Test: Polar And Bode Plots - Electrical Engineering (EE) MCQ
29 Questions MCQ Test - Test: Polar And Bode Plots
The polar plot of a transfer function passes through the critical point (-1,0). Gain margin is
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Consider the following statements:
1. The effect of feedback is to reduce the system error
2. Feedback increases the gain of the system in one frequency range but decreases in another
3. Feedback can cause a system that is originally stable to become unstable
Which of these statements are correct.
1. The effect of feedback is to reduce the system error
2. Feedback increases the gain of the system in one frequency range but decreases in another
3. Feedback can cause a system that is originally stable to become unstable
Which of these statements are correct.
The open loop transfer function of a system is G(s) H(s)= K / (1+s)(1+2s)(1+3s)
The phase cross over frequency ωc is
If the gain of the open-loop system is doubled, the gain margin
The unit circle of the Nyquist plot transforms into 0dB line of the amplitude plot of the Bode diagram at
Consider the following statements:
The gain margin and phase margin of an unstable system may respectively be
1. Positive, positive
2. Positive, negative
3. Negative, positive
4. Negative, negative
Of these statements
If a system has an open loop transfer function1-s / 1+s, then the gain of the system at frequency of 1 rad/s will be
The polar plot of the open loop transfer function of a feedback control system intersects the real axis at -2. The gain margin of the system is
For the transfer function
G(s) H(s) = 1 / s(s+1) (s+0.5), the phase cross-over frequency is
The gain margin (in dB) of a system having the loop transfer function
G(s) H(s) = 2 / s(s+1) is
The gain margin for the system with open loop transfer function
G(s) H(s) = G(s) =2(1+s) / s2 is
Statement 1: In constant M circles, as M increases from 1 to 8 radius of circle increases from 0 to 8 and Centre shifts from (-1,0) to (-8,0)
Statement 2: The circle intersects real axis at point (-1/2, 0)
Assertion (A): Relative stability of the system reduces due to the presence of transportation lag.
Reason (R): Transportation lag can be conveniently handled by Bode plot.
Assertion (A): The phase angle plot in Bode diagram is not affected by the variation in the gain of the system.
Reason(R): The variation in the gain of the system has no effect on the phase margin of the system.
A system has poles at 0.01 Hz, 1 Hz and 80Hz, zeroes at 5Hz, 100Hz and 200Hz. The approximate phase of the system response at 20 Hz is :
The constant M-circle represented by the equation x^2+2.25x+y^2=-1.25 has the value of M equal to:
What is the value of M for the constant M circle represented by the equation 8x2+18x+8y2+9=0?
The constant N loci represented by the equation x^2+x+y^2=0 is for the value of phase angle equal to:
All the constant N-circles in G planes cross the real axis at the fixed points. Which are these points?
Consider the following statements:
Nichol’s chart gives information about.
i. Closed loop frequency response.
ii. The value of the peak magnitude of the closed loop frequency response Mp.
iii. The frequency at which Mp occurs.
Which of the above statements are correct?
Which one of the following statements is correct? Nichol’s chart is useful for the detailed study analysis of:
In a bode magnitude plot, which one of the following slopes would be exhibited at high frequencies by a 4th order all-pole system?
Frequency range of bode magnitude and phases are decided by :
The critical value of gain for a system is 40 and gain margin is 6dB. The system is operating at a gain of:
Nichol’s chart is useful for the detailed study and analysis of:
The roots of the characteristic equation of the second order system in which real and imaginary part represents the :
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