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Digital Communication

Total questions: 45

Worksheet time: 45mins

Name
Class
Date
1.

Binary Huffman coding is a

a)

Prefix condition code

b)

Suffix condition code

c)

Prefix & Suffix condition code

d)

None of the mentioned

2.

The unit of average mutual information is

a)

Bits

b)

Bytes

c)

Bits per symbol

d)

Bytes per symbol

3.

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

a)

Binary coding

b)

Source coding

c)

Bit coding

d)

Cipher coding

4.

When the base of the logarithm is 2, then the unit of measure of information is

a)

Bits

b)

Bytes

c)

Nats

d)

None of the mentioned

5.

Which is more efficient method?

a)

Encoding each symbol of a block

b)

Encoding block of symbols

c)

Encoding each symbol of a block & Encoding block of symbols

d)

None of the mentioned

6.

What are the disadvantages of digital communication?

a)

Needs more bandwidth

b)

Is more complex

c)

Needs more bandwidth & Is more complex

d)

None of the mentioned

7.

Examples of digital communication are

a)

ISDN

b)

Modems

c)

Classical telephony

d)

All of the mentioned

8.

Digital system includes

a)

Better encryption algorithm

b)

Difficult data multiplexing

c)

All of the mentioned

d)

None of the mentioned

9.

The type of encoding where no character code is the prefix of another character code is called?

a)

optimal encoding

b)

prefix encoding

c)

frequency encoding

d)

trie encoding

10.

The memory less source refers to

a)

No previous information

b)

No message storage

c)

Emitted message is independent of previous message

d)

None of the above

11.

For M equally likely messages, the average amount of information H is

a)

H = log10M

b)

H = log2M

c)

H = log10M2

d)

H = 2log10M

12.

The channel capacity is

a)

The maximum information transmitted by one symbol over the channel

b)

Information contained in a signal

c)

The amplitude of the modulated signal

d)

All of the above

13.

The capacity of a binary symmetric channel, given H(P) is binary entropy function is

a)

1 - H(P)

b)

H(P) - 1

c)

1 - H(P)2

d)

H(P)2 - 1

14.

According to Shannon Hartley theorem,

a)

The channel capacity becomes infinite with infinite bandwidth

b)

The channel capacity does not become infinite with infinite bandwidth

c)

Has a tradeoff between bandwidth and Signal to noise ratio

d)

Both b and c are correct

15.

The negative statement for Shannon's theorem states that

a)

If R > C, the error probability increases towards Unity

b)

If R < C, the error probability is very small

c)

Both a & b

d)

None of the above

16.

When probability of error during transmission is 0.5, it indicates that

a)

Channel is very noisy

b)

No information is received

c)

Channel is very noisy & No information is received

d)

None of the mentioned

17.

When the base of the logarithm is 2, then the unit of measure of information is

a)

Bits

b)

Bytes

c)

Nats

d)

None of the mentioned

18.

Modulation is done in

a)

radio receiver

b)

transmitter

c)

between transmitter and receiver

d)

None of the above

19.

In an AM wave the majority of the power is in

a)

lower sideband

b)

Carrier

c)

Upper Sideband

d)

None of the above

20.

Modulation refers to a low frequency signal controlling the

a)

amplitude of the carrier

b)

frequency of the carrier

c)

phase of the carrier

d)

any of the above

21.

Noises are variations in

a)

amplitude

b)

frequency

c)

phase

d)

both phase and frequency

22.

If level of modulation is increased ................ power is increased.

a)

carrier

b)

carrier as well as sideband

c)

sideband

d)

None of the above

23.

At 100% modulation the power in each sideband is ............ of that of carrier.

a)

50%

b)

40%

c)

60%

d)

25%

24.

The major advantage of FM over AM is

a)

reception is less noisy

b)

higher carrier frequency

c)

smaller bandwidth

d)

small frequency deviation

25.

Overmodulation results in

a)

weakening of the signal

b)

excessive carrier power

c)

distortion

d)

none of the above

26.

Which are the additional stages in FM receiver

a)

AF amplifier

b)

limiter

c)

descriminator

d)

selector

e)

None of the above

27.

The antenna length is smaller for FM broadcasting because the wavelength of FM is short

a)

True

b)

False

28.

In FM the amplitude of the wave is

a)

remains same as carrier

b)

reduces

c)

increases

d)

none of the above

29.

Select the correct order of blocks in PCM transmitter.

a)

Encoder, Quantizer, Sampler, Low pass filter.

b)

Low pass filter, Sampler, Quantizer, Encoder.

c)

Low pass filter, Quantizer, Sampler, Encoder.

d)

Low pass filter, Encoder, Sampler, Quantizer.

30.

PCM Transmitter doesn't consist this block.

a)

Low pass filter

b)

Sampler

c)

Amplifier

d)

Encoder

31.

The difference between the actual analog value and approximated discrete value due to the rounding is called __________

a)

quantization error

b)

normal error

c)

reading error

d)

sampling error

32.

Quantization noise ____________ the SNR of a signal.

a)

reduces

b)

increases

33.

The process which regenerates the PCM wave is ____

a)

Decision making

b)

Timing

c)

Decoding

d)

Equalization

34.

Identify the quantization technique.

a)

Uniform quantization

b)

Non uniform quantization

35.

Select the advantages of PCM

a)

It can increase the capacity of single telephone channels over cable pairs by multiplexing.

b)

Increases system complexity.

c)

Ruggedness to channel noise and interference.

d)

Increased bandwidth requirement.

36.

Select the advantages of Digital communication

a)

Digital cable systems are more economical.

b)

Digital signal characteristics are convenient for electronic switching.

c)

The transmission of digital signals requires circuits with a very large bandwidth.

d)

All the above.

37.

The channel capacity is

a)

The maximum information transmitted by one symbol over the channel

b)

Information contained in a signal

c)

The amplitude of the modulated signal

d)

All of the above

38.

In discrete memoryless source, the current letter produced by a source is statistically independent of _____

a)

Past output

b)

Future output

c)

Past output & Future output

d)

None of the above

39.

--------- encoding is superior to --------- encoding because of the problem of DC component alleviated

a)

Unipolar, polar

b)

polar, unipolar

c)

polar, bipolar

d)

bipolar,unipolar

40.

Which waveform type has better noise immunity?

a)

NRZ

b)

RZ

c)

Phase encoded

d)

Multilevel codes

41.

In pulse modulation, reciprocal of T(time) is

a)

Bandwidth

b)

Symbol rate

c)

Signal voltage

d)

None of the mentioned

42.

In a ______ scheme,all the signal levels are one side of the time axis, either above or below

a)

polar

b)

bipolar

c)

unipolar

d)

all the above

43.

Polar coding is a technique in which

a)

1 is transmitted by a positive pulse and 0 is transmitted by negative pulse

b)

1 is transmitted by a positive pulse and 0 is transmitted by zero volts

c)

None of the above

44.

The time interval over which the received signal may be sampled without error may be explained by

a)

Width of eye opening of eye pattern

b)

Rate of closure of eye of eye pattern

c)

Height of the eye opening of eye pattern

d)

All of the above

45.

The criterion used for pulse shaping to avoid ISI is

a)

Nyquist criterion

b)

Quantization

c)

Sample and hold

d)

PLL

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