Question 21 : What is the working of the conv2() command?
1. 2-d convolution
2. 1-d convolution
3. 3-d convolution
4. n-d convolution
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Question 22 : For a causal L.T.I. system, the impulse response is 0 for _________
1. t<0
2. t=0
3. t>0
4. Always
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Question 23 : The R.O.C. of a unit step function is __________
1. |z|>|1|
2. Entire z plane except z=0
3. Entire z plane except z=∞
4. Does not exist
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