A Best Way To Crack Gorenment Job Exams

Electronics Engineering Objective Questions { Analog Communication System }



218.  Which of the following statements is correct? In the spectrum of frequency-modulated wave
A. the total number of sidebands depends on the modulation index
B. the carrier frequency disappears when the modulation index is large
C. the carrier frequency cannot disappear
D. the amplitude of any sideband depends on the carrier modulation index
Discuss in Forum

219.  The output of transmitter is 100 kW with carrier unmodulated and 132 kW when the carrier is modulated by a sinusoidal wave, then depth of modulation is
A.16
B.32
C.64
D.80
Discuss in Forum

220.  The modulating index, for a PM signal, depends upon which of the following?
A. Only the amplitude of the modulating signal
B. Only the frequency of the modulating signal
C. Both the amplitude and frequency of the modulating signal
D. The frequency of the carrier signal amongst other things
Discuss in Forum

221.  Which of the following are suppressed by the transmitter in S.S.B.?
A. audio and one of the sideband frequencies
B. Carrier and one of the sideband frequencies
C. Carrier and audio frequency
D. None of the above
Discuss in Forum

222.  Regarding the Armstrong modulation system, which of the following statements is incoreect?
A. Frequency multiplication must be used
B. Equalisation is unnecessary
C. The system is basically phase, not frequency modulation
D. AFC is not needed
Discuss in Forum

223. In a ratio detector
A. the circuit is the same as in a discriminator except that the diode are reversed
B. the linearity is worse than in a phase discriminator
C. the output is twice that obtainable from a similar phase discriminator
D. stabilization against signal strength variations is provided
Discuss in Forum

224. A heterodyne frequencychanger is called a
A. frequency translator
B. mixer
C. modulator
D. none of the above
Discuss in Forum

Page 32 of 42

« 30 31  32  3334 »