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Which organization has authority over interstate and international commerce in the communications field? a. ITU-T b. IEEE c. FCC d. ISOC

They are special-interest groups that quickly test, evaluate, and standardize new technologies. a. Forums b. Regulatory agencies c. Standards organizations d. All of the above

Which agency developed standards for physical connection interfaces and electronic signaling specifications? a. EIA b. ITU-T c. ANSI d. ISO

It is a collection of many separate networks. a. A WAN b. An internet c. A LAN d. None of the above

A set of rules that govern data communications.a. timing b. syntax c. semantics d. protocol

It is an idea or concept that is a precursor to an Internet standard. a. RCF b. RFC c. ID d. none of the above

A mechanism used by hosts and gateways to send notification of datagram problems back to the sender. a. ICMP b. IGMP c. UDP d. TCP/IP

It provides support for newer applications such as voice over the Internet. a. ICMP b. IGMP c. SCTP d. TCP

A measure of how fast we can actually send data through a network.a. latency b. throughput c. propagation time d. transmission time

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A problem if different packets of data encounter different delays and the application using the data at the receiver site is time-sensitive. a. queue b. jitter c. jammer d. bummer

A digital interface standard for optical transmission.a. ETSI b. ITU c. SDH d. SONET

The adding of control information on either side of the data text of a block. a. encapsulation b. segmentation c. reassembly d. disassembly

If 5 devices are going to be connected in a mesh topology, determine the number of duplex-mode links. a. 4 b. 5 c. 10 d. 13Solution:(n (n-1))/2 = (5 (5-1))/2 = 10

A network topology wherein terminators are used. a. star b. mesh c. ring d. bus

A network topology wherein the whole network will goes down when a computers network cable is broken. a. star b. mesh c. ring d. bus

If 5 devices are going to be connected in a mesh topology, determine the number of I/O ports that must be connected to every device. a. 4 b. 5 c. 10 d. 13Solution:n-1 = 5-1 = 4

What makes optical fibers immune to EMI? a. They transmit signals in as light rather than electric current.b. They are too small for magnetic fields to introduce current in them.c. Magnetic fields cannot penetrate the glass of the fiber.d. They are readily shielded by outer conductors in cable.

For long distance communication we often make use of fibre-optic cable. Which of the following statements is correct?

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a. Fibres made from optical polymer can be used over distances of several hundred kilometers.b. Fibres made from glass can be used over distances of several hundred kilometers.c. Fibres made from glass are only suitable for short range communicationd. Fibres made from optical polymer can be used over short distances

What is the central device in star topology? a. STP server b. Hub/switch c. PDC d. Router

What OSI layer does a network cable lies?a. data link b. transport c. physical d. network

It is a joint effort of several standardization, organizations around the world targeting to produce specifications for a global 3G cellular system.a. 3GSb. 3GPPc. 3Gd. 3.5G

Which technical specification group does not belong to 3GPP working organizations?a. TSG SA Service and System Aspectsb.TSG CN Core Networkc. TSG EFA Error Function Aspectsd. TSG T Terminals

Will enhance the throughput per timeslot for both HSCSD and GPRS.a. EDGEb. EGPRSc. HSDSCd. ECSD

Are intended to carry signaling or synchronization dataa. Multiplexed channelb. Traffic channelsc. Allocation channel d. Control channel

Guard interval of OFDM.a. 80us

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b. 800 nsc. 800 KHzd. 80 KHz

The main benefit of the HSCSD feature compared to other data enhancements introduced is that it isa. the maximum data rate is limited to 64 kbpsb. up to eight times the bit rate on the single-slot full-rate traffic channelc. the maximum data rate in these early networksd. an inexpensive way to implement higher data rates

Is permanently allocated for one subscriber.a. static addressb. id addressc. home addressd. location address

Is a main component of the GPRS network, which handles the mobility management and authentication and has register function.a. SGSNb. LLCc. BSCd. SNDCP

