MCQ in Digital and Data Communication Networks Part 9 | ECE Board

This is the Multiple Choice Questions Part 9 of the Series in Digital and Data Communication Networks as one of the Communications Engineering topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Examination Questions in Electronic System and Technologies, Communications Books, Journals and other Communications References.

MCQ Topic Outline included in ECE Board Exam Syllabi

• MCQ in Bit and and Binary Transmission
• MCQ in Signaling Rate
• MCQ in Error Probability, Digital Filtering, Switching, Packet Circuit, Vertical Circuit
• MCQ in Open systems Interconnection
• MCQ in Multiplying, Modulation and Synchronization
• MCQ in Pulse Code Modulation, Companding, Encoding, Bandwidth and Signal to Noise Ratio
• MCQ in Delta Modulation, Slope Overload, Adaptive Delta Modulation, Codes and Protocol
• MCQ in Error Detection and Correction, Digital Carrier systems
• MCQ in Frequency Shift Keying, Phase Shift Keying, Differential Phase Shift keying
• MCQ in DC nature of data transmission, loops, Neutral and Polar
• MCQ in Binary transmission and the concept of time
• MCQ in Asynchronous and Synchronous, timing, Distortion, Bits, band, WPM
• MCQ in Data Interface standards, Data input/output devices
• MCQ in Digital Transmission on analog channel, Modulation-demodulation schemes parameters
• MCQ in Circuit conditioning, Modem Applications
• MCQ in Serial and Parallel Transmission

Continue Practice Exam Test Questions Part 9 of the Series

⇐ MCQ in Digital and Data Communication Networks Part 8 | ECE Board

Choose the letter of the best answer in each questions.

