Data Communication and Networks MCQ Set 5

1.          Which data communication method is used to transmit the data over a serial communication link?                            

a.       simplex

b.      half-duplex

c.       full-duplex

d.      b and c

               

               

2.          What is the minimum number of wires needed to send data over a serial communication link layer?                         

a.       1

b.      2

c.       4

d.      6

                               

               

3.          Which of the following types of channels moves data relatively slowly?                                  

a.       wide band channel

b.      voice band challen

c.       narrow band channel

d.      None of these

               

               

               

4.          Most data communications involving telegraph lines use:                              

a.       simplex lines

b.      wideband channel

c.       narrowband channel

d.      dialed service

               

5.          A communications device that combines transmissions from several I/O devices into one line is a                              

a.       concentrator

b.      modifier

c.       multiplexer

d.      full-duplex line

6.          How much power (roughly) a light emitting diode can couple into an optical fiber?                             

a.       100 microwatts

b.      440 microwatts

c.       100 picowatts

d.      10 miliwatts

               

               

7.          The synchronous modems are more costly than the asynchronous modems because                      

a.       they produce large volume of data

b.      they contain clock recovery circuits

c.       they transmit the data with stop and start bits

d.      they operate with a larger bandwidth

                               

               

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

               

               

9.          In a synchronous modem, the digital-to-analog converter transmits signal to the                                

a.       equilizer

b.      modulator

c.       demodulator

d.      terminal

               

               

10.          Which of the following communications lines is best suited to interactive processing applications?                             

a.       narrow band channel

b.      simplex lines

c.       full duplex lines

d.      mixed band channels

Answers

1.c

2.b

3.c

4.c

5.c

6.a

7.b

8.c

9.a

10.c