Information Technology - National Institute of Oriented School (ITNIOS)
Set – 3
a. simplexb. half-duplexc. full-duplexd. b and
ce. None of above
Question 2:What is the minimum number of
wires needed to send data over a serial communication link layer?
a. 1b. 2c. 4d. 6e. none of above
Question 3:Which of the following types of
channels moves data relatively slowly?
a. wide band channelb. voice band challenc.
narrow band channel
Question 4:Most data communications
involving telegraph lines use:
a. simplex linesb. wideband channelc.
narrowband channeld. dialed service
Question 5:A communications device that
combines transmissions from several I/O devices into one line is a
a. concentratorb. modifierc. multiplexerd.
full-duplex line
Question 6:
How much power (roughly) a light emitting
diode can couple into an optical fiber?
a. 100 microwattsb. 440 microwattsc. 100
picowattsd. 10 miliwatts
Question 7:The synchronous modems are
more costly than the asynchronous modems because
a. they produce large volume of datab. they
contain clock recovery circuitsc. they transmit the data with stop and start
bitsd. they operate with a larger bandwidthe. none of above
Question 8:Which of the following statement is
correct?
a. terminal section of a synchronous modem contains
the scrambler
b. receiver section of a synchronous modem
contains the scrambler
c. transmission section of a synchronous modem
contains the scrambler
d. control section of a synchronous modem
contains the scrambler
e. none of the above
Question 9:In a synchronous modem, the
digital-to-analog converter transmits signal to the
a. equilizerb. modulatorc. demodulatord.
terminale. none of aobve
Question 10:
Which of the following communications lines is
best suited to interactive processing applications?
a. narrow band channelb. simplex linesc. full
duplex linesd. mixed band channels
1. c 2.
B 3. C 4. C 5. C 6. A 7.
B 8. C 9. A 10. c
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