76. In the equation of M-ary PSK signal (where Ey is symbol energy), M becomes large. Then d will approach
77. The trapezoidal pattern of figure is obtained when examining an AM wave by an oscilloscope. Modulation factor of the wave is
78. Y signal has maximum percentage of
79. To ensure good transient response in audio systems the natural frequencies should be
80. If k is dielectric constant of a medium, the velocity factor in that medium is
81. An AM signal and a narrowband FM signal with identical carriers, modulating signals and modulation index of 0.1 are added together. The resultant signal can be closely approximated by
82. The equation v(t) = A cos [ωct + φ(t)] where A and ωc are constant and φ(t) is a function of base signal represents Phase modulationAmplitude modulationAngle modulationFrequency modulation Which of the above are true?
83. An FM signal with deviation δ is passed through mixer. Its frequency is reduced five fold. The deviation in output of mixer is
84. The total number of channels allotted for cellular telephone is
85. The F.T. of {e-1 ∪(t)} is equal to . Therefore
is
86. Sound waves are electromagnetic waves.
87. In major diatonic musical scale, an octave is divided into
88. The bandwidth of DSB suppressed carrier modulation system when the modulating frequency varies between 500 Hz and 5 kHz is
89. The filter circuit for feeding a wooffer has
90. The Hilbert transform of cos ω1t + sin ω2t is
91. In ionosphere incidence angle is 60°. The maximum usable frequency fm is equal to
92. The generally used value of EHV supply in TV receivers is
93. The number of channels available in MF band (300 kHz - 3 MHz) for AM modulating signal of 20 kHz is
94. The function of blend control in stereo system is
95. The output resistance of a microphone is 20 ohms. It is to feed a line of impedance 320 ohms. To ensure maximum power transfer, the turn ratio of transformer is
96. In a reactance FET, gm = 9 x 10-3 Siemens, gate to source resistance is one-ninth of reactance of gate to drain capacitor and frequency is 4 MHz. The capacitive-reactance is
97. Audio cassettes used in household tape recorders have a width of
98. The receiver of a pulsed RADAR can detect signal power in the order of
99. In a 100% amplitude modulated signal, the power in the upper sideband when carrier power is to be 100 W and modulation system SSBSC, is