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Analog and Digital

Total questions: 62

Worksheet time: 31mins

Name
Class
Date
1.
Is music playing from a record an analog or digital signal?
a)
Analog
b)
Digital
2.
Is a video game coded as analog or digital data?
a)
Analog
b)
Digital
3.
The string of 1s and 0s that control a computer is called _____ code.
a)
binary
b)
dichotomous
c)
Morse
d)
two-number
4.
Numbers in a digital code can have _____ values.
a)
any
b)
only high
c)
only low
d)
only set
5.
Numbers in an analog code can have _____ values.
a)
any
b)
only high
c)
only low
d)
only set
6.
Which type(s) of signal(s) can be easily corrected to remove noise?
a)
Analog
b)
Digital
c)
Both
d)
Neither
7.
Analog signals can be converted to digital through a process called _____.
a)
conversion
b)
processing
c)
sampling
d)
translation
8.
How do computer hard drives and USB drives store data?
a)
Binary code
b)
Pictures
c)
Symbols
d)
Words
9.
Which type(s) of signal(s) can be transmitted as radio waves?
a)
Analog
b)
Digital
c)
Both
d)
Neither
10.
Setting the color of each pixel on a computer screen requires a _____ signal.
a)
analog
b)
digital
c)
loud
d)
fast
11.
Is music playing from a record an analog or digital signal?
a)
Analog
b)
Digital
12.
Is a video game coded as analog or digital data?
a)
Analog
b)
Digital
13.
The string of 1s and 0s that control a computer is called _____ code.
a)
binary
b)
dichotomous
c)
Morse
d)
two-number
14.
Numbers in a digital code can have _____ values.
a)
any
b)
only high
c)
only low
d)
only set
15.
Numbers in an analog code can have _____ values.
a)
any
b)
only high
c)
only low
d)
only set
16.
Which type(s) of signal(s) can be easily corrected to remove noise?
a)
Analog
b)
Digital
c)
Both
d)
Neither
17.
Analog signals can be converted to digital through a process called _____.
a)
conversion
b)
processing
c)
sampling
d)
translation
18.
How do computer hard drives and USB drives store data?
a)
Binary code
b)
Pictures
c)
Symbols
d)
Words
19.
Which type(s) of signal(s) can be transmitted as radio waves?
a)
Analog
b)
Digital
c)
Both
d)
Neither
20.
Setting the color of each pixel on a computer screen requires a _____ signal.
a)
analog
b)
digital
c)
loud
d)
fast
21.

FSK reception is

a)

Phase Coherent

b)

Phase non coherent

c)

Phase Coherent & non coherent

d)

None of the mentioned

22.

Which is called as on-off keying?

a)

Amplitude shift keying

b)

Uni-polar PAM

c)

Amplitude shift keying & Uni-polar PAM

d)

None of the mentioned

23.

QAM uses ______ as the dimensions.

a)

In phase

b)

Quadrature

c)

In phase & Quadrature

d)

None of the mentioned

24.

Which has same probability of error?

a)

BPSK and QPSK

b)

BPSK and ASK

c)

BPSK and PAM

d)

BPSK and QAM

25.

Which system uses QAM?

a)

Digital microwave relay

b)

Dial up modem

c)

Digital microwave relay & Dial up modem

d)

None of the mentioned

26.

Modulation process corresponds to ______ the amplitude, frequency or phase.

a)

Switching

b)

Keying

c)

Switching or keying

d)

None of the mentioned

27.

Matched filter

a)

Is a non linear filter

b)

Produces maximum output SNR

c)

All of the mentioned

d)

None of the mentioned

28.

Average energy per bit is given by

a)

average energy symbol/log2 M

b)

average energy symbol * log2 M

c)

log2 M/ Average energy symbol

d)

none of the mentioned

29.

In DPSK technique, the technique used to encode bits is

a)

AMI

b)

Differential code

c)

Uni polar RZ format

d)

Manchester format

30.

In binary data transmission DPSK is preferred to PSK because

a)

a coherent carrier is not required to be generated at the receiver

b)

for a given energy per bit, the probability of error is less

c)

the 1800 phase shifts of the carrier are unimportant

d)

more protection is provided against impulse noise

31.

For the signal constellation shown in the figure, the type of modulation is

a)

QPSK

b)

FSK

c)

ASK

d)

PSK

32.

A DPSK wave is obtained by

a)

BPSK

b)

Differential encoding followed by BPSK

c)

Differential Encoding

d)

None

33.

