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If the damping factor is zero, the unit-step response is(a) Purely sinusoidal(b) Ramp function(c) Pulse function(d) Impulse functionThis question was posed to me during a job interview.This intriguing question originated from Time Response of Control Systems in chapter Control System Applications of MATLAB

Answer»

Right choice is (a) Purely SINUSOIDAL

The best explanation: The generalized time response of a second ORDER control system reduces to a purely sinusoidal FUNCTION when the damping factor is zero. This is because the damping RATIO BECOMES 0. Hence, the correct option is purely sinusoidal.



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