Layer that provides services for information transfer over a physical channel between the MS and the network.a. physical linkb. data linkc. linkage linkd. physical channel

Are intended to carry either encoded speech or user data.a. Multiplexed channelb. Traffic channelsc. Allocation channel d. Control channel

Which category does not belong to control channel?a. broadcastb. common control channelc. dedicated control channeld. targeted control channel

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Is used mainly for the transmission of the radio measurement data needed for radio resource management algorithms.a. Slow associated control channel (SACCH)b. Fast associated control channel (FACCH)c. packet associated control channel (PACCH)d. Packet timing advance control channel uplink (PTCCH/U)

It is also possible that new calls are blocked even though there are time slots available to support it. This is calleda. Soft blockingb. hard blockingc. medium blockingd. simple blocking

Are the most delay-sensitive applications, hence retransmissions are not normally performed.a. private servicesb. timing servicesc. Conversational servicesd. Public services

Which represents the amount of data traffic that generates same interference levels than the original voice Erlangs?a. Complex Erlangsb. Simple Erlangsc. Equivalent Data Erlangsd. Total Data Erlangs

Is a protocol originally designed and optimized for fixed-PS networks and may not be optimal for mobile networks without a certain degree of optimization.a. IPv4b. IPv6c. TCPd. IP Address

Effect which refers to the payload (throughput) offered by the radio access network to the transport and application layers.a. Data Link Throughputb. Payload effectc. Physical link effectd. Positive Throughput

Is measured from the PTT press to the indication of the speak permission, it is the time the user has to wait before starting to speak.

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a. Start to Speak (StS) Timeb. Turn Around Time (TAT)c. Push to talk time (PTT)d. Push To Start (PTS)

A scheme in which the transmitter alternately uses the two antennas to transmit bursts or to decorrelate the fading profile of each alternate burst.a. Frequency hoppingb. Frame hoppingc. Antenna hoppingd. Time Hopping

OFDM symbol duration.a. 4 usb. 40 usc. 400 usd. 0.4 us

Refers to a spatial diversity where transmission or reception is performed simultaneously at two or more base station sites and used to combat fast fading.a. Macrodiversityb. Microdiversityc. Spacediversityd. Spatial diversity

Is the work-effort that is required to provide a given spectral efficiency at a given grade of service.a. Spectral efficiency b. Operational efficiencyc. Strategical efficiencyd. Light Efficiency

The ITU-R vision for 4G also calls for integration of technologies, commonlyknown asa. B3G systemsb. homogeneous systemsc. FWA systemsd. 3G.9 systems

Is a special case of multicarrier transmission, where a single data stream is transmitted over a number of lower-rate subcarriers (SCs).a. CSMAb. WCDMAc. DFTd. OFDM

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The variable-rate data modem in KATHRYN was built for the high-frequency band. It used up to 34 parallel low-rate phase-modulated channels with a spacing of 82 Hz.a. 88 KHzb. 82 Hzc. 86 MHz d. 84 KHz

Is responsible for channel allocation procedures, protocol data unit (PDU) addressing, frame formatting, error checking, and fragmentation and reassembly.a. Data Link Layerb. Presentation layerc. MAC sublayerd. TCP/IP

Provides MAC enhancements to support LAN applications with QoS requirementsa. IEEE 802.16b. IEEE 802.11ec. IEEE 802.16.2d. IEEE 802.12a/b

Suffers a known plaintext attack; recovering the pseudorandom string by XORing the plaintext and ciphertext of challenge, which can be eavesdropped from the aira. Decipheringb. Key management:c. Mutual authentication:d. Shared-key authentication

Makes extensive use of protocols above the IEEE 802.11 MAC layer to provide authentication and key management. a. Wireless Robust Authenticated Protocol (WRAP)b. Advanced Encryption Standard (AES)c. Authentication server (AS)d. robust security network (RSN)

Signaling limits of a subscriber loop are based on a. transmission line distanceb. atmospheric conditionc. dc resistanced. bandwidth

