iecep est1 april 2011

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In the world of computer systems, IP stands for

a. Interface Peripherals

c. Intellectual Property

d. Interoffice Process

The IEEE standard for Wireless LANs that operates at 2.4 GHz band with a data rate of 11Mbps.

a. 802.2

b. 802.9

d. 1394

In telecommunications, it is the cable group that forms the primary path between two switching stations.

b. Line

c. channel

d. circuit

The technique that uses the BPSK vector relationship to generate an output with logical 0s and 1s determined by comparing the phase of two successive data bits is

a. CSU/DSU

c. TDM

d. CVSD

A special digital modulation technique that achieves high data rates in limited-bandwidth channels is called

b. Internet Protocol

c. 802.11

a. Trunk

b. DPSK

a. Delta modulation

b. Pulse-coded modulation (PCM)

c. Quadrature amplitude modulation (QAM)

d. Pulse amplitude modulation (PAM)

FSK systems are much superior to two-tone amplitude-modulation systems with respect to

Using an oscilloscope to display overlayed received data bits that provide information on noise, jitter, and linearity is called a(n)

The type of radio transmission that uses pseudorandomly switched transmissions is known as

The acronym CDMA refers to ________.

The acronym OFDM refers to ________.

Using radio to transmit gathered data on some particular phenomenon without human monitors is known as

a. Noise performance

b. Bandwidth requirements of the channel

c. Ionospheric fading characteristics

d. Power consumption

a. Eye pattern

b. Constellation pattern

c. Statistical concentration

d. Loopback

a. Facsimile

b. Spread spectrum

c. Synthesizing

d. Compression

a. Channel-division multiple-access systems

b. Carrier-division multiple-access systems

c. Capture-division multiple-access systems

d. Code-division multiple-access systems

a. Orthogonal Frequency Division Multiplexing

b. Over Frequency Division Multiplexing

c. Optional Frequency Division Modulation

d. Orthogonal Frequency Division Modulation

a. Radio facsimile

b. Radio telemetry

c. Radio teletype

d. Radio multiplexing

The acronym for the form of data transmission in which the modulating wave shifts the output between two predetermined frequencies is _____.

a. FSK

b. PSK

c. FPF

d. FSA

Pseudorandom implies a sequence that can be _____ but has the properties of randomness.

a. decoded

b. detected

c. re-created

d. minimized

______ implies that both analog and digital signals share the same channel bandwidth.

Telemetry may be defined as _____ metering.

OTA is an acronym for ________.

Why isn't Morse code well suited to today's telegraphic equipment?

a. AM

b. Hybrid

c. FM

d. RF

a. distance

b. specialized

c. remote

d. data

a. Over The Amplitude

b. Over The Air

c. On The AM

d. On Time Asynchronous

a. It uses an automatic request for repetition.

Which is not a type of pulse modulation?

PPM and PWM are superior to PAM systems in

Half-duplex operation involves communication

A procedure that decides which device has permission to transmit at a given time is called

The bit error rate is

b. It has excessive redundancy built into the code.

c. The parity bit is difficult to detect.

d. Differing between various widths of the pulses is an extremely complicated process.

a. Pulse-amplitude modulation (PAM)

b. Pulse-width modulation (PWM)

c. Pulse-frequency modulation (PFM)

d. Pulse-position modulation (PPM)

a. Noise characteristics

b. Bandwidth characteristics

c. Simplicity in design

d. Frequency response of the intelligence signal

a. In one direction only

b. In both directions, but only one can talk at a time

c. Where both parties can talk at the same time

d. All the above

a. Line control

b. Protocol

c. Flow control

d. Sequence control

a. The number of bit errors that occur for a given number of bits transmitted

b. The most common method of referring to the quality of a digital communication system

c. Virtually the same as the error probability

d. All the above

The major difficulty faced by delta modulators is

The AT&T T1 lines

In regards to ATM, the cell rate is variable with _____ service class.

The ground wire in a USB cable is ______.

A(n) ________ is used to allow a digital signal to be transmitted on an analog channel.

The bit ________ is the amount of power in a digital bit for a given amount of time.

a. Excessive noise producing errors

b. Slope overload

c. Insufficient frequency response of the intelligence signal

d. Complexity of design

a. Use 16-bit PCM code and include 24 voice channels

b. Use delta modulation and include 48 voice channels

c. Use 8-bit PCM code and include 24 voice channels

d. Use delta modulation and include 24 voice channels

a. ABR

b. VBR-NRT

c. CBR

d. CRB

a. Yellow

b. Blue

c. Red

d. Brown

a. codec

b. alias

c. modem

d. PSK

a. error

b. energy

c. joule

The relationship for bit rate to ________ bandwidth is defined by the Shannon-Hartley theorem.