401. 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

402. For a noise to be white Gaussian noise, the optimum filter is known as

A. low pass filter

B. base band filter

C. matched filter

D. bessel filter

403. Matched filters are used

A. for maximizing signal to noise ratio

B. for signal detection

C. in radar

D. all of the above

404. The number of bits of data transmitted per second is called

A. data signaling rate

B. modulation rate

C. coding

D. none of the above

405. Pulse shaping is done

A. to control inter symbol interference

B. by limiting the bandwidth of transmission

C. after line coding and modulation of signal

D. all of the above

406. The criterion used for pulse shaping to avoid ISI is

A. nyquist criterion

B. quantization

C. sample and hold

D. pll

407. The filter used for pulse shaping is

A. raised – cosine filter

B. sinc shaped filter

C. gaussian filter

D. all of the above

408. Roll – off factor is defined as

A. the bandwidth occupied beyond the nyquist bandwidth of the filter

B. the performance of the filter or device

C. aliasing effect

D. none of the above

409. Nyquist criterion helps in

A. transmitting the signal without isi

B. reduction in transmission bandwidth

C. increase in transmission bandwidth

D. both a and b

410. The Nyquist theorem is

A. relates the conditions in time domain and frequency domain

B. helps in quantization

C. limits the bandwidth requirement

D. both a and c

411. The difficulty in achieving the Nyquist criterion for system design is

A. there are abrupt transitions obtained at edges of the bands

B. bandwidth criterion is not easily achieved

C. filters are not available

D. none of the above

412. Equalization in digital communication

A. reduces inter symbol interference

B. removes distortion caused due to channel

C. is done using linear filters

D. all of the above

413. Zero forced equalizers are used for

A. reducing isi to zero

B. sampling

C. quantization

D. none of the above

414. The transmission bandwidth of the raised cosine spectrum is given by

A. bt = 2w(1 + α)

B. bt = w(1 + α)

C. bt = 2w(1 + 2α)

D. bt = 2w(2 + α)

415. The preferred orthogonalization process for its numerical stability is

A. gram- schmidt process

B. house holder transformation

C. optimization

D. all of the above

416. For two vectors to be orthonormal, the vectors are also said to be orthogonal. The reverse of the same

A. is true

B. is not true

C. is not predictable

D. none of the above

417. Orthonormal set is a set of all vectors that are

A. mutually orthonormal and are of unit length

B. mutually orthonormal and of null length

C. both a & b

D. none of the above

418. In On-Off keying, the carrier signal is transmitted with signal value ‘1’ and ‘0’ indicates

A. no carrier

B. half the carrier amplitude

C. amplitude of modulating signal

D. none of the above

419. ASK modulated signal has the bandwidth

A. same as the bandwidth of baseband signal

B. half the bandwidth of baseband signal

C. double the bandwidth of baseband signal

D. none of the above

420. Coherent detection of binary ASK signal requires

A. phase synchronization

B. timing synchronization

C. amplitude synchronization

D. both a and b

421. The probability of error of DPSK is _________ than that of BPSK.

A. higher

B. lower

C. same

D. not predictable

422. In Binary Phase Shift Keying system, the binary symbols 1 and 0 are represented by carrier with phase shift of

A. Π/2

B. Π

C. 2Π

D. None of these

423. BPSK system modulates at the rate of

A. 1 bit/ symbol

B. 2 bit/ symbol

C. 4 bit/ symbol

D. none of the above

424. The BPSK signal has +V volts and -V volts respectively to represent

A. 1 and 0 logic levels

B. 11 and 00 logic levels

C. 10 and 01 logic levels

D. 00 and 11 logic levels

425. The binary waveform used to generate BPSK signal is encoded in

A. bipolar nrz format

B. manchester coding

C. differential coding

D. none of the above

426. The bandwidth of BFSK is _________ than BPSK.

A. lower

B. same

C. higher

D. not predictable

427. In Binary FSK, mark and space respectively represent

A. 1 and 0

B. 0 and 1

C. 11 and 00

D. 00 and 11

428. The frequency shifts in the BFSK usually lies in the range

A. 50 to 1000 Hz

B. 100 to 2000 Hz

C. 200 to 500 Hz

D. 500 to 10 Hz

429. The spectrum of BFSK may be viewed as the sum of

A. two ask spectra

B. two psk spectra

C. two fsk spectra

D. none of the above

430. The maximum bandwidth is occupied by

A. ask

B. bpsk

C. fsk

D. none of the above

431. QPSK is a modulation scheme where each symbol consists of

A. 4 bits

B. 2 bits

C. 1 bits

D. m number of bits, depending upon the requirements

432. The data rate of QPSK is _______ of BPSK.

A. thrice

B. four times

C. twice

D. same

433. QPSK system uses a phase shift of

A. Π

B. Π/2

C. Π/4

D. 2Π

434. Minimum shift keying is similar to

A. continuous phase frequency shift keying

B. binary phase shift keying

C. binary frequency shift keying

D. qpsk

435. In MSK, the difference between the higher and lower frequency is

A. same as the bit rate

B. half of the bit rate

C. twice of the bit rate

D. four time the bit rate

436. The technique that may be used to reduce the side band power is

A. msk

B. bpsk

C. gaussian minimum shift keying

D. bfsk

437. Analog to digital conversion includes

A. sampling

B. quantization

C. sampling & quantization

D. none of above

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

A. modulation

B. multiplexing

C. quantization

D. sampling

439. The modulation techniques used to convert analog signal into digital signal are

A. adm

B. pcm

C. dm

D. all of these

440. In Delta modulation,

A. one bit per sample is transmitted

B. all the coded bits used for sampling are transmitted

C. the step size is fixed

D. both a and c are correct

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

A. delta modulation

B. pcm

C. dpcm

D. pam

442. In Delta Modulation, the bit rate is

A. n times the sampling frequency

B. n times the modulating frequency

C. n times the nyquist criteria

D. none of the above

443. In Differential Pulse Code Modulation techniques, the decoding is performed by

A. accumulator

B. sampler

C. pll

D. quantizer

444. The crest factor of a waveform is given as –

A. 2 x peak value/ rms value

B. rms value / peak value

C. peak value/ rms value

D. peak value/ 2rms value

445. The digital modulation technique in which the step size is varied according to the variation in the slope of the input is called

A. delta modulation

B. pcm

C. adaptive delta modulation

D. pam

446. Impulse sampling is also called as

A. delta sampling

B. ideal sampling

C. natural sampling

D. both a & b

447. Nyquist Rate is given by

A. 2BW

B. 2fmin

C. 1/2BW

D. None of these

448. The number of voice channels that can be accommodated for transmission in T1 carrier system is

A. 24

B. 32

C. 56

D. 64

449. 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

450. 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

Questions and Answers in Digital and Data Communication Networks Series

Following is the list of multiple choice questions in this brand new series:

Complete List of MCQ in Communications Engineering per topic