ECE :: Exam Questions Paper
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Two discrete time systems with impulse responses h1[n] = δ[n - 1] and h2[n] = δ[n - 2] are connected in cascade. The overall impulse response of the cascaded system is
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The magnitude plot of a composite signal x(t) = e2jt + e3jt is
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A message signal given by
is amplitude modulated with a carrier of frequency ωc to generate s(t) = [1 + m(t)] cos ωct -
A 16 bit counter type ADC uses 1 MHz clock then its maximum conversion time is __________ .
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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 function n(x) satisfied the differential equation
where L is a constant. The boundary
conditions are: n(0) = K and n(∞) = 0. The solution to this equation is -
50 independent low pass signals of bandwidth W, 2W, 3W, W, 2W, 3W, W, 2W, 3W Hz are to be time division multiplexer on a common channel using PAM. To achieve this, the minimum transmission capacity of the channel should be __________ .
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Two coils X of 1000 turns and Y of 2000 turns are placed such that 60% of the flux produced by coil X links coil Y. A current of 1 A in coil X produces 0.1 wb flux. The mutual inductance between coils is
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The signal x(t) is described by
Two of the angular frequencies at which its fourier transform becomes zero are
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Hence first order can provide APF.
1.e-jωt = 
