This set of Analog Communication Multiple Choice Questions & Answers (MCQs) focuses on “PWM”.

1. VFO stands for ________
a) Voltage Feedback Oscillator
b) Variable Feedback Oscillator
c) Voltage Frequency Oscillator
d) Variable Frequency Oscillator

2. What is used in Hartley oscillator?
a) a piezoelectric crystal
b) two resistor divider
c) a two-capacitor divider
d) a tapped inductor

3. What is the full form of SONET?
a) Synchronous Optical Network
b) Standard Optical Network
c) Secret Optical Network
d) Service Optical Network

4. The conditions for sinusoidal oscillation from an amplifier are called _________
a) Loop-gain criteria
b) Hartley criteria
c) Biasing criteria
d) Barkhausen criteria

5. The power density of a flicker noise is _________
a) low at high frequencies
b) greater at low frequencies
c) greater at high frequencies
d) low at low frequencies

6. What is the full form of DWDM?
a) Dense Wavelength Division Multiplexing
b) Dense Wavelength Division Modulation
c) Directed Wavelength Division Multiplexing
d) Directed Wavelength Division Modulation

7. Which parts of a sinusoidal carrier can be modulated?
a) only amplitude
b) only frequency
c) its amplitude, frequency and direction
d) its amplitude, frequency and phase angle

8. Power above the minimum required by an optical receiver is called ________
a) phase margin
b) system margin
c) excess gain
d) gain margin

9. FTTC stands for ________
a) Fiber To The Curb
b) Fiber Telephone Transmission Cable
c) Fiber Transmission Timing Cable
d) Fiber Telephone Timing Cable

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