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1 . A signal x(n) = sin(w0n + f ) is the input to a
linear time-invariant system having a frequency response H(e^jw ). If
the output of the system Ax(n - n0), then the most general form of
ÐH(ejw) will be

A. - n0w0 + b  for any arbitrary real b.
B. - n0w0 + 2pk for any arbitrary integer k.
C. n0w0 + 2pk for any arbitrary integer k.
D. -n0w0 f.

_________________________

2. Noise with uniform power spectral density of
NW/Hz is passed through a filter H (w) = 2 exp(-jwtd) followed by an
ideal low pass filter of bandwidth BHz. The output noise power in Watts
is

A. 2NB
B. 4NB
C. eNB
D. 16 NB

_________________________

3. The state variable equations of a system are:

i.  x1 = - 3×1 - x2 + u

ii.  x1 = 2×1, y  = x1 + u

The system is

A. controllable but not observable
B. observable but not controllable
C. neither controllable nor observable
D. controllable and observable

_________________________

4. A 1 mW video signal having a bandwidth of 100
MHz is transmitted to a receiver through a cable that has 40 dB loss.
If the effective one-sided noise spectral density at the receiver is
10-20 Watt/Hz, then the signal-to-noise ratio at the receiver is

A. 50 dB
B. 30 dB
C. 40 dB
D. 60 dB

Ans are:

1-B
2-B
3-D
4-A

Author	Message
Neha Agarwal Groupie Joined: 04Jan2007 Online Status: Offline Posts: 59	Topic: ECE Questions........... Posted: 15Feb2007 at 12:57pm
	1 . A signal x(n) = sin(w0n + f ) is the input to a linear time-invariant system having a frequency response H(e^jw ). If the output of the system Ax(n - n0), then the most general form of ÐH(ejw) will be A. - n0w0 + b for any arbitrary real b. B. - n0w0 + 2pk for any arbitrary integer k. C. n0w0 + 2pk for any arbitrary integer k. D. -n0w0 f. _________________________ 2. Noise with uniform power spectral density of NW/Hz is passed through a filter H (w) = 2 exp(-jwtd) followed by an ideal low pass filter of bandwidth BHz. The output noise power in Watts is A. 2NB B. 4NB C. eNB D. 16 NB _________________________ 3. The state variable equations of a system are: i. x1 = - 3×1 - x2 + u ii. x1 = 2×1, y = x1 + u The system is A. controllable but not observable B. observable but not controllable C. neither controllable nor observable D. controllable and observable _________________________ 4. A 1 mW video signal having a bandwidth of 100 MHz is transmitted to a receiver through a cable that has 40 dB loss. If the effective one-sided noise spectral density at the receiver is 10-20 Watt/Hz, then the signal-to-noise ratio at the receiver is A. 50 dB B. 30 dB C. 40 dB D. 60 dB Ans are: 1-B 2-B 3-D 4-A
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