E-Review EST Modules 9-12

8/13/2019 E-Review EST Modules 9-12

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EST Module 9

# Answers Questions

1 Noise rating curves

An agreed set of empirical curves relating octave-band sound pressure level to the center

frequency of the octave bands

2 Flanking transmission

The transmission of sound from one room to an adjacent room, via common walls, floors or

ceilings

3 Sound intensity

What is the sound energy per unit area at right angles to the propagation direction per unit

time?

4 Phon _______ is the unit of loudness level of a sound

5 Sound Intensity

___________ is the average rate of transmission of sound energy in a given direction

through a cross-section area of 1 sq. m. at right angles to the direction

6 Pitch and loudness Sound wave has two main characteristics which are__________

7 Reverberation time Required time for any sound to decay to 60 dB

8 Ultrasonic Sound that vibrates at frequency too high for the human ear to hear (over 20 kHz)

9 Crystal

Which microphone will be damaged if exposed to high temperatues above 52 degrees

Celsius?

10 20 Hz to 20 kHz What is the audio frequency range?

11 95-100dB What is the dB SPL of an auditorium with contemporary music?

12 80-85 dB What is the church dB SPL with speech reinforcement only?

13 Loudness Intensity can also be called as _______

14 Loudness

_____________ is affected by the distance bet. The listener and the source of the sound

and its intensity varies inversely with the square of this distance

15 octaves Much of music is generally referred to in _________

16 Exciter Distortion enhances intelligibility when an ____________ is added

17 Color killer ____________ is used to eliminate color confetti

18 Microphone transducer A _________ converts acoustical energy

19 diaphragm and generating element All microphones have two basic components namely

20 Norris-Eyring When the average absorption is greater than 0.2

21 Interval The ratio of frequencies is termed

22 Pitch

A term which is subjective but dependent mainly on frequency and also affected by

intensity

23 Stephen and Bate For ideal computation of reverberation time


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24 Sound Intensity

______________ is the sound energy per unit area at right angles of the propagation

direction per unit time

25 1200 Hz One octave above 600 Hz is

26 W.C. Sabine Laid the foundations of acoustic theory of buildings

27 Sound An aural sensation by pressure variations in the air which are always produced by somesource of vibrations

28 4.7 units The average absorption for a person is

29 Isotropic An antenna with a unity gain

30 1 What is the maximum efficiency gain of an isotropic antenna

31 isotropic radiator It is useful to refer to an___________. When comparing the gains of directional antennas

32 Near the center of the vertical radiator

For a shortened vertical antenna, where should a loading coil be placed to minimize losses

and produce the most effective performance

33 1 -1000W Typical speech power

34 1000 and 3000 Hz The maximum intelligibility for voice frequency is located between

35 300 to 3400 Hz Presently, this is the standard frequency bandwidth for voice transmission36 4 kHz What is the standard voice channel spacing

37 Sensitivity

The _________ of radio receiver to amplify weak signal and produce a desirable

intelligence at the output speaker

38 MIN A digital identification associated with a cellular system

39 25 How many seconds does a facsimile transmit a standard page?

40 1.88 1.90 GHz What is the frequency band of DECT?

41 6000 Hz Supervisory Audio Tone (SAT) has __________ frequency

42 10 mW What is the power output of PCS?

43 First Selector Which of the ff. responds to the request of a subscriber by sending a dial tone?

44 3 W What is the typical output power of a cellular phone?

45 825 845 MHz Cellular phones transmit in the band from

46 870 890 MHz Cell phone receives in the band from

47 50 dB What is the sensitivity of a cellular receiver?

48 3.4 6.425 GHz What is the frequency range of C-band?

49 2225 MHz

What is the local oscillator (mixer) frequency of the satellite with an uplink frequency in

GHz Band?

50 Gallium Arsenide solar panel array What kind of battery panels are used in some advance satellites?

51 C-band What band does VSAT first operate


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52 14/11 GHz The frequency of Ku band for satellite communications

53 17 degrees The radiation patterns of earth coverage antennas have a beamwidth of approximately

54 1 The efficiency of an isotropic radiator

55 3 30 GHz Most satellites operate in which frequency band

56 500 MHz What is the typical bandwidth of a satellite band?57 70 MHz What is the common up-converter and down-converter IF?

58 QPSK What modulation is normally used with digital data?

59 500 600 ms

The round-trip propagation delay between two earth stations through a geosynchronous

satellite is

60 0.09 dB What is the average insertion loss of fusion splice in fiber optics?

61 0.38 dB What is the insertion loss of connector-type splices for a single mode fiber optics?

62 5 What is the allowable deviation ratio of commercial FM broadcast?