Introduced the term PAN to denote a communication between proximal electronic devices by using the body as a conduit for informationa. Zimmerman

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b. Shockleyc. Shannond. Torricelli

Is a point-to-point, narrow-angle (30 cone), ad hoc data transmission standard designed to operate over a distance of 0 to 1m and at speeds of 9,600 bps to 16 Mbpsa. extended LANb. IrDAc. LANd. WPAN

Routing through a tandem switch is an important economic expedient for a telephone company or administration. We could call a tandem switch a a. trunkb. tollc. traffic concentratord. exchange

The unit for measuring how well we can hear a distant party on the telephone is a. Erlang Cb. volumec. Erlang Bd. loudness rating

Is a location within a LATA that has been designated by an access customer for the connection of its facilities with those of a LEC.a. point of presence (POP)b. point of termination (POT)c. cross connectd. retrieval bus

The reference equivalent value, called the ___ was indicative of how loud a telephone signal isa. bit error rate (BER)b. grade of service (GoS)c. phond. overall reference equivalent (ORE)

TASO stands for a. Television Allocations Standards Officeb. Television Allocations Standards Organizationc. Television Allocations Study Organizationd. Television Assignment Study Office

Phase distortion is often measured by a parameter called

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a. envelope delay distortion b. phase angle difference c. indirect dispersion d. buffer angle delay

Is one method of improving the traffic-handling capabilities of switching configurations with limited availabilitya. Multiplexing b. Gradingc. Routing d. Improving

The method by which a waiting call is selected to be served from the pool of waiting calls is called a. standby choice b. call waitingc. queue disciplined. resuming

The SONET STS-1 SPE with a channel capacity of ___ has been designed specifically to transport a DS3 tributary signala. 50.11 Mbpsb. 60.11 Mbpsc. 70.11 Mbpsd. 80.11 Mbps

The payload pointer is contained in the ___ octets in the line overhead (LOH)and designates the location of the octet where the STS SPE beginsa. P1 and P2b. X1 and X2c. Q1 and Q2d. H1 and H2

The __ (like the SONET pointer) allows flexible and dynamic alignment of the VC-n within the AU-n framea. Container-nb. AU-n pointerc. Tributary Unit-nd. VC-n pointer

This is the amount of time required to fill a cell at a rate of 64 kbpsthat is, the rate required to fill the cell with digitized (PCM) voice samplesa. byte delayb. segmentization delayc. packetization delay

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d. overhead delay

Is used to provide transport for synchronous bit streams. Its primary application is to adapt ATM cell transmission to typically E1/DS1 and SDH/SONET circuitsa. AAL-1b. overhead bitsc. SAR-PDUd. nXDS0

Potentially prevents overflow traffic from a selected trunk group from advancing to any alternate routea. Code-block controlb. Cancel Toc. Skip route controld. Cancel From

The telephone receiver, as a converter of electrical energy to acoustic energy, has a comparatively low efficiency, on the order of a. 2% to 3%b. 10% to 15%c. 20 to 35%d. 40 to 50%

Attenuation at 1000 Hz (dB/km) of H88 type of loadinga. 0.69b. 0.88c. 1.88d. 1.16

Is a change of state in the bit stream, a change from a binary 1 to a binary 0, and vice versaa. inversionb. alternation c. translationd. transition

An audio amplifier operates in the frequency range ofa. 0 to 20 Hz b. 20 Hz to 2 kHz c. 20 to 20 kHz d. Above 20 kHz

The theoretical long-term mean rate of occurrence of controlled frame or octet (timeslot) slips under ideal conditions in any 64-kbps channel is consequently not greater than __ in 70 days per international digital link.

