66. The difference between a DSB and a SSB transmission is :
(a) DSB has a carrier and two side bands and SSB, a carrier and side band
(b) DSB has two side bands and SSB one side bands
(c) DSB may or may not have a carrier with two side bands and SSB either of the two side band without carrier
(d) DSB has a carrier and two side bands and SSB without carrier and two different side bands
67. The band width required for base band signals for FM radio is generally :
(a) 0.3 to 3 KHz
(b) 0.5 to 1.5 KHz
(c) upto 15 KHz
(d) upto 15 MHz
68. Probability density function of thermal noise is :
(a) Binomial
(b) Gaussian
(c) Poisson
(d) None of these
69. Which of the following is an indirect way of generating FM :
(a) Reactance FET Modulator
(b) Varactor Diode
(c) Armstrong Modulation
(d) Reactance Bipolar transistor Modulator
70. Pre-Emphasis is used to amplify :
(a) Low Frequency
(b) High Frequency
(c) Both a and b
(d) None of these
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