Signals and Systems - ECE Questions and Answers

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If , f(t) =

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For a wave v = V _1m sin (ωt + θ₁ ) - V_3m sin (3ωt + θ₃), the rms value is (0.5 V²_1m + 0.5 V²_3m)^0.5

True

False

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The function in the given figure can be written as

u(t - 1) sin p ( t - 1) - u(t - 3) sin p (t - 3) + u(t - 4) sin p (t - 4) - u(t - 6) sin p (t - 6)

u(t - 1) sin p ( t - 1) - u(t - 3) sin p (t - 3) + u(t - 4) sin p (t - 4)

u(t - 1) sin p ( t - 1) + u(t - 4) sin p (t - 4)

u(t - 1) sin 2p ( t - 1) + u(t - 4) sin 2p (t - 4)

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F.T. of continuous non-periodic signal is

aperiodic

periodic

a and b

none

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consider the following as regards probability distribution function f(x)

f(x) = 0 for all x
cumulative distribution function

which of the above are correct?

1 only

1 and 2 only

1, 2 and 3

1 and 3 only

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Inverse Fourier transform of ∪(ω) is

δ(t)

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Inverse Fourier transform of '1' is

U(t)

δ(t)

'0'

infinite

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Pick out the odd one

stochastic variable

stochastic function

random variable

random experiment

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X and Y are two random variables and Z = X + Y . Letmz, m_z, m_x, m_y represent mean of Z, X and Y. Then

m_z = m_x + m_y

m_z ≤ m_x + m_y

m_z< m_x + m_y

m_z > m_x + m_y