Direct and reflected sound waves may interfere with each other. True False PAS u

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Question
Direct and reflected sound waves may interfere with each other.
Options
A. True
B. False

Correct Answer

False

Explanation

PAS use moving coil microphones.

Communication Systems problems

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1. 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

2. 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

4. 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

5. 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

6. 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)

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

8. 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

9. 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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