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a. 1b. 7 c. 10d. 2

In Digital Network Performance Requirements, a blocking probability of ___ is the quality of service (QoS) objective. With judicious use of alternative routing, a blocking probability of 0.005 might be expected.a. B = 1b. B = 0.01c. B = 0d. B = infinity

Address signaling between switches is calleda. interaddress signalingb. interregister signalingc. intertrunk signalingd. intercircuit signaling

For North American Push-Button Codes, the digit 2 has ___ multifrequency Push-Button Tonea. 852,1477 Hzb. 852,1209 Hzc. 524,1776 Hzd. 697,1336 Hz

The CCITT recommends that if the mean round-trip propagation time exceeds ___ for a particular circuit, an echo suppressor or echo canceler should be useda. 75 msb. 50 msc. 25 usd. 70 us

Refers to traffic from VSAT(s) to huba. inboundb. forwardc. backwardd. rout

A light source, perhaps more properly called a ____ , has the fundamental function in a fiber-optic communication system to efficiently convert electrical energy (current) into optical energy (light) in a manner that permits the light output to be effectively launched into the optical fibera. electroluminescenceb. photon sourcec. spectral line source

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d. photovoltaic light source

Typically show a standard organization of bits and octets and describe the function of each to achieve a certain objectivea. Packetsb. Segmentsc. Protocolsd. Formats

Is a multiport device that allows centralizationa. hubb. routerc. bridged. modem

For class B operation, the collector current flows fora. The whole cycle b. Half the cycle c. Less than half a cycle d. Less than a quarter of a cycle

Transformer coupling is an example ofa. Direct coupling b. AC coupling c. DC coupling d. Impedance coupling

A tuned RF amplifier isa. Narrowband b. Wideband c. Direct-coupled d. A dc amplifier

He is The Prophet of the Integrated Circuit.a. Jack Kilbyb. Robert Noycec. Geoffrey Dummerd. None of the above

_____________________ is a harmful group of bacteria which can live inside cooling towers as well as in hot water systems, warm freshwater ponds, and creeks a. pneumophilab. mesophilicc. Legionella

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d. All of the above

He developed the oldest type of fuel cells which is the Alkaline Fuel Cells a. Francis Baconb. Apolloc. Cygnus atratus Groupd. None of the above

There are few major tidal energy generating power plants in operation. The main one is the __________________ in Northern France built in 1966 and has a capacity of 240 MW.a. Ce Rance Riverb. Ge Rance Riverc. Je Rance Riverd. Le Rance River

What is an impulse commutated inverter which relies on LC circuit and on auxilary thyristor for commutation in the load circuit?a. Auxiliary commutated inverterb. Line commutated inverterc.Load commutated inverterd. None of the above

What is the project that the Computer Society of the IEEE started in 1985 in order to set standards to enable intercommunication among equipment from a variety of manufacturers?a. Project 802 b. Project 800 c. Project 803 d. Project 805

What is the mechanism used by hosts and gateways to send notification of datagram problems back to the sender? a. Internet Control Message Protocolb. Internet Group Message Protocolc. Reverse Address Resolution Protocol d. Internet Group Message Protocol Assume

What layer in the OSI model that is responsible for process-to-process delivery of the entire message?a. Session Layer b. Transport Layer c. Data Link Layer d. Presentation Layer

What pertains to a person who tries to pick up someone elses wireless LAN signals?

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a. war driver b. war detector c. wire tapper d. tapper

We need to download text documents at the rate of 100 pages per minute. What is the required bit rate of the channel?1.345Mbps b. 1.453 Mbps c. 1. 213 Mbps d. 1.636 MbpsSolution:A page is an average of 24 lines with 80 characters in each line. If we assume that one character requires 8 bits, the bit rate is100 x 24 x 80 x 8 = 1,636,000 bps = 1.636 Mbps

Who designed a switch that comes before the banyan switch and sorts the incoming packets according to their final destinations.a. K.E. Bucher b. K.E. Buncher c. K.E. Batcher d. K.E. Brunch

How can we represent the number 21 in ones complement arithmetic using only four bits?a. 5 b. 6 c. 7 d. 8Solution:The number 21 in binary is 10101 (it needs five bits). We can wrap the leftmost bit and add it to the four rightmost bits. We have (0101 + 1) = 0110 or 6

