Chapter 3 : Amplitude-Modulation Systems

1	Is it true that frequency translation help in reducing size of antenna?
	A)	Yes
	B)	No
2	Is it true that diode bridge used in switching regulator based DSB-SC generation rectifies carrier signal?
	A)	Yes
	B)	No
3	Is it true that use of simple rectifier-low pass filter based demodulator circuit a big advantage for AM?
	A)	Yes
	B)	No
4	Is it true that for envelop detector based AM system power efficiency cannot exceed 33%?
	A)	Yes
	B)	No
5	Both lower side band and upper side band carry same message information. Is it correct?
	A)	Yes
	B)	No
6	Is it true that a Hilbert transformer provides 90 degree phase shift?
	A)	Yes
	B)	No
7	Is it possible to use envelop detector for SSB demodulation?
	A)	Yes
	B)	No
8	Is it true that VSB uses more spectrum than SSB but less than DSB?
	A)	Yes
	B)	No
9	Commercial TV broadcasting uses VSB for both video and audio transmission. Is it correct?
	A)	Yes
	B)	No, only video
10	Is it true that class C amplifiers have higher power efficiency than class A amplifiers?
	A)	Yes
	B)	No
11	Baluns are a kind of transformer that is used to match balanced systems? Is that correct?
	A)	Yes
	B)	No, a balanced system with an unbalanced one
12	Antenna has a gain though it is a passive device. Is that correct?
	A)	Yes, but gain here refers to concentration of power in one direction compared to average
	B)	No
13	Is the frequency of local oscillator in superheterodyne receiver less than that of RF carrier?
	A)	Yes
	B)	No, more