It is desired that transmission line and load should match for a range of freque

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Question
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

Correct Answer

to use a double stub

Explanation

When matching over a range of frequencies is desired, double stub is necessary.

Communication Systems problems

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2. A telephone exchange has 9000 subscribers. If the number of calls originating at peak time is 10, 000 in one hour, the calling rate is
Options
A. 0.9
B. 10/9
C. 0.81
D. 0.1

3. The rate at which information can be carried through a communication channel depends on
Options
A. carrier frequency
B. bandwidth
C. transmission loss
D. transmitted power

4. In a fascimile reproduction time to scan one line is 2 ms. If it has 4% blanking, the visible trace time is
Options
A. 1.92 ms
B. 2.08 ms
C. 50 ms
D. 0.08 ms

6. 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

8. 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)

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

10. 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

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