# Electrical measurements-Digital Communications MCQs set/17 Sample Test,Sample questions

## Question: ``` Which are uniquely decodable codes? ```

1.Fixed length codes

2.Variable length codes

3.Fixed & Variable length codes

4. None of the mentioned

## Question: ```A code is a mapping from ```

1.Binary sequence to dicrete set of symbols

2.Discrete set of symbols to binary sequence

3.All of the mentioned

4.None of the mentioned

## Question: ```A rate distortion function is a ```

1.Concave function

2.Convex function

3.Increasing function

4.None of the mentioned

## Question: ```ASCII code is a ```

1.Fixed length code

2.Variable length code

3.Fixed & Variable length code

4.None of the mentioned

## Question: ```Binary Huffman coding is a ```

1.Prefix condition code

2.Suffix condition code

3.Prefix & Suffix condition code

4.None of the mentioned

1.True

2.False

## Question: ```CRC uses ```

1.Multiplication

2.Binary division

3.Multiplication & Binary division

4.None of the mentioned

## Question: ```Digital signals are easy for ```

1.Storage

2.Handling

3.Time dilation

4.All of the mentioned

## Question: ```Entropy of a random variable is ```

1.0

2.1

3.Infinite

4.Cannot be determined

## Question: ```Error is equal to ```

1.Distance between the data points

2.Square of the distance between the data points

3.Half the distance between the data points

4.None of the mentioned

## Question: ```Gaussian process is a _____ interpolation process. ```

1.Linear

2.Non linear

3.Not an interpolation process

4.None of the mentioned

## Question: ```How error detection and correction is done? ```

1.By passing it through equalizer

2.By passing it through filter

3.By amplifying it

## Question: ```In digital image coding which image must be smaller in size? ```

1.Input image

2.Output image

3.Input & Output image

4.None of the mentioned

## Question: ```In symmetric key cryptosystem, who knows the key? ```

1.Sender

4.None of the mentioned

1.4 bits

2.8 bits

3.9 bits

4.16 bits

1.Interrelating

2.Estimating

3.Integrating

4.Combining

## Question: ```Interpolation is done by ```

1.Curve fitting

2.Regression analysis

3.Curve fitting & Regression analysis

4.None of the mentioned

## Question: ```Interpolation means ```

2.Only aligning old data points

3.Only removing old data points

4.None of the mentioned

## Question: ```Interpolation methods are ```

1.Linear interpolation

2.Piecewise constant interpolation

3.Polynomial interpolation

4.All of the mentioned

## Question: ```Interpolation provides a mean for estimating functions ```

1.At the beginning points

2.At the ending points

3.At the intermediate points

4.None of the mentioned

## Question: ```Lempel-Ziv algorithm is ```

1.Variable to fixed length algorithm

2.Fixed to variable length algorithm

3.Fixed to fixed length algorithm

4.Variable to variable length algorithm

## Question: ```Linear interpolation is ```

1.Easy

2. Precise

3.Easy & Precise

4.None of the mentioned

## Question: ```Mutual information should be ```

1.Positive

2.Negative

3.Positive & Negative

4.None of the mentioned

## Question: ```Self information should be ```

1.Positive

2.Negative

3.Positive & Negative

4.None of the mentioned

1.True

2.False

1.Binary coding

2.Source coding

3.Bit coding

4.Cipher coding

## Question: ```The self information of random variable is ```

1.0

2.1

3.Infinite

4.Cannot be determined

## Question: ```The unit of average mutual information is ```

1.Bits

2.Bytes

3.Bits per symbol

4.Bytes per symbol

## Question: ```When probability of error during transmission is 0.5, it indicates that ```

1.Channel is very noisy

3.Channel is very noisy & No information is received

4.None of the mentioned

## Question: ```When the base of the logarithm is 2, then the unit of measure of information is ```

1.Bits

2.Bytes

3.Nats

4.None of the mentioned

## Question: ```When X and Y are statistically independent, then I (x,y) is ```

1.1

2.0

3.Ln 2

4.Cannot be determined

## Question: ```Which achieves greater compression? ```

1.Lossless coding

2.Lossy coding

3.Lossless & Lossy coding

4.None of the mentioned

## Question: ```Which are forward error correcting codes? ```

1.Block codes

2.Convolutional codes

3.Block & Convolutional codes

4.None of the mentioned

## Question: ```Which can detect two bit errors? ```

1.Parity check

2.Cyclic redundancy check

3.Parity & Cyclic redundancy check

4.None of the mentioned

## Question: ```Which coding method uses entropy coding? ```

1.Lossless coding

2.Lossy coding

3. Lossless & Lossy coding

4.None of the mentioned

## Question: ```Which gets less affected by noise? ```

1.Error correction

2.Error detection

3.Error correction & detection

4.None of the mentioned

## Question: ```Which has better minimum distance? ```

1.Check sum

2.Cyclic redundancy check

3.Check sum & Cyclic redundancy check

4.None of the mentioned

## Question: ```Which has comparatively high frequency component? ```

1.Sine wave

2.Cosine wave

3. Square wave

4.None of the mentioned

## Question: ```Which has continuous transmission? ```

1.Asynchronous

2.Synchronous

3. Asynchronous & Synchronous

4.None of the mentioned

## Question: ```Which is more complex? ```

1.Encoding

2.Decoding

3.Encoding & Decoding

4.None of the mentioned

## Question: ```Which is more efficient method? ```

1.Encoding each symbol of a block

2.Encoding block of symbols

3.Encoding each symbol of a block & Encoding block of symbols

4.None of the mentioned

## Question: ```Which is more expensive? ```

1.Polynomial interpolation

2.Linear interpolation

3.Polynomial & Linear interpolation

4.None of the mentioned

## Question: ```Which is used to protect privacy of the information? ```

1.Compression coding

2.Source coding

3.Cipher coding

4.None of the mentioned

## Question: ```Which needs more check bits? ```

1.Error correction

2.Error detection

3.Error correction & detection

4. None of the mentioned

## Question: ```Which needs re-sending of signal? ```

1.Error correction

2.Error detection

3.Error correction & detection

4.None of the mentioned

## Question: ```Which operates on continuous stream of data? ```

1.Block codes

2. Convolutional codes

3.Block & Convolutional codes

4.None of the mentioned

## Question: ```Which produces smoother interpolants? ```

1.Polynomial interpolation

2.Spline interpolation

3.Polynomial & Spline interpolation

4.None of the mentioned

## Question: ```Which reduces the size of the data? ```

1.Source coding

2.Channel coding

3.Source & Channel coding

4.None of the mentioned

## Question: ```Which requires bit transitions? ```

1.Asynchronous

2.Synchronous

3.Asynchronous & Synchronous

4.None of the mentioned

## Question: ```While recovering signal, which gets attenuated more? ```

1.Low frequency component

2.High frequency component

3.Low & High frequency component

4.None of the mentioned

## More MCQS

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