Electronic Devices Circuits Amplitude Modulation Online Exam Quiz
Electronic Devices Circuits Amplitude Modulation GK Quiz. Question and Answers related to Electronic Devices Circuits Amplitude Modulation. MCQ (Multiple Choice Questions with answers about Electronic Devices Circuits Amplitude Modulation
The aerial current of an AM transmitter is 18 A when unmodulated but increases to 20 A when modulated.The modulation index is
Options
A : 0.68
B : 0.73
C : 0.89
D : 0.95
A carrier is simultaneously modulated by two sine waves with modulation indices of 0.4 and 0.3. The resultant modulation index will be
Options
A : 1.0
B : 0.7
C : 0.5
D : 0.35
In a DSB-SC system with 100% modulation, the power saving is
Options
A : 100%
B : 55%
C : 75%
D : 100%
A 10 kW carrier is sinusoidally modulated by two carriers corresponding to a modulation index of 30% and 40% respectively. The total radiated power is
Options
A : 11.25 kW
B : 12.5 kW
C : 15 kW
D : 17 kW
An AM broadcast station operates at its maximum allowed total output of 50 kW with 80% modulation. The power in the intelligence part is
Options
A : 12.12 kW
B : 31.12 kW
C : 6.42 kW
D : none of the mentioned
A 2 MHz carrier is amplitude modulated by a 500 Hz modulating signal to a depth of 70%. If the unmodulated carrier power is 2 kW, the power of the modulated signal is
Options
A : 2.23 kW
B : 2.36 Kw
C : 1.18 kW
D : 1.26 kW
The modulation index is
Options
A : 20
B : 4
C : 0.2
D : 10
Total signal power is
Options
A : 208 W
B : 204 W
C : 408 W
D : 416 W
Total sideband power is
Options
A : 4 W
B : 8 W
C : 16 W
D : 2 W
A modulating signal is amplified by a 80% efficiency amplifier before being combined with a 20 kW carrier to generate an AM signal. The required DC input power to the amplifier, for the system to operate at 100% modulation, would be
Options
A : 5 kW
B : 8.46 kW
C : 12.5 kW
D : 6.25 kW
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