Q. A signal m(t) is multiplied by a sinusoidal waveform of frequency fc such that

v(t)=m(t) cos 2πfct

If Fourier transform of m(t) is M(f), Fourier transform of v(t) will be

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Q. A voltage wave having 5% fifth harmonic content is applied to a series RC circuit. The percentage fifth harmonic content in the current wave will be

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Q. δ(t) is a

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Q. The analog signal given below is sampled by 600 samples per second for m(t) = 3 sin 500 πt + 2 sin 700 πt, then folding frequency is

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Q. If H(f) = y(t)/x(t), then for this to be true x(t) is

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Q. The analog signal m(t) is given below m(t) = 4 cos 100 πt + 8 sin 200 πt + cos 300 πt, the Nyquist sampling rate will be

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Q. The ROC of sequence in the Z.T. of sequence x[n] = aⁿ ∪ [n] is

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Q. In Laplace transform, multiplication by e^(-at) in time domain becomes

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Q. The F.T. of a conjugate symmetric function is always

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Q. Which one is time invariant system?

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Q. The Fourier series representation of a periodic current (2 + 6√2 cos ωt +√48 sin 2ωt) A. The effective value is

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Q. If X(z) = z+z¯³ / z+z¯¹, then x(n) series has

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Q. If f=0

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Q. An ac circuit has an impedance of (2 - j 9) Ω for third harmonic. The impedance for fundamental is

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Q. The ROC of sequence x[n] = (0.8)ⁿ ∪[n] + (0.4)ⁿ ∪[n]

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Q. Pick the odd one

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Q. Assertion (A): L[af1(t) + bf2(t)] = aF1(s) - bF2(s)

Reason (R): Initial value theroem enables us to find the value of f(t) at t = 0 directly from F(s)

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Q. The Laplace transform of impulse δ(t) is

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Q. The impulse response of discrete time system is x[n] = (4)ⁿ ∪ [3 - n], the system is

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Q. If F(s) is the Laplace transform of f(t) then Laplace transform of df(t)/dt =

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