Q.11 What is the main difference between synchronous and asynchronous transmission?
(A) band width required is different.
(B) pulse height is different.
(C) clocking is derived from the data in synchronous transmission.
(D) clocking is mixed with data in asynchronous transmission.
Q.12 The transmission signal coding method for T, the carrier is called…..
(A) NRZ
(B) Bipolar
(C) Manchester
(D) Binary
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Q.13 In a synchronous modem, the digital-to-analog converter sends a signal to the……
(A) transmission line
(B) modulator
(C) terminal
(D) equalizer
Q.14 Which section of a synchronous modem contains the scrambler?
(A) Terminal section
(B) Receiver section
(C) Control section
(D) Transmission section
Q.15 The synchronous modems are more expensive than the asynchronous modems because….
(A) they must contain clock recovery circuits
(B) production volume is larger
(C) they must operate on a larger bandwidth
(D) They are larger
Q.16 The receive equalizer reduces delay distortions using a…..
(A) difference engine
(B) tapped delay lines
(C) descrambler
(D) gear shift
Q.17 How much power (approximately) a light-emitting diode can couple into an optical fiber?
(A) 1 picowatt
(B) 100 microwatts
(C) 10 milliwatts
(D) 10 watts
Q.18 Avalanche photodiode receiver can detect bits of transmitted data by receiving.
(A) 1 Photon
(B) 100 photons
(C) 10 photons
(D) 200 photons
Q.19 The loss in signal power as light travels down the fiber is called.
(A) propagation
(B) attenuation
(C) scattering
(D) absorption
Q.20 Multiple repeaters in communication satellites are called.
(A) detector
(B) modulator
(C) transponders
(D) stations
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