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337.

The polar diagram of a conditionally stable system for open loop gain K=1 is shown in figure. The open loop transfer function of the system is known to be stable. The closed loop system is stable for

[2 marks]
(A) K<5 and 1/2 < K< 1/8
(B) K<1/8 and 1/2 < K< 5
(C) K<1/8 and 5 < K
(D) K<1/8 and K < 5

asked in Electronics and Communication Engineering, 2005

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338.

For a signal x(t) the Fourier transform is X(f). Then the inverse Fourier transform of X (3f + 2) is given by [2 marks]
(A) 1/2 x(1/2) e^j3πt
(B) 1/3 x(1/3) e^(-j4πt)/3
(C) 3 x(3t) e^-j4πt
(D) x(3t+2)

asked in Electronics and Communication Engineering, 2005

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339.

A signal x(n) = sin(ω_ot+φ) is the input to a linear time-invariant system having a frequency response H(e^jω). If the output of the system is Ax(n-n_o) then the most general form of ∠H(e^jω) will be [2 marks]
(A) −n_oω_o + β for any arbitrary real β.
(A) −n_oω_o + 2πk for any arbitrary integer k.
(A) n_oω_o + 2πk for any arbitrary integer k.
(A) −n_oω_o + φ

asked in Electronics and Communication Engineering, 2005

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340.

Match the following and choose the correct combination:

Group 1 Group 2

E. continuous and aperiodic signal 1. Fourier representation is continuous and aperiodic

F. continuous and periodic signal 2. Fourier representation is discrete and aperiodic

G. discrete and aperiodic signal 3. Fourier representation is continuous and periodic

H. discrete and periodic signal 4. Fourier representation is discrete and periodic

[2 marks]
(a) E – 3, F – 2, G – 4, H - 1
(b) E – 1, F – 3, G – 2, H - 4
(c) E – 1, F – 2, G – 3, H - 4
(d) E – 2, F – 1, G – 4, H - 3

asked in Electronics and Communication Engineering, 2005

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