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What does this block do?

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What does this block do?

(a) Checks whether the input signal is non-zero

(b) Check whether the output signal is non-zero

(c) Checks whether a signal is zero

(d) Checks whether we have a ground in the circuit

I have been asked this question during an online exam.

This is a very interesting question from Simulation in division SIMULINK and GUIs of MATLAB

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The correct choice is (c) Checks whether a signal is zero

To explain I would say: The given block checks whether the input given to this block is 0 or not. If it’s 0, the block returns an error.

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