________ T1 indicates that only a portion of the data bandwidth of a T1 line is being used.

The acronym ________ is used to represent the technique that transports data from multiple users over the same data channel.

A class ________ amplifier includes a PWM generator.

The acronym ________ refers to peripheral computer equipment such as a modem, printer, or mouse.

The ________ source is the heart of both the encoder and decoder in radio-telemetry.

d. hp

a. modem

b. codec

c. channel

d. amplifier

a. Fractional

b. Distributed

c. Segmented

d. Partial

a. CDMA

b. DDMA

c. CDM

d. TDMA

a. AB

b. D

c. F

d. C

a. CEC

b. CEP

c. DCE

d. CIE

The advantage(s) of digital and/or data communications over analog include

In an S/H circuit, the time that it must hold the sampled voltage is

Error signals associated with the sampling process are called

Which of the following is not a common RZ code?

A(n) ________ is a single LSI chip containing both the ADC and DAC circuitry.

a. data

b. current

c. dc

d. voltage

a. Noise performance

b. Regeneration

c. Digital signal processing

d. All the above

a. Aperture time

b. Acquisition time

c. Flat-top time

d. Dmin

a. Foldover distortion

b. Aliasing

c. Nyquist rate

d. Foldover distortion and aliasing

a. RZ-unipolar

b. RZ-bipolar

c. RZ-M

d. RZ-AMI

a. modem

b. DSP

c. codec

d. ASIC

The NRZ digital signal-encoding format has a ________ component in the waveform.

Reed–Solomon codes utilize a technique called ________ to rearrange the data into a nonlinear ordering scheme to improve the chance of data correction.

As per Philippine standard, frequency allocation of AM Radio Broadcasting is from…

Part of broadcasting in a day that refers to that period of time between 1000 UTC to 2200 UTC. UTC stands for Universal Time Coordinates.

An AM broadcast service area in which groundwave field of 1mV/m (60dBu) is not subject to objectionable interference or objectionable fading.

In antenna mast or tower construction, the required obstruction painting and/or lighting must be imposed on mast or tower more than … from the ground level.

a. dc

b. sinusoidal

c. harmonic

d. parity

a. pseudorandom

b. BSC

c. interleaving

d. quantizing

a. 535 to 1605 kHz

b. 526.5 to 1605 kHz

c. 535 to 1705 kHz

d. 526.5 to 1705 kHz

a. daytime period

b. nighttime period

c. experimental period

d. primetime period

a. primary service area

b. secondary service area

c. intermittent service area

d. none among these

a. 100 ft

b. 150 ft

Regarding the design of AM antenna, what should be the polarization of the radiator?

As per Phillipine standard, what is the minimum frequency separation in any service area for adjacent AM radio stations?

What is the maximum power allowable for remote pick-up stations used as broadcast auxillary services for AM and FM broadcast stations?

What is the classification of an FM station having an ERP not exceeding 30kW?

What is the modulation used for the stereophonic subcarrier of FM composite baseband signal?

c. 200 ft

d. 250 ft

a. horizontal

b. vertical

c. circular

d. elliptical

a. 40 kHz

b. 200 kHz

c. 36 kHz

d. 300 kHz

a. 10 W

b. 15 W

c. 35 W

d. 200 W

a. Class A

b. Class B

c. Class C

d. Class D

a. AM DSB FC

b. AM DSB SC

c. AM SSB

d. AM VSB

What is the pilot subcarrier frequency used in FM stereophonic transmission?

Frequency allocation of FM broadcast in the Philippines…

What is the color TV system adopted by the Philippines?

Exact value of color subcarrier frequency (MHz) is …

Determine the visual carrier frequency of TV channel 9.

What is the maximum allowable ERPs for channels 7 – 13 in Metro Manila and Metro Cebu?

a. 15 kHz

b. 19 kHz

c. 30 kHz

d. 38 kHz

a. 535 – 1605 kHz

b. 88 – 108 MHz

c. 50 – 15000 Hz

d. 174 – 216 MHz

a. NTSC

b. PAL

c. SECAM

d. none among choices

a. 3.579554

b. 3.579455

c. 3.580545

d. 3.579545

a. 175.25 MHz

b. 187.25 MHz

c. 193.25 MHz

d. 199.25 MHz

a. 100 kW

b. 316 kW

c. 350 kW

d. 1 MW

At NTSC standard, the number of lines per frame = ________ lines/frame

At NTSC standard, line frequency = 15734.264 Hz. What is the equivalent line period?

