Electronic Devices and Circuit Theory-Communications Questions and Answers

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Q1
An AM demodulator can be implemented with a linear multiplier followed by a ________ filter.
  • A low-pass
  • B high-pass
  • C band-pass
  • D band-stop
Answer: Option A
Q2
The intermediate frequency in a standard AM receiver is
  • A 455 Hz
  • B 455 kHz.
  • C 4.55 MHz.
  • D none of the above
Answer: Option B
Q3
Light may be propagated along a fiber-optic cable in which of the following modes?
  • A multimode step index
  • B single-mode step index
  • C multimode graded index
  • D all of the above
Answer: Option D
Q4
In AM, the carrier is changed by a modulating signal. What parameter of the carrier is changed?
  • A amplitude
  • B frequency
  • C pulse width
  • D phase
Answer: Option A
Q5
The output spectrum of a ________ modulator includes upper-side and lower-side frequencies and the carrier frequency.
  • A balanced
  • B standard amplitude
  • C none of the above
Answer: Option B
Q6
Amplitude modulation is a ________ process.
  • A multiplication
  • B division
  • C sum/difference
  • D [NIL]
Answer: Option A
Q7
What does VCO stand for?
  • A Visually-Controlled Organization
  • B Voltage-Controlled Oscillator
  • C Voltage-Centered Oscilloscope
Answer: Option B
Q8
A phase-locked loop (PLL) is a feedback circuit consisting of a
  • A phase detector.
  • B low-pass filter.
  • C VCO.
  • D all of the above
Answer: Option D
Q9
If a 1 MHz carrier is amplitude modulated with a 5 kHz audio signal, the upper-side frequency is ________ kHz.
  • A 1005
  • B 1000
  • C 995
  • D none of the above
Answer: Option A
Q10
The purpose of the balanced modulator is to remove the carrier frequency.
  • A TRUE
  • B FALSE
Answer: Option A

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