Signals and Systems - ECE Questions and Answers

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Which one condition is true to check the periodically for discrete time signal (where K is any integer, N is period, f₀ is frequency of signal)

f₀ = K/N

f₀ = K + N

f₀ = KN

f₀ = N/K

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If v(t) = 0 for t < 0 and e^-at for t ≥ 0 V(jω) = 1/(a + jω).

True

False

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The term 'energy spectral density' is associated with

periodic waveform

non-periodic waveform

both perodic and non -perodic waveform

none of the above

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If f(t) = 1, F(jω) = 2p δ(ω).

True

False

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Short circuit is the dual of open circuit.

True

False

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Highest value of Autocorrelation of a function 100 cos 50 pt is

100

zero

100/p

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The Laplace transform of (tⁿ-1) where n is integer is

1/sⁿ

(n - 1)!/sⁿ

n!/sⁿ

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Which one of the following is the correct statement? The region of convergence of z transform of x[n] consists of the values of z for which x[n] r^-n is

absolutely integrable

absolutely summable

unity

< 1

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The data about p the pull required to lift a weight wby a pulley block is

The linear law p = a + bw is

3.2 + 0.171 w

2.28 + 0.1879 w

1.2 + 0.25 w

0.6 + 0.3 w