63 20kW

The maximum power suggested by KBP on 919-1312 AM broadcast station in Metro Manila

is

64 3.8 MHz What is the chroma subcarrier signal for color television?65 36 kHz The minimum frequency separation between Frequency of AM broadcasting station

66 6:00 AM to 8:00 PM For provincial station, the classification of prime time blocks for FM shall be

67 525 One complete NTSC scanning cycle field consists of how many lines

68 60 Hz The field rate in the NTSC television system

69 25 kHz What is the maximum frequency deviation for audio modulation in TV transmission

70 Y, I and Q What are the three separate signals derived from a matrix in a color TV transmitter?

71 54 -216 MHz Range of a VHF television transmitter

72 1.8 MHz

What is the approximate bandwidth occupied by the chrominance video signal for color

TV?

73 0% What is the standard video level, in percent PEV for white?74 push-pull amplifier balanced amplifier

75 15750 The number of scanning lines is _____ per second

76 30 Picture frames are repeated at the rate of _____ per second

77 Sensitivity A measure of how well the receiver can respond to very weak signals

78 75kHz What is the allowable freq deviation of a commercial FM broadcast band?

79 Class C The final amplifier is operated as

80

Improve the rejection of the image

frequency

The main function of the RF amplifier in a superhet receiver is to


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81 23.75 29.75 MHz The frequency range for cable TV channel T-13

82 806 and 192 MHz The television frequency which are now allocated to the land mobile services

83

12.2 12.7 GHz for downlink and 17.3

17.8 GHz for uplink

Direct Broadcast satellite based allocation

84 Antennafier Antenna with an embedded amplifier85 Antennaverter Antenna that uses a frequency converter

86

delta matching system What term describes a method used to match a high-impedance transmission line to a

lower impedance antenna by connecting the line to the driven element in two places,

spaced a fraction of a wavelength on each side of the driven element center?

87

gamma matching system What term describes an unbalanced feed system in which the driven element is fed both at

the center of that element and a fraction of a wavelength to one side of center?

88

stub matching system What term describes a method of antenna impedance matching that uses a short section of

transmission line connected to the antenna feed line near the antenna and perpendicular

to the feed line?

89 pillbox antenna sandwiched

90 honey antenna broad-beam biconical horn that has an omnidirectional pattern

91 flat antenna planar antenna that is on the same plane

92 test antenna ______ used for measurement of antenna performance

93 dolph-chebyshev antenna sidelobe level

94 HF frequency band uses over-the-horizon long range tracking with low accuracy and resolution

95 push-pull amplifier balanced amplifier

96 class A(vacuum tube) __________ amplifier. Anode current that conducts all of the time

97 class B(vacuum tube) ________ amplifier anode current that conducts at exactly half of the cycle

98

Class AB (vacuum tube) ___________ amplifier. Anode current that conducts more than half a cycle but not less

than half a cycle

99 Class C (vacuum tube ____________ amplifier.. anode current that conducts less than half of the cycle

100 Fantastron free-running

101 60 wavelengths an electrically large antenna which is greater than

102

the resistance decreases, capacitance

increases

If the mobile antenna is decreased, and frequency decreases

103 Laser Altimeter altimeter at the optical band

104 dual-beam antenna strong clutter

105 Gregorian antenna two concave mirrors


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106

Stack up two yagis that are perpendicular

at each other. The feed are both on the

same plane and fed up at 90 degrees out of

phase.

to make a linearly polarized antenna to a circularly polarized

107 twist-polarization feed polarization

EST Module 10

# Answers Questions

1 Pitch The quality in sound that corresponds to color in light

2 250 and 500 Hz The maximum voice energy is located between

3 Volume unit meter A device used to measure speech volume

4 AWG #19 Which of the following is commonly used wire for subscriber loop design

5 Hybrid circuit A device that converts a 2-wire circuit to a 4-wire circuit

6 GMSK GSM uses what digital modulation technique?

7 Green Which of the following wire is used to transmit signal?

8 852 & 1209 Hz The corresponding frequencies for digit 7 in the touch tone telephone is

9 60 degrees What is the beamwidth of the reflector of the receiving antenna in the base station?

10 12 kHz What is the frequency deviation of the cellular telephone system?

11 1500 and 2300 Hz In FM fax, the frequencies for black and white are

12 Vestigial sideband AM Group 2 fax uses which modulation?

13 Group 3 The most widely used fax standard is

14 QAM Group 3 fax uses which modulation?

15 Thermal Most fax printers are of which type?

16 56kbps What is the transmission speed of group 4 fax?

17 12 kHz What is the max frequency deviation of an FM cellular transmitter?

18 935 960 MHz The base-to-mobile frequency assignment of a GSM system

19 1.23 MHz What is the bandwidth of cellular CDMA system?

