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Test: Stability Analysis By Describing Functions - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test - Test: Stability Analysis By Describing Functions

Test: Stability Analysis By Describing Functions for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Test: Stability Analysis By Describing Functions questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Stability Analysis By Describing Functions MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Stability Analysis By Describing Functions below.
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Test: Stability Analysis By Describing Functions - Question 1

The characteristic equation of a feedback control system is given bys3+5s2+(K+6)s+K=0. In the root loci diagram, the asymptotes of the root loci for large K meet at a point in the s plane whose coordinates are: 

Detailed Solution for Test: Stability Analysis By Describing Functions - Question 1

Explanation: The point is calculated by using Routh Hurwitz table and then equating the S0term equal to zero.

Test: Stability Analysis By Describing Functions - Question 2

 The root locus diagram has loop transfer function G(s)H(s) = K/ s(s+4)(s2+4s+5) has 

Detailed Solution for Test: Stability Analysis By Describing Functions - Question 2

Explanation: The breakaway points are the points where the root locus branches break and it is not necessary that this point must lie on the root locus calculated by differentiating the value of K with respect to s and equating it with zero.

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Test: Stability Analysis By Describing Functions - Question 3

 For asymptotes passing from breakaway point then this point is also centroid

Detailed Solution for Test: Stability Analysis By Describing Functions - Question 3

Explanation: Asymptotes are the lines of infinite length and these are tangents to the root locus that meet at infinity and for these, passing from breakaway point then this point is also centroid.

Test: Stability Analysis By Describing Functions - Question 4

Transportation lag is seen in systems:

Detailed Solution for Test: Stability Analysis By Describing Functions - Question 4

Explanation: Transportation lag is the delay that is seen in the systems where the output is not following the input and is seen in systems where the time taken to transfer is very large.

Test: Stability Analysis By Describing Functions - Question 5

Mediums responsible for transportation lag are:

Detailed Solution for Test: Stability Analysis By Describing Functions - Question 5

Explanation: Transportation lag is the delay that is seen in the systems where the output is not following the input and is mainly seen in the practical mediums where the time of transfer is very large.

Test: Stability Analysis By Describing Functions - Question 6

Linear lumped parameter models are not valid under situations as:

Detailed Solution for Test: Stability Analysis By Describing Functions - Question 6

Explanation: Linear lumped parameter models are the models that simplifies the description of the behaviour of spatially distributed physical systems into a topology consisting of discrete systems and not valid when the pure time lags are negligible compared to other lags in the system.

Test: Stability Analysis By Describing Functions - Question 7

 Practically all the systems have transportation lag :

Detailed Solution for Test: Stability Analysis By Describing Functions - Question 7

Explanation: Not all systems have transportation lag but whose transmission time is more.

Test: Stability Analysis By Describing Functions - Question 8

Transportation lag causes :

Detailed Solution for Test: Stability Analysis By Describing Functions - Question 8

Explanation: Transportation lag is the delay that is seen in the systems where the output is not following the input and causes instability in the system.

Test: Stability Analysis By Describing Functions - Question 9

The polar plot of a transfer function passes through the critical point (-1,0).Gain margin is

Detailed Solution for Test: Stability Analysis By Describing Functions - Question 9

Explanation: Gain margin is the point where the at phase cross over frequency gain of the system i 1 dB and of a polar plot passing through the critical point is zero.

Test: Stability Analysis By Describing Functions - Question 10

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.

Detailed Solution for Test: Stability Analysis By Describing Functions - Question 10

Explanation: Feedback can be of two types as positive and negative and cause the increase in gain and also can cause stable system to become unstable.

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