# Questions tagged [system]

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### Time-invariant system question

I seem to struggle with the notations and concepts used in signals & systems. The book states, given that x2(t) = x1(t-T), x2(2t-5) is equal to x1(2t-5-T). This might be a dumb question, but ...
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### Can we connect Earth , Neutral and Digital Ground together in electronics system?

In our project has Digital Ground , Earth and Neutral. As per the requirement Digital Ground and Earth ground tied through Bead inductor. Is it advisable to connect Neutral with Chassis and Digital ...
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### Power system fault analysis

I have been stuck in this problem for identify the fault location. Can anyone show me where to start on this? I'm not familiar with reading the curves so please just give me any hint. Thank you
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### Find impulse response for given difference equation

I have trouble understanding this. I am given this difference equation: $$y[n+2]-3y[n+1]+2[n] = 2u[n+1] -2u[n]$$ and I need to find the response for Kronecker delta function. I can do z transform ...
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### General expression for non-unity gain feedback system's steady state error with disturbance

Thanks in advance for having a look. I finally have some time on my hands to go back through my controls systems text and I want to understand how the general expression is derived; rather than just ...
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### Is the following system time-invariant or time-varying?

I was wondering if the following system is time-invariant or time-varying $$y(t)=e^{-t}\int_{0}^{t}e^{\sigma}x(\sigma+1)d\sigma$$ I know that it's not causal, and I think it's time-varying because of ...
77 views

### Why a system is causal if the impulse response is zero for $t<0$?

I was reading a definition that Suppose $h(t)$ is the impulse response of any system $Y$, then the system is causal if and only if $h(t)=0$ for $\forall t<0$ I know what a causal ...
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### A question on the response of an RC circuit and pole of its transfer function

Below is an excerpt from an introductory level book about poles and zeros: The transfer function of the RC circuit system above for the output voltage is: H(s) = s/(s+10) The book claims that this ...
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### How to determine a system is stable without knowing the input?

I was doing some exercises for an upcoming exam and ran into this. I am not sure how to find if the system is stable without knowing the actual input (since Routh array is the only method I'm familiar ...
329 views

### Is sinking mode and open drain the same concept in electronics?

I'm reading a few manuals about I2C , SPI where it says I2C ports are open drain,which I don't know what it is. I know about sinking mode and sourcing mode of ports in electronic circuits.
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### Oscilloscope sensors (as a system) [closed]

Today in Introduction to Engineering class my teacher picked me to name what components are in the Oscilloscope, in terms of: Input Components, Display Components, Actuators, Sensors, and Controllers. ...
224 views

### IEEE 4 machine system: Need help in computing the bus admittance matrix

I need help in computing the bus admittance matrix for the following Kundur's 4 machine 2 area system: ...
164 views

### Basic Memory Sytem for ARM-based system

I am studying ARM Architecture and there is a slide which I didn't understand and can't find anywhere on the internet (Google, YouTube) - I've also looked for ARM homepage but they don't display any ...
Why the impulse response of this system: $y(n)=\sum_{|k|\leq3}^{}x(n-k)$ is: $h(n)=\sum_{|k|\leq3}^{}\delta(n-k)$ and the impulse response of this one: $y(n)=\sum_{k=0}^{+\infty}x(n-k)$ is:...