20 Modified GSM What is the system used by PCN?

21 Erlang C Blocked calls delay conditions specified probability

22 GFSK The modulation used by DECT

23 890 915 MHz The mobile-tobase frequency assignment for GSM system is


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24 13 The range (in miles) of a cellular CDMA system

25 900 THz The bandwidth of optical fiber

26 800 THz Fiber optic cables operate at frequencies near

27 Inverted

An object farther from a converging lens than its focal point always has a /an _________

image28 Virtual An object nearer to a converging lens than its focal point always has a/an _________ image

29 Larger The real image formed by a spherical mirror is _______relative to its object

30 200,000 hours What is the lifetime of LEDs?

31 50,000 hours What is the lifetime of ILDs?

32 Step-index multimode What type of fiber has the highest modal dispersion?

33 LED Is a non-coherent light source for optical communications

34 Semiconductor Which type of laser is the simplest to modulate directly by changing its excitation?

35 LED

Which of the following is used as an optical transmitter in the Fiber Optical

Communications?

36 Single-mode graded index

Which of the following is not a common type of fiber optic cable?37 dB/km Cable attenuation is usually expressed in

38 2 km Which cable length has the highest attenuation?

39 X-rays Which of the following is not part of the optical spectrum?

40 400 750 nm The wavelength of visible light extend from

41 Single-mode step index Which type of fiber-optic cable is the most widely used?

42 Single-mode step-index Which type of fiber-optic cable is best for very high speed data?

43 Single mode step-index Which type of fiber-optic cable has the least modal dispersion?

44 99.9999% The ultrapure glass used to manufacture optical fibers is approx. ______ pure

45 Plastic-clad-silica In fiber optics, PCS stands for

46 Ampere/Watt What is the unit of responsitivity?47 700 1200 nm Infrared range for fiber optics

48 higher losses Which of the following is a disadvantage for plastic fiber optics

49 Optoisolator An IC that represents a short distance one-way optical communications system

50 High losses Why are visible-light LEDs not used for fiber optics?

51 40 GHz What is the frequency limit of an optical fiber?

52 0.1dB The mechanical splice attenuation loss is _______ dB or less

53 1.5 Refractive index of glass

54 2.0 Refractive index of diamond


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55 0.1 dB or less How much is the power loss of the fusion splice?

56 Pan/tilt device A mechanism or device which enables the TV camera to move in lateral and tilting motion

57 Wide angle What class of TV camera lens used to cover short distances?

58 955 2055 kHz What is the local oscillator frequency in commercial AM broadcast if it is equal to 455 kHz?

59 +2000 kHz What is the frequency tolerance of an FM Radio Broadcast station?

60 1

A newscast is a distinct unit of a program with a maximum news content of ________

minute(s) excluding intro, extro, headline and commercial load.

61 15

Commercial load for radio shall not exceed ____ minutes for one hour program in Metro

Manila

62 17

Commercial load for radio shall not exceed ______ minutes for one hour program outside

metro manila

63 6

Program interruption for the airing of commercial in Metro Manila shall not exceed _____

breaks in every program hour

64 6

Program interruption for the airing of commercial outside Metro Manila shall not exceed

_____ breaks in every program hour

65 6:00 AM to 8:00 PM For Metro Manila, the classification of prime time blocks for FM shall be

66 52 microseconds __________ is the time duration for one horizontal trace

67 A and B above (left to right, top to bottom) For NTSC TV system, the image is scanned from choices

68 525 One complete NTSC scanning cycle field consists of how many lines

69 15.75 Hz What is the horizontal synch/ blanking pulse rate?

70 60 Hz What is the vertical synch/ blanking pulse rate?

71 Beam production What is the purpose of an indirectly-heated cathode in a cathode ray tube?

72 25 kHz What is the max frequency deviation for audio modulation in TV transmission?

73 4.5 The video carrier and the audio carrier are separated by _______ MHz

74 470 - 890 MHz Range of a UHF television transmitter

75 Comb

__________ is the most effective filter for separating luminance and chrominance freq

components

76 75% What is the standard video level, in percent PEV for blanking?

77 70% What is the standard video level, in percent PEV for black?

78 Video detector The sound and video signals are separated at the ______ of the TV receiver

79 F3F Type of emission produced when a freq modulated transmitter is modulated by a TV signal

80 Contrast Video signal amplitude determine the picture quality called

81 88 108 MHz The FM broadcast band is from


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82 N What is the first letter-symbol for emission of unmodulated carrier?