Nominal RF bandwidth of NTSC TV channel…

A land mobile station used for the transmission of TV program materials and related communications from the scenes of events occuring at remote points from TV broadcast st

The highest frequency that can be used for skywave propagation between two specific points on earth’s surface.

b. MUF

c. Cut-off frequency

d. mid frequency

Shows constant phase of electromagnetic waves; formed when points of equal phase on rays propagated from the same source are joined together.

a. source

a. 485

b. 525

c. 625

d. 585

a. 66.556 usec

b. 65.556 usec

c. 63.556 usec

d. 64.556 usec

a. 4.2 MHz

b. 4.5 MHz

c. 6 MHz

d. 5.35 MHz

a. TV Pick-up station

b. TV STL station

c. TV Inter-city Relay station

d. TV Satellite link station

a. Critical Frequency

b. vector

c. wavefront

d. isotropic

Variation in signal loss caused by natural weather disturbances.

a. attenuation

b. fading

c. spreading loss

d. weather loss

Determine the radio horizon for a transmit antenna that is 200 m high and a receiving antenna that is 100 m high

b. 96.5 km

c. 95.87 km

d. 97.5 km

Determine the path loss for a frequency of 800 Mhz at a distance of 0.6 km.

b. 82.06 dB

c. 82.02 dB

d. 88.06 dB

Determine the maximum usable frequency in MHz for a critical frequency of 10 MHz and an angle of incidence of 45 degrees.

a. 12.14

b. 13.41

d. 15.41

The power density at a point from a source is 0.001μW, and the power density at another point is 0.00001 μW, determine the attenuation in decibel.

a. -40

b. -10

c. -30

d. -20

a. 99.5km

a. 86.02 dB

c. 14.14

The height above the earth’s surface from which a refracted wave appears to have been reflected…

a. actual height

c. average height

d. mean height

The minimum distance from a transmit antenna that a skywave at a given frequency will be returned to earth.

b. skip zone

c. distance to radio horizon

d. refracted zone

The highest frequency that can be used for skywave propagation between two specific points on earth’s surface.

b. MUF

c. Cut-off frequency

d. center frequency

Electromagnetic waves that are directed above the horizon level.

a. ground waves

b. surface waves

c. sky waves

d. space waves

Characteristic impedance of free space.

a. 277

b. 300

d. 75

The orientation of the electric field vector in respect to the surface of the earth.

b. linearization

c. propagation

b. virtual height

a. skip distance

a. Critical Frequency

c. 377

a. polarization

d. redirection

The condition that occurs when the refractive index of the air decreases with height much more rapidly than normal so that radio wave may then be reflected back to earth to f

a. reflection

b. diffraction

d. sub refraction

An instrument used to measure virtual height by transmitting vertically upward a pulse modulated radio wave.

a. altimeter

b. ionogram

c. ionometer

d. ionosonde

What is the mode of radio wave propagation that utilized ionosphere as a medium of transmission and / or reception of radio signals?

An ionosphere layer also termed as “absorption layer” because it absorbs most of the frequencies above 100 kHz is known as the … layer.

As per ITU-R Recc. V.431-6 Tables 1 & 2 Wavelength Classifications, what is the classification of Super High Frequency?

What is a diversity scheme that uses two (2) separate antennas and receivers for each single transmitter?

c. super refraction

a. ground wave

b. sky wave

c. space wave

d. all of these

a. D

b. E

c. F1

d. F2

a. metric

b. decimetric

c. centimetric

d. millimetric

What is a diversity scheme that uses two (2) different frequencies in a simplex path?

The power density is inversely proportional to the square of the distance from the source. This law is known as…

The lowest portion of the ionosphere that is useful for long-distance communication by amateurs; about 100 to 115 km above the earth is known as the… layer. This is often

A graph which shows the radiation in actual field strength of electromagnetic fields at all points which are at equal distance from the antenna is known as…

A phenomenon on the surface of the sun with appearance and disappearance of dark irregularly shaped areas.

a. frequency diversity

b. space diversity

c. angle diversity

d. quadrature diversity

a. frequency diversity

b. space diversity

c. angle diversity

d. quadrature diversity

a. Faraday’s law

b. Snell’s law

c. Inverse Square law

d. Gauss law

a. D

b. E

c. F1

d. F2

a. Frequency Response

b. Radiation Pattern

c. Smith Chart

d. FCC F(50,50) Graph

a. SID

b. 11-year sunspot

c. Sporadic E-layer

d. Ionospheric storms

What should be done to increase the transmission distance at frequencies higher than HF bands?

Which of the following factors must be considered in the transmission of a surface wave to reduce attenuation?

a. increase antenna gain

b. increase antenna height

c. increase transmitter power

d. increase receiver sensitivity

a. electrical properties of the terrain

b. antenna polarization

c. all choices

d. frequency

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