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

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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

Question: 
Coded system are inherently capable of better transmission efficiency than the uncoded system.

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

4.By adding redundancy bits

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

2.Receiver

3.Sender & Receiver

4.None of the mentioned

Question: 
In synchronous transmission, receiver must stay synchronous for

1.4 bits

2.8 bits

3.9 bits

4.16 bits

Question: 
Interpolation is a method of

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

1.Adding new data points

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

Question: 
The event with minimum probability has least number of bits.

1.True

2.False

Question: 
The method of converting a word to stream of bits is called as

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

2.No information is received

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

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