage.