On This Page
This set of Digital Communication Multiple Choice Questions & Answers (MCQs) focuses on Digital Communication Set 4
Q1 | The bandwidth of BFSK is ______________ than BPSK.
- lower
- same
- higher
- not predictable
Q2 | In Binary FSK, mark and space respectively represent
- 1 and 0
- 0 and 1
- 11 and 00
- 00 and 11
Q3 | The frequency shifts in the BFSK usually lies in the range
- 50 to 1000 hz
- 100 to 2000 hz
- 200 to 500 hz
- 500 to 10 hz
Q4 | The spectrum of BFSK may be viewed as the sum of
- two ask spectra
- two psk spectra
- two fsk spectra
- none of the above
Q5 | The maximum bandwidth is occupied by
- ask
- bpsk
- fsk
- none of the above
Q6 | QPSK is a modulation scheme where each symbol consists of
- 4 bits
- 2 bits
- 1 bits
- m number of bits, depending upon the requireme
Q7 | The data rate of QPSK is ___________ of BPSK.
- thrice
- four times
- twice
- same
Q8 | QPSK system uses a phase shift of
- Π
- Π/2
- Π/4
- 2Π
Q9 | Minimum shift keying is similar to
- continuous phase frequency shift keying
- binary phase shift keying
- binary frequency shift keying
- qpsk
Q10 | In MSK, the difference between the higher and lower frequency is
- same as the bit rate
- half of the bit rate
- twice of the bit rate
- four time the bit rate
Q11 | The technique that may be used to reduce the side band power is
- msk
- bpsk
- gaussian minimum shift keying
- bfsk
Q12 | Analog to digital conversion includes
- sampling
- quantization
- sampling & quantization
- none of above
Q13 | The process of converting the analog sample into discrete form is called
- modulation
- multiplexing
- quantization
- sampling
Q14 | The modulation techniques used to convert analog signal into digital signal are
- adm
- pcm
- dm
- all of above
Q15 | In Delta modulation,
- one bit per sample is transmitted
- all the coded bits used for sampling are transmitted
- the step size is fixed
- both a and c are correct
Q16 | In digital transmission, the modulation technique that requires minimum bandwidth is
- delta modulation
- pcm
- dpcm
- pam
Q17 | In Delta Modulation, the bit rate is
- n times the sampling frequency
- n times the modulating frequency
- n times the nyquist criteria
- none of the above
Q18 | In Differential Pulse Code Modulation techniques, the decoding is performed by
- accumulator
- sampler
- pll
- quantizer
Q19 | The crest factor of a waveform is given as –
- 2 x peak value/ rms value
- rms value / peak value
- peak value/ rms value
- peak value/ 2rms value
Q20 | The digital modulation technique in which the step size is varied according to the variation in the slope of the input is called
- delta modulation
- pcm
- adaptive delta modulation
- pam
Q21 | Impulse sampling is also called as
- delta sampling
- ideal sampling
- natural sampling
- both a & b
Q22 | Nyquist Rate is given by
- 2w
- 2fmin
Q23 | The number of voice channels that can be accommodated for transmission in T1 carrier system is
- 24
- 32
- 56
- 64
Q24 | For a line code, the transmission bandwidth must be
- maximum possible
- as small as possible
- depends on the signal
- none of the above
Q25 | Scrambling of data is
- removing long strings of 1’s and 0’s
- exchanging of data
- transmission of digital data
- all of the above