This set of Avionics Multiple Choice Questions & Answers (MCQs) focuses on “Radio Transmitters”.

1. What device is used to prevent power from the transmitter from going to the receiver side?
a) Multiplexer
b) Duplexer
c) Monoplexer
d) Filter

2. What generates the final carrier frequency?
a) Oscillator
b) Modulator
c) Antenna
d) Power source

3. The transmission of data by dots and dashes is an example of ___________
a) Amplitude modulation
b) Frequency modulation
c) Continuous wave transmission
d) Discrete signal transmission

4. Frequency multiplier multiplies the frequency deviation produced by the modulator.
a) True
b) False

5. What is the only oscillator capable of meeting the precision and stability demanded by the FCC?
a) Armstrong Oscillator
b) Crystal Oscillator
c) Hartley oscillator
d) RC Phase Shift Oscillator

8. What is the maximum frequency of a 16-MHz crystal with a stability of 200 ppm?
a) 1,60,03,200Hz
b) 2,14,65,400Hz
c) 1,36,12,500Hz
d) 4,56,42,863Hz

7. ______ is used to provide continuous tuning over the desired range?
a) Variable frequency oscillator
b) Frequency synthesizer
c) Variable Frequency producer
d) Frequency multiplier

8. The device that maintains controlled temperature for crystal oscillators are called __________
a) Crystal stove
b) Crystal ovens
c) Crystal chamber
d) Temperature chamber

9. Calculate the transmitter output frequency if the transmitter uses a crystal oscillator with a frequency of 14.9 MHz and a frequency multiplier chain with factors of 2, 3, and 3.
a) 1.564MHz
b) 268.2MHz
c) 264.3MHz
d) 265.6MHz

10. Calculate the frequency for maximum drift of crystal if The crystal has a stability of 6300 ppm and an output frequency of 268.2MHz and frequency multiplier chain with factors of 2, 3, and 3.
a) 123.5MHz
b) 423.2MHz
c) 269.65MHz
d) 235.1MHz

11. What is the minimum frequency of a 16-MHz crystal with a stability of 200 ppm?
a) 1,60,03,200Hz
b) 2,14,65,400Hz
c) 1,59,96,800Hz
d) 4,56,42,863Hz

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