JOIN ADRE 2.0 Telegram Group

Digital Modulation Techniques Quiz | Digital Modulation Techniques Short Questions and Answers

Questions
41 The information rate R for given average information H= 2.0 for analog signal band limited to B Hz is
A 16 B bits/sec
B 2 B bits/sec
C 4 B bits/sec
D 8 B bits/sec

Answer: 4 B bits/sec
42 Code rate r, k information bits and n as total bits, is defined as
A r = k/n
B k = n/r
C r = k * n
D n = r * k

Answer: r = k/n
Advertisement
Article and Schedule Quiz Start Test!

DOWNLOAD CURRENT AFFAIRS PDF FROM APP

43 The technique that may be used to increase average information per bit is
A Shannon-Fano algorithm
B ASK
C FSK
D Digital modulation techniques

Answer: Shannon-Fano algorithm
44 For a binary symmetric channel, the random bits are given as
A Logic 1 given by probability P and logic 0 by (1-P)
B Logic 1 given by probability 1-P and logic 0 by P
C Logic 1 given by probability P2 and logic 0 by 1-P
D Logic 1 given by probability P and logic 0 by (1-P)2

Answer: Logic 1 given by probability P and logic 0 by (1-P)
45 The channel capacity according to Shannon’s equation is
A Information transmitted
B Defined for optimum system
C Maximum error free communication
D All of the above

Answer: All of the above
46 In DPSK technique, the technique used to encode bits is
A AMI
B Differential code
C Uni polar RZ format
D Manchester format

Answer: Differential code
47 Alternate Mark Inversion (AMI) is also known as
A Pseudo ternary coding
B Manchester coding
C Polar NRZ format
D None of the above

Answer: Pseudo ternary coding
48 The advantage of using Manchester format of coding is
A Power saving
B Polarity sense at the receiver
C Noise immunity
D None of the above

Answer: Power saving
49 The maximum synchronizing capability in coding techniques is present in
A Polar RZ
B Polar NRZ
C Manchester format
D None of the above

Answer: Manchester format
50 The format in which the positive half interval pulse is followed by a negative half interval pulse for transmission of ‘1’ is
A Polar NRZ format
B Bipolar NRZ format
C Manchester format
D None of the above

Answer: Manchester format
51 The polarities in NRZ format use
A Complete pulse duration
B Half duration
C Both positive as well as negative value
D Each pulse is used for twice the duration

Answer: Complete pulse duration
52 Impulse noise is caused due to
A Power line load switching
B Lightening strikes
C Switching transients
D All of the above

Answer: All of the above
53 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 Both a & b
D None of the above

Answer: 1 is transmitted by a positive pulse and 0 is transmitted by negative pulse
54 In a uni-polar RZ format,
A The waveform has zero value for symbol ‘0’
B The waveform has A volts for symbol ‘1’
C The waveform has positive and negative values for ‘1’ and ‘0’ symbol respectively
D Both a and b are correct

Answer: Both a and b are correct
55 Scrambling of data is
A Removing long strings of 1’s and 0’s
B Exchanging of data
C Transmission of digital data
D All of the above

Answer: Removing long strings of 1’s and 0’s
56 Regenerative repeaters are used for
A Transmission over long distances
B Reconstruction of signals
C Eliminating noise
D All of the above

Answer: All of the above
57 For a line code, the transmission bandwidth must be
A Maximum possible
B As small as possible
C Depends on the signal
D None of the above

Answer: As small as possible
58 The process of coding multiplexer output into electrical pulses or waveforms for transmission is called
A Line coding
B Amplitude modulation
C FSK
D Filtering

Answer: Line coding
59 Matched filters may be used
A To estimate the distance of the object
B In parameter estimation problems
C To estimate the frequency of the received signal
D All of the above

Answer: All of the above
60 Characteristics of Matched filter are
A They are used for signal detection
B It gives the output as signal energy in the absence of noise
C Matched filter is used to maximize Signal to noise ratio even for non Gaussian noise
D All of the above

Answer: All of the above

ADRE 2.0 FULL LENGTH MOCK TEST

Take Mock Tests

Missiles Mock Test Start Test!
SSC MTS Mock Test Start Test
IBPS CLERK MOCK TEST Start Test
SSC MTS 2022 JULY 26 Shift 1 (ENGLISH) Start Test!
SSC GD Previous Year Paper 2021 Nov 17 Shift - I (Hindi) Start Test!
SSC CGL Tier - 1 PYP 2022 April 21 Shift- 1 (ENGLISH) Start Test!
MPSC PAPER I MOCK TEST 1 (ENGLISH) Start Test!
IB Security Assistant Mock test 1 (english) Start Test!
UP POLICE CONSTABLE MOCK TEST 1 Start Test!
DELHI POLICE CONSTABLE MOCK TEST 1 (HINDI) Start Test!
Advertisement
Assam Direct Recruitment Test Series