Which of the following is the indirect way of FM generation? Reactance bipolar t

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Question
Which of the following is the indirect way of FM generation?
Options
A. Reactance bipolar transistor modulator
B. Armstrong modulator
C. Varactor diode modulator
D. Reactance FM modulator

Correct Answer

Armstrong modulator

Explanation

It generates FM through phase modulation.

Communication Systems problems

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1. For attenuation of high frequencies we should use
Options
A. shunt capacitance
B. series capacitance
C. inductance
D. resistance

2. In standing wave pattern on a transmission line
Options
A. voltage and current nodes coincide
B. voltage and current antinodes coincide
C. voltage nodes and current antinodes as well as current nodes and voltage antinodes coincide
D. both (a) and (b)

4. In FM signal with a modulation index m_f is passed through a frequency tripler. The wave in the output of the tripler will have a modulation index of
Options
A. m_f
B. 3m_f
C. m_f/3
D. m_f/9

5. It is desired that transmission line and load should match for a range of frequencies. The best method is
Options
A. to use a balun
B. to use a single stub of adjustable position
C. to use a double stub
D. to use a broad band amplifier

6. Assertion (A): Free space does not interfere with normal radiation and propagation of radio waves
Reason (R): Free space has no magnetic or gravitational fields.
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R are correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

9. Radio broadcasts are generally
Options
A. amplitude modulation
B. frequency modulation
C. both amplitude and frequency modulation
D. neither amplitude nor frequency modulation

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