Chapter 6 : Digital Modulation and Transmission

1	Can BPSK be considered a kind of DSB-SC signal?
	A)	Yes
	B)	No
2	Is it true that in DEPSK system error always occurs in pairs?
	A)	Yes
	B)	No
3	Does channel bandwidth requirement reduces by a factor of four in QPSK compared to BPSK?
	A)	Yes
	B)	No, by a factor of two
4	Is it true that error rate in QASK is lower than 16 MPSK but higher than QPSK?
	A)	Yes
	B)	No
5	The minimum distance in signal space for non-orthogonal BFSK cannot be more than orthogonal BFSK. Is it correct?
	A)	Yes
	B)	No
6	MSK has lower inter symbol interference compared to QPSK because the baseband signal is smoother. Is that true?
	A)	Yes
	B)	No
7	Can we say that QPSK signals are in time quadrature while MSK signals are in frequency quadrature?
	A)	Yes
	B)	No
8	Can duobinary encoding be called correlative coding?
	A)	Yes, if it is generated by considering correlation between successive intervals
	B)	No
9	Does precoding stage in duobinary signaling prevent error propagation?
	A)	Yes
	B)	No
10	Does Nyquist third criterion say that contribution from other symbols should be zero at the midpoint of a symbol?
	A)	Yes
	B)	No, the first criterion says that
11	A decision threshold in the final comparator stage of regenerative repeater helps to produce clean digital signal. Is that so?
	A)	Yes
	B)	No
12	In eye pattern noise is not related to opening or closing of eye. Is that true?
	A)	Yes
	B)	No
13	Equalizer should have a transfer function that is inverse of the channel. Is that correct?
	A)	Yes
	B)	No