# Electronics and Communication Engineering - Signals and Systems - Discussion

2.

Which one most appropriate dynamic system?

 [A]. y(n) + y(n - 1) + y(n + 1) [B]. y(n) + y(n - 1) [C]. y(n) = x(n) [D]. y(n) + y(n - 1) + y(n + 3) = 0

Explanation:

Because present output of y(n) depend upon past y(n - 1) and future y(n + 1).

 Sara said: (Aug 5, 2014) Why option D can't be the answer?

 Khalique said: (Jun 18, 2015) Only option D represents system option A does not represent any system. Hence D must be the correct choice.

 Dhava Perumal said: (Jun 19, 2015) Yes @Mr. Khalique is absolutely correct. Because the system equation must represent some response. So in option D, the response is given but not in A.

 Harry said: (Sep 19, 2015) Sir, in this question objects are wrong please creation y(n) = y(n-1)+y(n+1).

 Nag. said: (Oct 10, 2015) Sir system output does not depends on depends on future I think there is no correct answer.

 Swathipriya said: (Oct 14, 2015) If option A is correct then option D also should be correct. Whoever the author of the question explain with correct answer.

 Y Sarma said: (Jun 30, 2016) I think A and D both are correct. If it's true then we have to choose A as an answer because of priority of order.

 Harini said: (Aug 30, 2016) The dynamic system depends only on past outputs or past inputs and not on future outputs, Hence option A and D can't be correct and option C is a static system. So option B may be the right answer.

 Lasya said: (Sep 10, 2016) Please tell me which is the correct answer?

 Rangu said: (Feb 26, 2017) Dynamic system depends on past Input and past output.

 Lucky said: (Mar 13, 2017) Dynamic system depends upon the past and future input and outputs. So in my view, option A and D are the correct answers.

 Sridevi said: (Apr 29, 2017) Please, tell me the correct answer with the explanation.

 Mohit said: (Jun 2, 2017) The Dynamic system depends on present and past i/p o/p. So option b is correct.

 Ranbir said: (Oct 10, 2017) Option A and D is correct because both past and future value depends, and the option A has more correct than D due to order.

 Chiku said: (Oct 21, 2017) Option A& D both are correct because both system satisfied condition of dynamic.

 Apurva said: (Oct 29, 2017) In Dynamic systems, output depends on present input as well as past or future inputs.

 Nnkundan said: (Nov 18, 2017) Both A and D is correct. But in above question there is a statement given that "one most appropriate". Now option "a" is more appropriate bcoz y(n) + y(n - 1) + y(n + 1) bcoz this dynamic system contains value of +-1 at the same time. If option "D" is given like y(n) + y(n - 3) + y(n + 3) then there is confusion between A and D. But here there is no confusion.

 Swami said: (Jan 25, 2018) How system depends on future output? it is unrealizable and option B is correct.

 Vimala said: (Jun 20, 2018) Option D is correct because A is not a system.

 Joshi said: (Aug 30, 2018) As option A does not have the proper form of expression, so D must be the correct option.

 Vani said: (Oct 13, 2018) Option A doesn't even show the equation of a system, hence option D is the more appropriate answer.

 Lavanya said: (Mar 15, 2019) I think option B is correct.

 Devesh Drishti said: (Mar 6, 2020) Options A and D both are correct. The dynamic system means having a memory which is represented by past and future o/p At given present i/p.