What is an electronic document, similar to a passport that establishes your credentials when you are performing transactions on the World Wide Web?a. Certificate b. Certificate Authority c. Certificate Revocation d. Centrex

What layer enables the user, whether human or software, to access the network and provides user interfaces and support for services such as electronic mail, remote file access and transfer, shared database management, and other types of distributed information services?a. Transport Layer b. Application Layer

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c. Network Layer d. Presentation Layer

What OSI layer is responsible for the delivery of individual packets from the source host to the destination host?a. Session Layer b. Transport Layer c. Data Link Layer d. Network Layer What ISO layer is responsible for dialog control and synchronization?a. Session Layer b. Transport Layer c. Data Link Layer d. Network Layer

In a digital transmission, the receiver clock is 0.1 percent faster than the sender clock. How many extra bits per second does the receiver receive if the data rate is 1 kbps? a. 1 bps b. 2 bps c. 3 bps d. 4 bpsSolution:At 1 kbps, the receiver receives 1001 bps instead of 1000 bps.1000 bits sent / 1001 bits received / 1 extra bps

What results when the analog waveform rises or drops too quickly and the codec may not be able to keep up with the change? a. Quantizing Noise b. Slope Overload Noise c. Delta Noise d. White Noise

What is the modern standard for interconnecting many types of peripheral devices to computers which is also a digital interface that uses a standardized connector (plug) for all serial and parallel type devices?a. Unified Serial Bus (USB) b. Universal Serial Bus (USB) c. User Serial Bus (USB) d. Unified Series Bus

What is a 56,000-bps dial-up modem standard approved by a standards-making organization rather than a single company; it is slightly incompatible with both x2 and k56flex? a. V.90

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b. V.92 c. V.54 d. V.57

The baseband bandwidth for a voice-grade (telephone) signal is:a. approximately 3 kHz b. 20 Hz to 15,000 Hz c. at least 5 kHzd. none of the above

What is the combination of IP address and TCP port number which is used to recognize an application on a server? a. socket b. sniffer c. listserv d. Kerberos

What standard is an improvement of the V.90 standard that provides a higher upstream data transfer rate and also provides a call waiting service, in which a users data connection is put on hold when someone calls the users telephone number?a. V.92 standard b. V.93 standard c. V.94 standard d. V.95 standard

What is an action that occurs when a transmitting or receiving workstation has not received data or a response in a specified period of time?a. timeout b. spoofing c. tunneling d. delay

What is a large, complex program that can manage the common resources on most local area networks, in addition to performing the standard operating system services?a. Network Operating System b. Novell Netware c. Network Monitoring Program d. Network Management Program

"Pink" noise has:a. equal power per Hertz b. equal power per octave c. constant power d. none of the above

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Thermal noise is generated in:a. transistors and diodes b. resistors c. copper wire d. all of the above

What bridge is capable of passing a data frame from one local area network to another when the two local area networks are separated by long distance and there is a wide area network connecting them? a. Remote bridge b. Transparent bridge c. Tele bridge d. External Bridge

The bit rate for each channel in DS-1 is:a. 1.544 Mb/s b. 64 kb/s c. 56 kb/s d. 8 kb/s

Manchester coding:a. is a biphase codeb. has a level transition in the middle of every bit periodc. provides strong timing informationd. all of the above

Compared to standard PCM systems, the quality of the output of a vocoder is:a. much better b. somewhat better c. about the same d. not as good

The reference noise level for telephony is:a. 1 mW b. 0 dBm c. 1 pW d. 0 dBr

The cable used for local loops is mainly:a. twisted-pair copper wire b. shielded twisted-pair copper wire c. coaxial cable d. fiber-optic

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The specs of the old Bell type 103 modem were:a. 300 bps, full-duplex, FSK b. 600 bps, full-duplex, FSK c. 1200 bps, full-duplex, FSK d. 1200 bps, half-duplex, FSK

MNP2, MNP3, MNP4, and MNP10 are all:a. data-compression schemes b. error-correction protocols c. both a and b d. none of the above

