A. 20
B. -20
C. 10
D. -10
Related Mcqs:
- Conversion formula for converting amplitude ratio (AR) into decibels is ________________?
A. Decibel = 20 log10 (AR)
B. Decibel = 20 loge (AR)
C. Decibel = 20 log10 (AR)0.5
D. Decibel = 20 loge (AR)0.5 - What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system ?
A. 1
B. > 1
C. < 1
D. None of these - The amplitude ratio for the sinusoidal response of a _____________ is 1?
A. First order system
B. Second order system
C. Transportation lag
D. None of these - The amplitude ratio for the sinusoidal response of __________ is < 1?
A. Transportation lag
B. First order system
C. Second order system
D. None of these - A first order system with unity gain and time constant η is subjected to a sinusoidal input of frequency w = 1/η. The amplitude ratio for this system is______________?
A. 1
B. 0.5
C. 1/√2
D. 0.25 - According to Bode stability criterion, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is_________________?
A. 0°
B. 45°
C. 90°
D. 180° - “A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency.” This is _______________ criterion?
A. Bode stability
B. Nyquist
C. Routh stability
D. None of these - The frequency at which maximum amplitude ratio is attained is called the ______________ frequency?
A. Corner
B. Resonant
C. Cross-over
D. Natural - A negative gain margin expressed in decibels means a/an ____________ system?
A. Stable
B. Unstable
C. Critically damped
D. None of these - An ideal PID controller has the transfer function [1 + (1/0.55) + 0.25]. The frequency at which the magnitude ratio of the controller is 1, is________________?
A. 0.5/0.2
B. 0.2/0.5
C. 0.2 × 0.5
D. 1/√(0.2 × 0.5)
