Electrical measurements-Digital Communications MCQs set/8 Sample Test,Sample questions

Question: Sampling can be used in

1.Audio

2. Speech

3.Video

4.All of the mentioned

Question: Which codes perform better?

1.Orthogonal

2.Biorthogonal

3.Orthogonal & Biorthogonal

4.None of the mentioned

Question: A cyclic code can be generated using

1.Generator polynomial

2.Generator matrix

3.Generator polynomial & matrix

4.None of the mentioned

1.Equal

2.Double

3.Half

4.Triple

Question: Biorthogonal set consists of

1.Orthogonal signals

2.Antipodal signals

3.Combination of orthogonal and antipodal

4.None of the mentioned

Question: Block codes are generated using

1.Generator polynomial

2.Generator matrix

3.Generator polynomial & matrix

4.None of the mentioned

Question: Block length is the _____________ in the code word.

1.Number of elements

2.Distance between elements

3.Number of parity bits

4.None of the mentioned

Question: Code strength is characterized by its

1.Minimum distance

2.Maximum distance

3.Code weight

4.Code size

Question: Coding gain is defined as

1.Reduction in Eb/N0

2.Increase in Eb/N0

3.Same as Eb/N0

4.None of the mentioned

1.Dmin + 1

2.Dmin -1

3.Dmin

4.Dmin/2

Question: Extended go-lay code is formed by

1.Adding overall parity bit to perfect go-lay code

2.Ex-oaring overall parity bit with perfect go-lay code

3.Ex-oaring each bit of go-lay code

4.Dividing the overall parity bit with perfect go-lay code

1.Maximum

2.Minimum

3.Zero

4.Infinity

Question: Hamming distance can be given by the number of elements in which

1.They are same

2.They differ

3.Which are non zero

4.None of the mentioned

Question: If the parity bit takes value one then the summation of code-word gives

1.Even result

2.Odd result

3.Even & Odd result

4.None of the mentioned

Question: In a real time communication system addition of redundant bits leads to

1.More bandwidth requirement

2.Faster rate of transmission

3.More bandwidth requirement & Faster rate of transmission

4.None of the mentioned

Question: In binary symmetric channel, in the demodulator _____ decision is made.

1.Hard

2.Soft

3.Hard & Soft

4.None of the mentioned

Question: In Gaussian channel demodulator ______ decision is made.

1.Hard

2.Soft

3.Hard & Soft

4.None of the mentioned

Question: In non orthogonal signalling as k increases there is

2.Improved bandwidth efficiency

3.Increase in required Eb/N0

4.All of the mentioned

Question: In orthogonal signal, all cross correlation coefficients are

1.One

2.Zero

3.Negative

4.None of the mentioned

Question: In orthogonal signalling as k increase there is

1.Improved error performance

3.Improved bandwidth

4.None of the mentioned

1.Quotient

2.Remainder

3.Dividend

4.Divisor

Question: Linear codes are used for

1.Forward error correction

2.Backward error correction

3.Forward error detection

4.Backward error detection

Question: Noise which can affect sampling are

1.Thermal sensor noise

2.Analog circuit noise

3.Thermal sensor & Analog circuit noise

4.None of the mentioned

Question: Nyquist frequency is given by

1.fs

2.2fs

3.fs/2

4.none of the mentioned

Question: Orthogonal vectors are

1.Perpendicular to each other

2.Their dot product must be zero

3.One signal cannot interfere with the other

4.All of the mentioned

Question: Oversampling can completely eliminate

1.Aperture error

2.Non linearity

3.Quantization error

4.All of the mentioned

Question: Reconstruction of continuous signals is done using

1.Decimation algorithm

2.Interpolation algorithm

3.Decimation & Interpolation algorithm

Question: Sampling can be done for functions varying in

1.Space

2.Time

3.Space & Time

4.None of the mentioned

Question: Sampling of simultaneously two different but related wave-forms is called as

1.Over sampling

2.Complex sampling

3.Inter sampling

4.None of the mentioned

Question: Some various types of distortion are

1.Jitter

2.Noise

3.Aperture error

4.All of the mentioned

Question: The capacity per cell is ______ Eb/N0.

1.Directly proportional

2.Inversely proportional

3.Double the

4.Half the

Question: The cyclic codes are designed using

1.Shift registers with feedback

2.Shift registers without feedback

3.Flipflops

4.None of the mentioned

Question: The distance between two code-words is equal to the _____ of the third code-word which is the sum of the first two code-words.

1.Size

2.Weight

3.Minimum distance

4.None of the mentioned

Question: The feedback shift register circuit is called as

1.Multiplying circuit

2.Dividing circuit

3.Feedback circuit

4.Shifting circuit

1.2k

2.K2

3.2k

4.21/k

Question: The minimum distance Dmin can also be given as

1.Dmin >= Î± + Î² + 1

2.Dmin <= Î± + Î² + 1

3.Dmin >= Î± + Î² â€“ 1

4. Dmin <= Î± + Î² + 1

1.Dmin+1

2.Dmin â€“ 1

3.(Dmin+1)/2

4.(Dmin â€“ 1)/2

Question: The probability of message error is written as

1.Block error

2.Word error

3.Block & Word error

4.None of the mentioned

Question: The rate of a block code is the ration of

1.Block length to message length

2.Message length to block length

3.Message weight to block length

4.None of the mentioned

Question: The ratio of redundant bits to data bits is called as

1.Code rate

2.Redundancy rate

3.Symbol rate

4.Transmission rate

Question: The received code contains an error if the syndrome vector is

1.Zero

2.Non zero

3.Infinity

4.None of the mentioned

1.More

2.Less

3.Double

4.Half

Question: The sum of any two vectors in subset S is also in S. This is called as

2.Subset property

3.Closure property

4.Similarity property

1.EX-OR

2.AND

3.OR

4.EX-NOR

Question: To avoid corruption during transmission, the code-word should be

1.Near

2.Far apart

3.Far

4.None of the mentioned

Question: Transorthogonal code is obtained by

1.Deleting last digit of each orthogonal codeword

2. Deleting first digit of each orthogonal codeword

3.Doubling each digit of orthogonal codeword

4.Taking negative of each digit of orthogonal codeword

Question: What is the bit depth used for audio recording?

1.8 bit

2.16 bit

3.24 bit

4.All of the mentioned

Question: Which code requires minimum Eb/N0?

1.Orthogonal

2.Biorthogonal

3.Simplex

4.All of the mentioned

Question: Which decoders are less complex?

1.Soft decision decoder

2.Hard decision decoder

3.Hard & Soft decision decoder

4.None of the mentioned

Question: Which factors are measured using the units of lines per picture height?

1.Resolution

2. Sampling rate

3.Resolution & Sampling rate

4.None of the mentioned

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