The official name for RS-232C is:a. RS-232C b. EIA-232D c. ISO-232C/D d. ANSI-232C

Hardware flow control uses:a. XON and XOFF b. TD and RD c. RTS and CTS d. DSR and DCD

A packet switch type devices that operate at the OSI network layer?a. Routerb. Switchc. Hubd. Intelligent Hub

The minimum number of geostationary satellites required for a global coverage is _____.a. 4 b. 3 c. 1 d. 10

What is the modulating index of an FM carrier having a carrier swing of 100kHz and a modulating signal of 5kHz?a. 10 b. 20 c. 30 d. 40Solution:

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CS = 2 Fdev = 100KHzFdev = 50KHzmf = Fdev/fmmf = 50KHz/5KHzmf =10

A BER tester sends bits at 2000 baud for 10 s. There are total of 50 errors. What is the BER?a. 1 in 1000 bits b. 1 in 2000 bits c. 1 in 400 bits d. 1 in 500 bitsSolution:BER= 50/(2000*10)BER = 5/2000BER = 1/400

What is IEEE 802.6 protocol?a. MANb. WANc. LANd. FDDI

The first stage of a preamp isa. A tuned RF stage b. Large signal c. Small signal d. A dc amplifier

Designated at IEEE 802.3?a. LANb. WANc. MANd. PAN

A traffic of 720 Erlang is also equal to _____ CSS.a. 25920 b. 20 c. 15 d. 21210Solution:Traffic = 720 erlang * 36ccs/erlangTraffic = 25920

It is an elliptical zone between two microwave antennas, where the total path distance nowhere

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varies by more than half of the operating wavelength.a. Skip Zone b. Optimum Zone c. Dellinger Zone d. Fresnel Zone

A sublayer that defines how different stations can access transmission medium?a. LLCb. MACc. GANd. HLDC

Network that will fell between LAN and MAN?a. CANb. PANc. WANd. GAN

DSB Signals occupy ______ the bandwidth of SSB signalsa. Twiceb. Doublec. Tripled. Half

HSDPA is _______a. A specific implementation of GPRSb. A specific implementation of EDGEc. A Up-link high speed W-CDMA connectiond. A specific implementation of W-CDMA

It consists of 36 unique codes representing the 10 digits and 26 uppercase lettersa. Discrete code b. code 39 c. continuous code d. 20 code

The first fixed- length character code developed for machines rather than for peoplea. ASCII Code b. Gray Code c. EBCDIC code d. Baudot Code

The early pioneer in the development of error-detection and correction proceduresa.Richard W. Hamming

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b. William R. Hamming c. Emile Baudot d. Samuel Baudot

The most reliable convolutional coding scheme for error detectiona. checksum b. LRC c. CRC d. VRC

Inaccuracies caused by the representation of a continuously varying quantity as one of a number of discrete values.a. alias signal b. slope overload c. distortion d. quantizing errors

Circuit for digitizing voice at a low data rate by using knowledge of the way in which voice sounds are produceda. vocoder b. codec c. sample-and-hold circuit d. ADC

A coding scheme that records the change in signal level since the precious samplea. unipolar codeb. PPM c. PCM d. delta modulation

Distortion created by using too low a sampling rate when coding an analog signal for digital transmissiona. aliasing b. foldover distortion c. either a or b d. neither a nor b

For the given parameters, determine the energy per bit-to noise power density ratioC = 10e-12 W fb = 60 kbpsN = 1.2 x 10e-14`W B = 120 kHza. 16.2 dB b. 14.2 dB c. 20.2 dB d. 22.2 dB

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Solution:E

bN

0=10 log ;

