Explore topic-wise MCQs in Control Systems.

This section includes 21 Mcqs, each offering curated multiple-choice questions to sharpen your Control Systems knowledge and support exam preparation. Choose a topic below to get started.

1.

Nichol’s chart is useful for the detailed study and analysis of:

A. Closed loop frequency response
B. Open loop frequency response
C. Close loop and open loop frequency responses
D. open loop and Close loop frequency responses
Answer» B. Open loop frequency response
Discussion
2.

OLTF contains one zero in right half of s-plane then

A. Open loop system is unstable
B. Close loop system is unstable
C. Close loop system is unstable for higher gain
D. Close loop system is stable
Answer» D. Close loop system is stable
Discussion
3.

In a bode magnitude plot, which one of the following slopes would be exhibited at high frequencies by a 4th order all-pole system?

A. -80dB/decade
B. -40 dB/decade
C. 40 dB/decade
D. 80 dB/decade
Answer» B. -40 dB/decade
Discussion
4.

Which one of the following statements is correct? Nichol’s chart is useful for the detailed study analysis of:

A. Closed loop frequency response
B. Open loop frequency response
C. Close loop and open loop frequency responses
D. None of the above
Answer» B. Open loop frequency response
Discussion
5.

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?

A. 2 and 3
B. 1 and 2
C. 1 and 3
D. 1,2 and 3
Answer» E.
Discussion
6.

The constant N loci represented by the equation x^2+x+y^2=0 is for the value of phase angle equal to:

A. -45°
B. 0°
C. 45°
D. 90°
Answer» E.
Discussion
7.

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. Both A and R are true but R is correct explanation of A
B. Both A and R are true but R is correct explanation of A
C. A is true but R is false
D. A is false but R is true
Answer» D. A is false but R is true
Discussion
8.

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.

A. Both A and R are true but R is correct explanation of A
B. Both A and R are true but R is correct explanation of A
C. A is true but R is false
D. A is false but R is true
Answer» C. A is true but R is false
Discussion
9.

WHICH_ONE_OF_THE_FOLLOWING_STATEMENTS_IS_CORRECT?_NICHOL‚ÄÖ√Ñ√∂‚ÀÖ√Ë‚ÀÖ¬•S_CHART_IS_USEFUL_FOR_THE_DETAILED_STUDY_ANALYSIS_OF:?$#

A. Closed loop frequency response
B. Open loop frequency response
C. Close loop and open loop frequency responses
D. None of the above
Answer» B. Open loop frequency response
Discussion
10.

Frequency range of bode magnitude and phases are decided by :$

A. The lowest and higher important frequencies of dominant factors of the OLTF
B. The lowest and highest important frequencies of all the factors of the open loop transfer function
C. Resonant frequencies of the second factors
D. None of the above
Answer» E.
Discussion
11.

In_a_bode_magnitude_plot,_which_one_of_the_following_slopes_would_be_exhibited_at_high_frequencies_by_a_4th_order_all-pole_system?$

A. -80dB/decade
B. -40 dB/decade
C. 40 dB/decade
D. 80 dB/decade
Answer» B. -40 dB/decade
Discussion
12.

The roots of the characteristic equation of the second order system in which real and imaginary part represents the :

A. Damped frequency and damping
B. Damping and damped frequency
C. Natural frequency and damping ratio
D. Damping ratio and natural frequency
Answer» C. Natural frequency and damping ratio
Discussion
13.

Nichol’s chart is useful for the detailed study and analysis of:$

A. Closed loop frequency response
B. Open loop frequency response
C. Close loop and open loop frequency responses
D. open loop and Close loop frequency responses
Answer» B. Open loop frequency response
Discussion
14.

The critical value of gain for a system is 40 and gain margin is 6dB. The system is operating at a gain of:

A. 20
B. 40
C. 80
D. 120
Answer» B. 40
Discussion
15.

OLTF_contains_one_zero_in_right_half_of_s-plane_then

A. Open loop system is unstable
B. Close loop system is unstable
C. Close loop system is unstable for higher gain
D. Close loop system is stable
Answer» D. Close loop system is stable
Discussion
16.

All the constant N-circles in G planes cross the real axis at the fixed points. Which are these points?

A. -1 and origin
B. Origin and +1
C. -0.5 and 0.5
D. -1 and +1
Answer» B. Origin and +1
Discussion
17.

The constant N loci represented by the equation x^2+x+y^2=0 is for the value of phase angle equal to:

A. -45°
B. 0°
C. 45°
D. 90°
Answer» E.
Discussion
18.

What is the value of M for the constant M circle represented by the equation 8x2+18x+8y2+9=0?

A. 0.5
B. 2
C. 3
D. 8
Answer» D. 8
Discussion
19.

The constant M-circle represented by the equation x^2+2.25x+y^2=-1.25 has the value of M equal to:

A. 1
B. 2
C. 3
D. 4
Answer» D. 4
Discussion
20.

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 :

A. -90°
B. 0°
C. 90°
D. -180°
Answer» B. 0¬¨¬®‚Äö√†√ª
Discussion
21.

Assertion (A): Relative stability of the system reduces due to the presence of transportation lag.

A. : Transportation lag can be conveniently handled by Bode plot.
B. Both A and R are true but R is correct explanation of A
C. Both A and R are true but R is correct explanation of A
D. A is true but R is false
Answer» C. Both A and R are true but R is correct explanation of A
Discussion