Coherent Detection of DSBSC Waves Online Exam Quiz
Coherent Detection of DSBSC Waves GK Quiz. Question and Answers related to Coherent Detection of DSBSC Waves. MCQ (Multiple Choice Questions with answers about Coherent Detection of DSBSC Waves
A superheterodyne receiver receives signal within frequency range of 120 to 180 MHz. Then the required Intermediate frequency is ___
Options
A : 30MHz
B : 60MHz
C : 90MHz
D : 50MHz
A wave is modulated by two sin waves having modulation indices of 0.3 and 0.5. Find the total modulation index?
Options
A : 0.1
B : 0.7
C : 0.58
D : 0.35
Approximate range of a cordless telephone is __
Options
A : 900m
B : 100m
C : 1000m
D : 475m
Carson's rule is used to calculate __
Options
A : Bandwidth of FM signal
B : SNR
C : Modulation index of FM signal
D : Figure of merit
For low level amplitude modulation, amplifier must be __
Options
A : Class C amplifier
B : Class B amplifier
C : Class D amplifier
D : class A amplifier
For signal, m(t) = 50cos(10 ? 90t + 30 sin100t), the power dissipated by the 20? resistor is __
Options
A : 100W
B : 65W
C : 74.7W
D : 62.5W
Signal and its Hilbert transform have __
Options
A : same energy density spectrum
B : same power
C : a phase difference of 60?
D : a phase difference of 120?
What is the bandwidth of a FM wave when maximum allowed deviation is 50KHz and the modulating signal has a frequency of 15KHz?
Options
A : 130 KHz
B : 260 KHz
C : 65 KHz
D : 50 KHz
What is the disadvantage of FM over AM?
Options
A : high modulating power is needed
B : requires high output power
C : large bandwidth required
D : high noise is produced
Which of the following devices is used to generate AM waves?
Options
A : Square-law modulator
B : Reactance modulator
C : Transmitter
D : Transducer
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