Eb

N0

=10 log

Eb

N0

=22.2dB

A signal at the input to a mu-law compressor is positive with its voltage one-half the maximum value. What proportion of the maximum output voltage is produced?a. 0.786Vmax b. 0.876Vmax c. 0.867Vmax d. 0.678VmaxSolution:

v=Vmaxln(1+ uVinVmax )

ln(1+u)

v=Vmaxln(1+

(0.5Vmax)Vmax )

ln(1+255)

v=0.876Vmax

A network with bandwidth of 10 Mbps can pass only an average of 12000 frames per minute with each frame carrying an average of 10000 bits. What is the throughput of this network?a. 1 Mbps b. 2 Mbps c. 3 Mbps d. 4 MbpsSolution:Throughput=

12 000 x 10 00060

Throughput=2Mbps

A telephone subscriber line must have an SNRdB above 40. What is the minimum number of bits?a. 3.56 b. 5.63 c. 6.35 d. 3.65Solution:SNRdB = 6.02nb + 1.76 = 40n = 6.35

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The thick coaxial cable implementation of standard Etherneta. 1000 Base-T b. 10 Base-T c. 10 Base 2 d. 10 Base 5

A bit pattern or a character added to the beginning and the end of a frame to separate the framesa. Flag b. Firewall c. Frameguard d. Footprint

An IPv4 has an address space of how many?a. 4294967296 b. 6927694924 c. 2449692769 d. 9672969442Solution:232 = 4294967296

What is the bit rate of STS 1?a. 51.84 Mbps b. 64 kbps c. 100 Mbps d. 2.4 GHz

A block coding technique in which four bits are encoded into a five bit codea. Baudot b. 2B1Q Encoding c. 4B/5B Encoding d. 4A/5A Encoding

A national standards organization that defines standards in the United Statesa. ANSI b. FCC c. ITU d. CCITT

In asynchronous transmission, one or more bits to indicate the end of transmissiona. trailer b. flag c. escape byte d. stop bit

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What is the overhead (number of extra bits) in the DS-3 service? a. 1.368 Mbps b. 1.480 Mbps c. 2.048 Mbps d. 6.024 Mbps

The minimum sampling rate according to Nyquist Theorem.a. equal to the lowest frequency of a signalb. equal to the highest frequency of a signalc. twice the bandwidth of a signald. twice the highest frequency of a signal

It is used in wireless applications in which stations must be able to share the medium without interception by an eavesdropper and without being subject to jamming from a malicious intruder.a. modulationb. Multiple accessc. multiple access d. Spread spectrum

An error detection method which uses ones complement arithmetica. Checksumb. CRCc. Simple-parity checkd. Two-dimensional parity check

It is a connecting device between two internetworks that use different modelsa. Bridgeb. Gatewayc. Repeaterd. router

It is an undesired shift or width change in digital bits of data due to circuitry action which causes bits to arrive at different timesa. alias b. impulsec. jitter d. parity

In PCM system, it is the ratio of the maximum input voltage level to the smallest voltage level that can be quantized a. Dynamic rangeb. Figure of meritc. Quality factor

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d. Noise figureA multiplexer combines four

100-kbps channels using a time slot of 2 bits, determine the frame duration.a. 20sb. 50sc. 100sd. 400sThe link carries 50,000 frames /secThe frame duration = 1/50,000 = 20s

Determine the Hamming distance for the codewords ( 10101, 11001)a. oneb. twoc. threed. fiveSolution:10101 XOR 11001 = 01100(presence of two 1)

An address space is the total number of addresses used by the protocol, such as IPv4 and IPv6. What is the address space of IPv6?a. 232b. 264c. 296d. 2128

It is a standard designed by ITU to allow telephones in the public telephone network to talk to computers/terminals connected to the interneta. H.111b.H.123c. H.321d. H.323

A computer monitor has a resolution of 1200 by 1000 pixels. If each pixel uses 1024 colors, how many bits are needed to send the complete contents of a screen?a. 12 Gigabitsb. 1. 2 Gigabitsc. 120 Megabitsd. 12 MegabitsSolution:1,200 times 1000 pixels x 10 bits = 12 Mb1024 colors requires 10 bits, 210 = 1024

A mammography service examined 327 patients during the third calendar quarter of 1996. 719 films were exposed during this period, eight of which were repeats. What is the repeat rate?

