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Quiz No. 3 Dated: Jul 15, 14

Dear Students,


Quiz No. 3 of CS601 will be held on July 21, 2014 and will also remain open on July 22, 2014. Lecture no. 23 to 32 will be included in the quiz. You are required to attempt the quiz as early as possible once it is available to you.


Best of Luck!


Regards,

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CS601 Quiz no.3

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1. Friend functions are _____________.

unidirectional
bidirectional
like inline functions
private


2. Modem standards are

Cable Modems

Bell and ITU-U Modems

Traditional and 56K Modems

3. Unused bandwidth between channels to prevent signals from overlapping is called _____________.

Frequency

Time Period

Guard Bands

Spectrum


4. Permanent/dedicated analog connection between two subscribers is called ________________.

Switched/ 56 Service

Analog Leased Service

DDS

DS

5. Light source can either _____ or ______.

ELD, LID
LED, LID
ELD, ILD

LED, ILD

6. __________ means loss of energy.


Attenuation

Alteration

Distortion

7. __________ means that the signal changes its form or shape.

Noise

Attenuation

Alteration

Distortion


8. If a T-1 carries 8000 frames, then data rate will be ___________

2.544 Mbps

1.544 Mbps

1.544 kbps

1.544 Gbps


9. TROPOSHERE is the portion of the atmosphere extending outwards approx.______ miles from the earth.

30

40

10

100


10. Signals are transmitted from one device to another in the form of ___________.

Analog

Light

Binary

Electromagnetic energy


11. Optical signals are multiplexed using __________ at switching office to create wider BW optical signals.

WDM

FDM

TDM

MUX

TROPOSHERE is the portion of the atmosphere extending outwards approx. 30 miles from the earth

True *
False

Speed of light in a vacuum

200000 Km/sec
300000 Km/sec *
600000 Km/sec
None of Given

A traditional telephone line has a bandwidth of __________.

2000 Hz *
4000 Hz
2000 MHz
4000 MHz

Mechanical specifications of _________ define a combination of two connectors, on with 37 pins and one with 9 pins for a combined 46 pins.

EIA 854
EIA 558
EIA 302
EIA 448 *

STP can eliminate a phenomenon called Crosstalk

True *
False

A ______________ modem is used to connect two DTEs directly.

NULL *
Cable
DSL
None of the given

TROPOSHERE is the layer of atmosphere above the troposphere but below space

True
False *

Effective bandwidth of telephone line used for data transmission is 2400 Hz covering a range from 600Hz to 3000 Hz.

1500 Hz
1200 Hz
2000 Hz
2400 Hz *

Bandwidth required for the ASK is equal to the __________ of the signal.

Baud rate *
Frequency
Period
Phase

Traditional telephone lines can carry frequencies btw 300 Hz and 3300 Hz giving them a bandwidth of ___________.

2000 Hz
1000 Hz
1500 Hz
3000 Hz *
T-Connector is used thick connector.

True 
false*
___________ uses a series of filters to decompose multiplexed signal into its constituent signals.

MUX
DEMUX*
DELUX
any of the given

No addressing is necessary in asynchronous TDM.

· True *
false
______ generates the data and passes it along with any control information to a ________.

DTE, DCE *
DCE, DTE
DTE, DTE
DCE, DCE

Permanent analog connection between two subscribers is called ________________.

Switched 56 Service
Analog Leased Service*
DDS
DS
MUX adds extra bits to a device in bit ______

Stuffing
Adding
Multiplication *
Exchanging
Switched analog service is leased line.

true
false*

There are ________ basic categories of multiplexing. 

  3*

 4

 2

 5

STP can eliminate a phenomenon called…… 

  Crosstalk*

 Channel

 Coaxial Cable

 Noise

 In 56K Modems Max Uploading speed is ______ bytes and downloading speed is ______ byte. 

  40K, 56K

 33.6K, 56K*

 56K, 33.6K

 56K, 36.6K

 In Synchronous TDM, Time slots are not same in number as input devices. 

  True

 False*

Inverse   and Demultiplexing are different.

