In standing wave pattern on a transmission line voltage and current nodes coinci

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Question
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)

Correct Answer

voltage nodes and current antinodes as well as current nodes and voltage antinodes coincide

Explanation

When standing wave is set up voltage maxima and current minima and voltage minima and current maxima coincide.

Communication Systems problems

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2. 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

3. 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

5. 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

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

7. 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

8. 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

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