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DC LAB CYCLE 1 QUIZ

Total questions: 50

Worksheet time: 50mins

Name
Class
Date
1.

Analog to digital conversion includes

a)

Sampling

b)

Quantization

c)

Sampling & Quantization

d)

None of the mentioned

2.

Two binary values are represented by two different frequencies

a)

FSK

b)

ASK

c)

PSK

d)

DPSK

3.

ASK is a result of combination of shift keying and

a)

Digital Modulation

b)

Analog Modulation

c)

Amplitude Modulation

d)

Delta Modulation

4.

The qualifier Differential to PSK means that

a)

it uses phase shift of 180 degrees

b)

it uses phase shift of 0 degrees

c)

it uses phase shift of 90 degrees

d)

it uses phase shift of 270 degrees

5.

In PCM

a)

PAM samples are quantized

b)

non linear coding scheme is undertaken

c)

digital signal is converted to analog signal

6.

A signal can be recovered from its sample by using

a)

Low pass filter

b)

High pass filter

c)

Band pass filter

d)

Band stop filter

7.

The output of sampling process are called as ________

a)

Pulse code modulation

b)

Pulse amplitude modulation

8.

In PCM encoding, quantization level varies as a function of ________

a)

Frequency

b)

Amplitude

9.

In PCM the samples are dependent on _______

a)

Time

b)

Frequency

10.

Delta modulation uses _____ bits per sample.

a)

1

b)

2

c)

3

d)

4

11.

Companding is the process of

a)

Compression

b)

Expansion

c)

Compression & Expansion

12.

Which value of μ corresponds to linear amplification?

a)

μ=0

b)

μ=1

c)

μ>0

d)

μ<0

13.

Which type of quantization is most preferable for audio signals for a human ear?

a)

Uniform quantization

b)

Non uniform quantization

14.

The process of converting the analog sample into discrete form is called

a)

MODULATION

b)

MULTIPLEXING

c)

QUANTIZATION

d)

SAMPLING

15.

The sequence of operations in which PCM is done is

a)

Sampling, quantizing, encoding

b)

Quantizing, encoding, sampling

c)

Quantizing, sampling, encoding

16.

In digital transmission, the modulation technique that requires minimum bandwidth is

a)

Delta modulation

b)

PCM

c)

DPCM

d)

PAM

17.

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

18.

Noises are variations in

a)

amplitude

b)

frequency

c)

phase

d)

both phase and frequency

19.

The sequence of binary digits from the source encoder is passed to the _________

a)

transmitter

b)

channel encoder

c)

digital modulator

d)

channel decoder

20.
a)
ASK
b)
PSK
c)
FSK
d)
QAM
21.
the frequency of the analog carrier signal  is varied proportional to the digital information signal.
a)
ASK
b)
PSK
c)
FSK
d)
MSK
22.
a)
ASK
b)
PSK
c)
FSK
d)
QAM
23.
a)
ASK
b)
PSK
c)
FSK
d)
QAM
24.

What are the three different types of multiplexing?

a)

TDMA, FDMA, CDMA

b)

TDAM, FDMA, SDMA

c)

TDD, FDMA, CDMA

d)

FDD, TDD, TDMA

25.

Line coding, block coding and scrambling are conversion techniques for

a)

Analog to analog conversion

b)

Analog to digital conversion

c)

Digital to analog conversion

d)

Digital to digital conversion

26.

Which of the following are Digital-to-analog conversion techniques?

a)

AM

b)

QAM

c)

ASK

d)

PSK

e)

FSK

27.

Quadrature amplitude modulation is a combination of ____________ & ________.

a)

ASK & FSK

b)

FSK & PSK

c)

PSK & QAM

d)

ASK & PSK

28.

A signal that uses binary code (1s and 0s). It provides a constant and consistent signal.

a)

analog

b)

digital

c)

binary

d)

encrypted

29.

Digital or analogue?

a)

Digital signal

b)

Analog signal

30.

The original sender of the message, which could be a person or a machine

a)

destination

b)

source

c)

transmitter

d)

receiver

31.

An electronic device that produces radio waves - or the device that sends the message.

a)

receiver

b)

transmitter

c)

encoder

d)

digital signal

32.

Device that captures radio signals to convert signals into a usable or readable form

a)

decoder

b)

receiver

c)

transmitter

d)

communication

33.

A device, circuit, software program, or person that converts information from the source into another format to prepare for transmission.

a)

transmitter

b)

receiver

c)

decoder

d)

encoder

34.

The range of wavelengths or frequencies over which electromagnetic radiation extends. Includes radio waves, microwaves, visible light, etc.

a)

color spectrum

b)

electromagnetic spectrum

c)

transmission spectrum

d)

communication spectrum

35.
Digital Communication is
a)
any information exchanged through tablet or smartphone/iphone
b)
any information exchanged through an electronic system or internet
36.

The process of approximating the continuous set of values with a finite set of values is called _________ .

a)

Modulation

b)

Quantization

c)

Sampling

d)

Approximation

37.

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.

38.

PCM Transmitter doesn't consist this block.

a)

Low pass filter

b)

Sampler

c)

Amplifier

d)

Encoder

39.

Quantization noise ____________ the SNR of a signal.

a)

reduces

b)

increases

40.

Each quantized sample is assigned the binary code that represents the discrete amplitude value closest to the pulse's actual value. This is known as ________

a)

Quantization

b)

Sampling

c)

Encoding

d)

Decoding

41.

The process of compensating for the effects of amplitude and phase distortion produced by the channel is _______.

a)

Timing

b)

Equalization

c)

Decision making

d)

None of these

42.

The process of assigning time instants when the probability of making of a wrong decision is minimum is called _______ .

a)

error

b)

Equalization

c)

Timing

d)

sampling

43.

Select the quantization techniques..

a)

Linear quantization

b)

Uniform quantization

c)

Non-uniform quantization

d)

Non-linear quantization

44.

A (a)   quantizer uses equal length quantization intervals linearly related to analog sample values.

45.

Identify the quantization technique.

a)

Uniform quantization

b)

Non uniform quantization

46.

A digitization technique that makes use of the sample-to-sample redundancies in an analog waveform.

a)

Pulse Code Modulation

b)

Delta modulation

47.

DPCM is a process of converting an analog signal into a digital signal.

a)

True

b)

False

48.

Identify the type of modulation

a)

PAM

b)

PPM

c)

PWM

d)

PCM

49.

Sampling is a process in which _________ of continuous time signal is measured at discrete instants

a)

Frequency

b)

Amplitude

c)

Phase

d)

Wavelength

50.

Identify the modulation technique followed to obtain the above shown modulated signal

a)

ASK

b)

FSK

c)

PSK

d)

MSK