1. Find the factor which is NOT accounted for by today’s modern communication sy

Question

1. Find the factor which is NOT accounted for by today’s modern communication systems.
a) Format of the information
b) Transmission speed
c) Modulation technique
d) Transmission noise and loss
2. What is the device which superimposes information onto a high-frequency signal for
transmission?
a) Demodulator
b) The carrier
c) Transmitter
d) Modulator

4. If system has a voltage gain of 25 dB, find the applied voltage if the output voltage is 5.2V.
a) 292.4 mV b) 341.9 mV c) 382.5 mV d) 452.7 mV

5. Find the advantage which is NOT associated with using the system analysis.
a) Reduced size
b) Reduced construction time and cost
c) Reduced number of port models of system
d) Sophisticated and tested design

6. Which class of switching exchange is used to interconnect the regional centers?
a) Class 1
b) Class 2
c) Class 3
d) Class 4

7. Which of the following function is NOT accounted to BORSCHT functions?
a) Battery Feed with Loop Current Limiting
b) Hybrid
c) Regulate the speech amplitude
d) Supervision/Signaling

8. What makes conductors of a transmission line behave differently at high frequencies than they do at
low frequencies?
a) At high frequencies, there are many sources of line loss.
b) At high frequencies, signal sent down a wire may be reflected back.
c) At high frequencies, there are inductive, capacitive, and resistive effects to transmission lines.
d) All of the above.

9. What is the ringing signal voltage of the telephone service?
a) 90 Vrms at 20 Hz
b) – 48 V DC
c) 90 Vrms at 50 Hz
d) 127 Vrms at 20 Hz

10. A commonly used coaxial cable, RG-8A/U, has a capacitance of 29.5 pF/ft and inductance of 73.75
nH/ft. Determine its characteristics impedance (Z0) for 1-ft section.
a) 50 b)75 c)100 d)150

Explanation / Answer

2. What is the device which superimposes information onto a high-frequency signal for
transmission?

Answer: Modulator

7. Which of the following function is NOT accounted to BORSCHT functions?

Answer:Regulate the speech amplitude

5. Find the advantage which is NOT associated with using the system analysis.?

Answer:Reduced number of port models of system

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