Signal Processing MCQ Questions & Answers

1

A linear system has the transfer function $$H\left( {j\omega } \right) = \frac{1}{{\left( {j\omega + 1} \right)}}$$
When it is subjected to an input white noise process with a constant spectral density 'A', the spectral density of the output

A) $$\frac{A}{{\left( {j\omega + 1} \right)}}$$ B) $$\frac{A}{{{{\left( {j\omega + 1} \right)}^2}}}$$ C) $$\frac{A}{{\left( {{\omega ^2} + 1} \right)}}$$ D) $$\frac{A}{{\sqrt {\left( {j\omega + 1} \right)} }}$$

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Answer & Solution

Answer: Option C

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2

x(t) = 5 e^j20πt is

A) A power signal B) An energy signal C) Neither D) Both

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Answer & Solution

Answer: Option A

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3

For an N-point FFT algorithm with N = 2^m, which one of the following statements is TRUE

A) It is not possible to construct a signal flow graph with both input and output in normal order B) The number of butterflies in the m^th state is N/m C) In-place computation requires storage of only 2N node data D) Computation of a butterfly requires only one complex multiplication

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Answer & Solution

Answer: Option D

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4

In digital control scheme, selection of a large sampling interval:

A) Improve the steady-state performance B) Deteriorates the steady-state performance C) Has no effect on steady-state performance D) None of the above

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Answer & Solution

Answer: Option C

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5

Which one of the following relations is not correct?

A) $$f\left( t \right)\delta \left( t \right) = f\left( 0 \right)\delta \left( t \right)$$ B) $$\int_{ - \infty }^\infty {f\left( t \right)\delta \left( \tau \right)d\tau = 1} $$ C) $$\int_{ - \infty }^\infty {\delta \left( \tau \right)d\left( \tau \right) = 1} $$ D) $$f\left( t \right)\delta \left( {t - \tau } \right) = f\left( \tau \right)\delta \left( {t - \tau } \right)$$

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Answer & Solution

Answer: Option B

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6

Which of the following is non-causal system?

A) y(t) = x(t + 1) B) y(t) = x(t - 1) C) y(t) = x(t) + c D) y(t) = x(t - 1) + c

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Answer & Solution

Answer: Option A

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7

A random variable is uniformly distributed between 3 and 6. Its variance is

A) 0.75 B) 0.25 C) 0.5 D) 1

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Answer & Solution

Answer: Option A

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8

. . . . . . . . is the process of moving a filter mask over the image and computing the sum of products.

A) Correlation B) Convolution C) Interpolation D) Extrapolation

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Answer & Solution

Answer: Option A

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9

Laplace transform is a tool for converting:

A) amplitude domain equations to frequency domain equations B) phase domain equations to amplitude domain equations C) time domain equations to frequency domain equations D) frequency domain equations to time domain equations

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Answer & Solution

Answer: Option C

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10

A band limited signal is sampled at the Nyquist rate. The signal can be recovered by passing the samples through

A) An RC filter B) An envelope detector C) A PLL D) An ideal low-pass filter with the appropriate bandwidth

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Answer & Solution

Answer: Option D

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Signal Processing MCQ Questions & Answers | ECE