For coherent FSK modulation probability of error

a)

Pe=12erfc(Eb2No)Pe=\frac{1}{2}erfc\left(\sqrt{\frac{Eb}{2No}}\right)

b)

Pe=12erfc(12EbN0)Pe=\frac{1}{2}erfc\left(\frac{1}{2}\sqrt{\frac{Eb}{N0}}\right)

c)

Pe=12erfc(EbN0)Pe=\frac{1}{2}erfc\left(\sqrt{\frac{Eb}{N0}}\right)

d)

None

34.

QPSK uses a phase shift of

a)

π\pi

b)

π2\frac{\pi}{2}

c)

π4\frac{\pi}{4}

d)

2π2\pi

35.

The Maximum bandwidth is occupied by

a)

ASK

b)

BPSK

c)

FSK

d)

None

36.

A __________ is a piece of information that is communicated through using the senses.

a)

wave

b)

signal

c)

circuit

d)

notification

37.

This is wireless method of sending information uses radio waves

a)

analog

b)

WiFi

c)

landline

d)

GPS

38.

The use of light and cables to transfer electric signals over long distances

a)

WiFi

b)

GPS

c)

fiber optics

d)

landline

39.

To translate information into the form of code

a)

transmit

b)

encode

c)

signal

d)

encrypt

40.

The passing on, or transfer, of information

a)

transmit

b)

encode

c)

signal

d)

encrypt

41.

Change continuously over time; represented by a continuous smooth curve; can be a range of values

a)

analog signals

b)

digital signals

c)

wireless signals

d)

electric signals

42.

Is discrete and not continuous; represented by two values - either on or off

a)

analog signals

b)

digital signals

c)

wireless signals

d)

electric signals

43.

A signal to or from a computer is encoded into _________________, such as the two values - on (1) or off (0).

a)

analog signal

b)

digital signal

c)

binary numbers

d)

electricity

44.

A single unit of information in quantitative or qualitative form

a)

signal

b)

encryption

c)

data

d)

wave

45.

the unwanted modification of a signal

a)

encryption

b)

noise

c)

analog

d)

modulation

46.

a signal whose frequency is modulated

a)

FM

b)

AM

c)

PM

d)

IM

47.

a signal whose amplitude is modulated

a)

FM

b)

AM

c)

PM

d)

IM

48.

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

a)

Modulation

b)

Sampling

c)

Quantization

d)

Approximation

49.

Select the correct order of blocks in PCM Transmitter

a)

Encoder, Quantizer, Sampler, Low Pass Filter

b)

Low Pass Filter, Quantizer, Sampler, Encoder

c)

Low Pass Filter, Sampler, Quantizer, Encoder

d)

Low Pass Filer, Encoder, Sampler, Quantizer

50.

The block that is NOT present in a PCM Transmitter

a)

Low Pass Filter

b)

Sampler

c)

Encoder

d)

Amplifier

51.

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

a)

Quantization Error

b)

Sampling Error

c)

Reading Error

d)

Actual Error

52.

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)

Encoding

b)

Sampling

c)

Quantizing

d)

Decoding

53.

A _________ quantizer uses equal length quantization intervals linearly related to analog sample values.

a)

Uniform

b)

Non-Uniform

54.

A minimum sampling rate is ___ times the highest frequency component or upper bandwidth limit of the analog signal as per the sampling theorem.

a)

2

b)

4

c)

6

d)

8

55.

Identify the type of modulation

a)

PAM

b)

PPM

c)

PWM

d)

PCM

56.

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

a)

Frequency

b)

Amplitude

c)

Phase

d)

Wavelength

57.

Identify the type of Sampling

a)

Flat top sampling

b)

Instantaneous sampling

c)

Natural sampling

58.

In ____, the frequency of the analog carrier signal is varied proportional to the digital information signal.

a)

ASK

b)

FSK

c)

PSK

d)

MSK

59.

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

a)

ASK

b)

FSK

c)

PSK

d)

MSK

60.

Which of the following CANNOT be defined as a Digital to Analog conversion technique

a)

AM

b)

ASK

c)

PSK

d)

QAM

61.

In ASK, the ____ of the carrier is varied to represent two or more different signal elements

a)

Amplitude

b)

Phase

c)

Frequency

d)

All of the above

62.

___ is the process of converting analog data to digital signals

a)

Modulation

b)

Digitization

c)

Demodulation

d)

Encoding

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