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a. 45.5% b. code 2.45% c. 1.1% d. 54.52%Solution:repeat rate=

no.repeated filmstotal no.of films x100%

repeat rate= 8

719 x 100%

repeat rate= 1.1%

A type of luminescence where the visible light is emitted only during the stimulation of the phosphor.a. fluorescence b. phosphorescence c. after glow d. any of the above

If a heart measures 12.5 cm from side to side at its widest point, and its image on chest radiograph measures 14.7 cm, what is the magnification factor?a. 0.85 b. 1.18 c. 0.15 d. 2.2Solution:MF=

image sizeobject size

MF= 14.7 cm12.5 cm

MF= 1.18

Radiation doses in the range of approximately200 to 1000 rad produce thea. Gastrointestinal (GI) syndromeb. Central Nervous System (CNS) syndromec. Hematologic syndromed. Prodomal syndrome

Ratio of incident to transmitted radiation through a grid ratio of patient dose with and without grida. Bucky factor b. Damadian factor c. Grid ratio d. Roentgen equivalent

A radiographic single-phase unit installed in a private office has a maximum capacity of 100

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milliseconds of 120kVp and 500mA. What is the power rating?a. 42 kW b. 60 kW c. 600W d. 24kWSolution:Power rating= x

mA x kVp1000

Power rating= x(120)

1000Power rating=42 kW

Who completes the development of first computed tomographic (CT) scanner (EMI, Ltd.) in 1973?a. Mistretta b. Forssmann c. Kuhl d. Hounsfield

It is the study of the response of an image receptor to x-raysa. sensitometry b. xeroradiography c. xeroradiometry d. spectrometry

Ratio of radiographic contrast with a grid to that without a grida. grid ratio b. contrast improvement factor c. Collidge factor d. Bucky factor

Analysis of persons irradiated therapeutically with superficial x-rays has shown that the skin erythema dose required to affect 50% of persons so irradiated is about a. 200 rad b. 400 rad c. 600 rad d. 800 rad

ECG recording requires a bandwidth of 0.05 to ____ Hza. 1000 b. 540 c. 100 d. 40

Find the potential generated if blood flowing in a vessel with radius 0.9 cm cuts a magnetic field of 250 G. Assume a volume flow rate of 175 cubic cm per second.

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a. 206 uV b. 309 uV c. 903 uV d. 260 uVSolution:E=

QB50a

E= (250 G)

50(0.9cm)E= 309 uV

Period during which heart contracts.a. Diastole b. Systole c. block mode d. Synapse

Apparatus for measuring blood pressurea. defibrillator b. electrocardiogram c. plethysmograph d. sphygmomanometer.

Given the energy level of 6.624x10^-18 J imparted to an electron stream by an X-ray device, calculate the frequency in MHz.a. 106 MHz b. 45.29 MHz c. 1010 MHz d. 300 MHzSolution:f=

Eh

f= 6.624x10-18

J

6.624x10-34

J-sf= 1010 MHz

It was first noted by Heinrich Hertz in 1887 and won Albert Einstein the Nobel Prize in 1905. It refers to the emission of electrons from a clean metallic surface (phototube) when electromagnetic radiation (light waves or X-rays) falls onto that surface.a. Photoelectric effect b. Compton effect c. Bremsstrahlung d. Mie effect

EST

Unit of radiation exposure or amount of X-ray radiation that will produce 2.08x10^9 ion pairs per cubic centimetre of air at standard temperature and pressure (STP).a. Curie b. Roentgen c. Radiation absorbed dose (rad) d. Gray

An optical electronic device that measures the color concentration of a substance in solution. a. colorimeter b. flame photometer c. spectrophotometer d. chromatograph

Recording of heart soundsa. ultracardiography b. cardioacoustics c. electrocardiogram d. phonocardiography

Recorder for measuring galvanic skin resistancea. electrodermograph b. electromyograph c. electrocorporealograph d. electrogalvanograph