laboursonline – MCQs, Mock Tests | Electrical measurements Digital Communications MCQs set-17

Which has comparatively high frequency component?

1. Sine wave
2. Cosine wave
3. Square wave
4. None of the mentioned

✅ Correct Answer: 3

Which has continuous transmission?

1. Asynchronous
2. Synchronous
3. Asynchronous & Synchronous
4. None of the mentioned

✅ Correct Answer: 2

Which requires bit transitions?

1. Asynchronous
2. Synchronous
3. Asynchronous & Synchronous
4. None of the mentioned

✅ Correct Answer: 2

In synchronous transmission, receiver must stay synchronous for

1. 4 bits
2. 8 bits
3. 9 bits
4. 16 bits

✅ Correct Answer: 3

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

✅ Correct Answer: 4

Which can detect two bit errors?

1. Parity check
2. Cyclic redundancy check
3. Parity & Cyclic redundancy check
4. None of the mentioned

✅ Correct Answer: 2

CRC uses

1. Multiplication
2. Binary division
3. Multiplication & Binary division
4. None of the mentioned

✅ Correct Answer: 3

Which needs re-sending of signal?

1. Error correction
2. Error detection
3. Error correction & detection
4. None of the mentioned

✅ Correct Answer: 2

Which needs more check bits?

1. Error correction
2. Error detection
3. Error correction & detection
4. None of the mentioned

✅ Correct Answer: 1

Which gets less affected by noise?

1. Error correction
2. Error detection
3. Error correction & detection
4. None of the mentioned

✅ Correct Answer: 2

Which is used to protect privacy of the information?

1. Compression coding
2. Source coding
3. Cipher coding
4. None of the mentioned

✅ Correct Answer: 3

Digital signals are easy for

1. Storage
2. Handling
3. Time dilation
4. All of the mentioned

✅ Correct Answer: 4

Which are forward error correcting codes?

1. Block codes
2. Convolutional codes
3. Block & Convolutional codes
4. None of the mentioned

✅ Correct Answer: 3

Which operates on continuous stream of data?

1. Block codes
2. Convolutional codes
3. Block & Convolutional codes
4. None of the mentioned

✅ Correct Answer: 2

Which is more complex?

1. Encoding
2. Decoding
3. Encoding & Decoding
4. None of the mentioned

✅ Correct Answer: 2

Which has better minimum distance?

1. Check sum
2. Cyclic redundancy check
3. Check sum & Cyclic redundancy check
4. None of the mentioned

✅ Correct Answer: 2

In symmetric key cryptosystem, who knows the key?

1. Sender
2. Receiver
3. Sender & Receiver
4. None of the mentioned

✅ Correct Answer: 3

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

✅ Correct Answer: 2

Mutual information should be

1. Positive
2. Negative
3. Positive & Negative
4. None of the mentioned

✅ Correct Answer: 3

ASCII code is a

1. Fixed length code
2. Variable length code
3. Fixed & Variable length code
4. None of the mentioned

✅ Correct Answer: 1

Which reduces the size of the data?

1. Source coding
2. Channel coding
3. Source & Channel coding
4. None of the mentioned

✅ Correct Answer: 1

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

✅ Correct Answer: 2

Which coding method uses entropy coding?

1. Lossless coding
2. Lossy coding
3. Lossless & Lossy coding
4. None of the mentioned

✅ Correct Answer: 2

Which achieves greater compression?

1. Lossless coding
2. Lossy coding
3. Lossless & Lossy coding
4. None of the mentioned

✅ Correct Answer: 2

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

✅ Correct Answer: 2

Which are uniquely decodable codes?

1. Fixed length codes
2. Variable length codes
3. Fixed & Variable length codes
4. None of the mentioned

✅ Correct Answer: 1

A rate distortion function is a

1. Concave function
2. Convex function
3. Increasing function
4. None of the mentioned

✅ Correct Answer: 2

Interpolation is done by

1. Curve fitting
2. Regression analysis
3. Curve fitting & Regression analysis
4. None of the mentioned

✅ Correct Answer: 3

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

✅ Correct Answer: 3

Interpolation methods are

1. Linear interpolation
2. Piecewise constant interpolation
3. Polynomial interpolation
4. All of the mentioned

✅ Correct Answer: 4

Linear interpolation is

1. Easy
2. Precise
3. Easy & Precise
4. None of the mentioned

✅ Correct Answer: 1

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

✅ Correct Answer: 2

Which produces smoother interpolants?

1. Polynomial interpolation
2. Spline interpolation
3. Polynomial & Spline interpolation
4. None of the mentioned

✅ Correct Answer: 3

Which is more expensive?

1. Polynomial interpolation
2. Linear interpolation
3. Polynomial & Linear interpolation
4. None of the mentioned

✅ Correct Answer: 1

Gaussian process is a _____ interpolation process.

1. Linear
2. Non linear
3. Not an interpolation process
4. None of the mentioned

✅ Correct Answer: 1

Interpolation means

1. Adding new data points
2. Only aligning old data points
3. Only removing old data points
4. None of the mentioned

✅ Correct Answer: 1

Interpolation is a method of

1. Interrelating
2. Estimating
3. Integrating
4. Combining

✅ Correct Answer: 2

Self information should be

1. Positive
2. Negative
3. Positive & Negative
4. None of the mentioned

✅ Correct Answer: 1

The unit of average mutual information is

1. Bits
2. Bytes
3. Bits per symbol
4. Bytes per symbol

✅ Correct Answer: 1

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

✅ Correct Answer: 3

Binary Huffman coding is a

1. Prefix condition code
2. Suffix condition code
3. Prefix & Suffix condition code
4. None of the mentioned

✅ Correct Answer: 1

The event with minimum probability has least number of bits.

1. True
2. False
3.
4.

✅ Correct Answer: 2

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

✅ Correct Answer: 2

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

✅ Correct Answer: 1

When X and Y are statistically independent, then I (x,y) is

1. 1
2. 0
3. Ln 2
4. Cannot be determined

✅ Correct Answer: 2

The self information of random variable is

1. 0
2. 1
3. Infinite
4. Cannot be determined

✅ Correct Answer: 3

Entropy of a random variable is

1. 0
2. 1
3. Infinite
4. Cannot be determined

✅ Correct Answer: 3

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

✅ Correct Answer: 2

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

✅ Correct Answer: 1

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

1. True
2. False
3.
4.

✅ Correct Answer: 1