  True*

 False

 A broadcast signal is received by the orbiting satellites which rebroadcasts 

  to the resender

 to the sender

 to the atmosphere 

 none of the given

 Cable that connects the subscriber telephone to the nearest end office in a local loop is called 

  Twisted-pair cable

 Coaxial cable

  Fiber-optic cable

 Subscriber cable  

Asynchronous TDM is efficient only when the size of the time slot is kept relatively...
Large    
Small
Medium
Zero
No addressing is necessary in asynchronous TDM.
False    
True
Twister pair cable consists of --- conductors.
2*    
3
4
5
In Digital Data Service, maximum data rate is
50kbps
64kbps    
33kbps
All of the above
Air is ---
DTE
DCE
Tranmission medium    
DTE & DCE
A portion of the path that carries TX b\w a given pair of devices is known as ---
Node
Bridge
Channel*    
Access Point

A portion of the path that carries TX between a given pair of devices is known as 
Terminal, microprocessor, computer, printer or any other device that generates or consumes digital data is known as ---.
DCE
DTE    
DCE & DTE
DTE & DTE
STP is more expensive than UTP and is less susceptible to noise
True*    
False

The __________ converts the signal to a format appropriate to the transmission medium and introduces it onto the network link.

    DCE *
    DTE
    DCE & DTE
    None of the given

Bit stuffing is the process in which extra bits are___________.

    Removed
    Added
    Added and Removed *
    None of the above
Data rate limitation of traditional modems is 6KHz.

    True
    False *
Time slots are dynamically allotted in _______________TDM technique.

    FDM
    Asynchronous
    WDM
    Synchronous *

WDM stands for

            Wave Division Multiplexing*
            Wrong Division Multiplexing
            Well Division Multiplexing
            West Division Multiplexing
Europeans use a version of T-lines called _________

            F-lines
            E-lines*
            D-lines
            S-lines
T-Lines are ___________ lines designed for digital data
            Analog
            Digital*
            Composite
            Telephone
Which of the following techniques takes data from one high speed line and breaks it into
portions?
            Inverse subtraction
            Inverse addition
            Multiplexing
            Inverse multiplexing
____ measures the relative strength of the two signals or a signal at two different points.
            Data rate
            Baud rate
            Frequency
            Decibel*
T-Connector is used in ______
            Thin Ethernet*
            Thick Ethernet
            Terminator
            Refraction

______________ is caused by random motion of electrons in a wire that creates extra signals
which are not originally sent by sender.
            Thermal Noise

            Induced noise

            Crosstalk
            Impulse noise
Unused bandwidth between channels to prevent signals from overlapping is called_____.
            Frequency
            Time Period
            Guard Bands*
            Spectrum

Unused bandwidth between channels to prevent signals from overlapping is called 

PSTN stands for________________ 
Public Switched Telephone Network ans
Pakistan Standard Telephone Network 
Private Switched Telephone Network 
Public Standard Telephone Network 

Fiber Technology supports ______ modes for the propagation of light. 

2 ans 

________ is the layer of atmosphere above the troposhere but below space 
INOSPHERE*
TROPOSHERE 
INOSPHERIC 
TROPOSPHERIC 

Multiplexing is the set of techniques that allows simultaneous TX of multiple signals across a

___________ data link

Single *
Double
Multi
None of the given

Fiber Optic cable is defined by the ratio of the _________ of its core to the diameter of its cladding. 
Diameter
Length 
Radius 
Density 

1:     Radio wave transmission utilizes ___________ different types of propagation.

2

3

4

5


2:       PSTN stands for________________ 
Select correct option: 

Public Switched Telephone Network                                ( ANS)
Pakistan Standard Telephone Network 
Private Switched Telephone Network 
Public Standard Telephone Network 

3:     Fiber Optic cable is defined by the ratio of the _________ of its core to the diameter of its cladding. 
Select correct option: 

Diameter                                                            (ANS)
Length 
Radius 
Density 

 

4:        In Digital Data Service, maximum data rate is

50kbps
64kbps                                                           (ANS)
33kbps
All of the above

5:       The high data rate is provided by _________ transmission medium

Fiber optic

Coxial cable

Shielded twisted pair

Un-Shielded twisted pair


6:      ________ measures the relative strength of the two signals or a signal at two different points. 
Select correct option: 

Data rate 
Baud rate 
Frequency 
Decibel                                                  (ANS)



7:      Unused bandwidth between channels to prevent signals from overlapping is called_____________.

Select correct option:

            Frequency

            Time Period

            Guard Bands                                       (ANS)

            Spectrum


8:       Time slots are dynamically allotted in _______________TDM technique.

Select correct option:

    FDM
    Asynchronous
    WDM
    Synchronous                                  (ANS)

9:      Permanent analog connection between two subscribers is called. ________________.

    Switched 56 Service
    Analog Leased Service
    DDS                                           (ANS)
    DS

10:     Cable that connects the subscriber telephone to the nearest end office in a local loop is called 

  Twisted-pair cable                    (ANS)

 Coaxial cable

  Fiber-optic cable

 Subscriber cable


 

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