Discussion :: Exam Questions Paper
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A first order system will never be able to give a __________ response.
- Band pass
- Band reject
- All pass
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A.
1, 2 and 3 are true
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B.
1 and 3 are true, 2 is false
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C.
1 and 2 are false, 3 is true
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D.
1 and 2 are true, 3 is false
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Answer : Option D
Explanation :
The ideal response of a Band pass filter BRF and APF is as shown
So for BPF we require 0 at ω = 0, p i.e. at least 2 zeroes are required in the Transform.
Hence order has to be atleast 2.
Similarly for band reject filter order should be at least 2. Whereas APF has a constant amplitude.
Hence Zeroes in the function need not matter.
APF function is given as 
Hence first order can provide APF.
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