Exercise: Exam Question Papers

Questions for: Exam Question Papers

A signal with ± 10 V ranged and 1 KHz band width is being digitized using a sample and hold circuit and a 10 bit quantizer. The minimum sampling rate is :
A:
62831.9 V/sec
B:
125663.8 V/sec
C:
31415.95 V/sec
D:
None
Answer: A

Maximum sampling rate = 2pfmax V.

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For a series resonant circuit at low frequency circuit impedance is __________ and at high frequency circuit impedance is __________
Fill in the blanks respectively
A:
capacitive, inductive
B:
inductive, capacitive
C:
resistive, inductive
D:
capacitive, resistive
Answer: A

From this curve; we can select option (a) as correct answer.

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A discrete time linear shift-invariant system has an impulse response h[n] with h[0] = 1, h[1] = - 1, h[2] - 2, and zero otherwise. The system is given an input sequence x[n] with x[0] - x[2] - 1, and zero otherwise. The number of nonzero samples in the output sequence y[n], and the value of y[2] are, respectively
A:
5, 2
B:
6, 2
C:
6, 1
D:
5, 3
Answer: D

Use convolution to get the result.

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The open loop transfer function of a unity feedback system is: The range of K for which the system is stable is
A:
B:
13 > K > 0
C:
D:
-6 < K < ∞
Answer: A

Apply R-H.

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If g(t) = e- p t2 then G(0) is __________ (where g(t)⇔ G(f)
A:
B:
unity
C:
D:
impulse at f = 0
Answer: B

The signal g(t) given above is a Gaussian pulse, and it satisfies the relation.

Therefore, its fourier transform is same as the signal itself in frequency domain.

i.e. G(f) = e-pf2

Hence G(f)|f = 0 = e-p(0) = 1.

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