83 180 186 MHz Channel 8 freq range allocation in cable TV

84

5950 and 26100 kHz International broadcasting (short wave) uses freq between ________ in accordance with

international agreements

85

ITFS Three stations are licensed to eligible educational entities for the distribution of program

material to students enrolled in instructional curricula

86 3 For the allocation of freq in the world, ITU divides the world into how many regions?

87 Sweep Generator Voltage or current generator that displays time sweep on radar systems

88 Mark Generator Shaping/generation of scale marks on a radar display

89 Weiner Filter

90 Gunn Effect 3kW/cm

91

X-band frequency band that is used in short range surveillance, long range tracking with high

resolution and accuracy

92 L-band frequency band that is used in long range surveillance with low resolution

93

VHF and UHF frequency band that is used in long range surveillance with low to medium resolution and

accuracy

94 Mm wave band frequency band that uses very small antennas, airborne and space use

95 Aperture Blockage blocking a portion of the aperture in radar systems

96 Grass Noise in radar systems

97 Hit Echo with a single pulse

98 APD Fastest optical receiver

99

Echo box receives a portion of the transmitted pulse and retransmits it back to the receiver as a

slowly decaying transient

100

Eclipsing radar system in which range ambiguity and range __________ are reduced by frequency

diversity and alteration of pulse periodicity

101 Diffraction Radiation Generator

EST Module 11

# Answers Questions

1 4:1 Impedance matching ratio if a coax balun

2 No power is applied When VSWR is equal to zero

3 Reflection Coefficient Ratio of reflected voltage to the forward travelling voltage


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4 1

The standing wave ratio is equal to __ if the load is properly matched with the transmission

line

5 Resistive load at the resonant frequency Transmission lines when connected to antennas have

6 36 CCS 1 Erlang

7 83 ohms For an Air dielectric, two wire line, the minimum characteristic impedance value is

8 300-3400 Hz Telephone channel has a band pass characteristic occupying the frequency range of

9 0-4 kHz Nominal Voice grade using PTN has an ideal passband of

10 300 -3400 Hz Standard analog telephone channel

11 G.122

CCITT recommendation for a preparation of loss plan, a variable loss plans and a fixed loss

plan

12 Quarter-wave Matching One method of determining antenna impedance

13 VF Repeaters

__ are unidirectional amplifiers having 20-25 decibel gain that are placed about 75 km

apart used to compensate for losses along the telephone line

14 Single-wire line A single conductor running from the transmitter to the antenna

15 waveguides

The transmission lines which can convey electromagnetic waves only in higher modes is

usually

16 to keep the waveguide dry Why is nitrogen gas sometimes used in waveguide?

17 F3C and A3E Emission designation for a facsimile

18

the line behaves as a parallel tuned circuit

in relation to the generator If a quarter-wave transmission line is shorted at one end

19 any convenient value

A 50 ohms transmission line is feeding an antenna which represents a 50 ohms resistive

load. To shorten the line, the length must be

20 120 ohms Is not a common transmission impedance

21

transversely across the narrow dimension

of the waveguide

A rectangular waveguide is operating in the dominant TE10 mode. The associated flux lines

are established

22

at the beginning and at the end of the

cable The outer conductor of the coaxial cable is usually grounded

23

at a distance of one quarter wavelength

from the sealed end

If a rectangular waveguide is to be excited in the dominant mode, the E-probe should be

inserted

24 1 Desirable SWR on a transmission line

25 Reflectometer Measures SWR

26 300 ohms

214-056 twin lead which is commonly used for TV lead-in has a characteristics impedance

of


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27 0 Most desirable reflection coefficient

28 Phon Unit of loudness level

29 Mel Unit of Pitch

30 115.56 dB SPL 120 micro bars of pressure variation is equal to

31 If the distance between the listener and the source of the sound is doubled, the intensity isreduced to

32 4 times as great

If the distance between the listener and the source of the sound is decreased the original

amount, the intensity of the sound is

33 Threshold of hearing The minimum sound intensity that can be heard is termed

34 Distortion Is an undesired change in wave form as the signal passes through a device?

35 Distortion Diagonal clipping in envelope detection will result in

36 Multiplication

Is a frequency change process, whereby the phase deviation and frequency deviation are

multiplied by some fixed constant?

37 Frequency Modulation

The modulation system is ___ if the modulating frequency is doubled, the modulation index

is halved, and the modulating voltage remains constant

38 Frequency Deviation

In FM, Carsons Rule states that the bandwidth is equal to twice the sum of the modulating

frequency and __

39 triggered multivibrator One implementation of a pulse averaging discriminator

40 higher value of operating power The advantage of a high level modulated AM transmitter is

41 Interference to other radio services Is the bad effect caused by over modulation in AM transmission?

42 have the same frequency Two different signals can be coherent if they

43 120 ohms Not widely used impedance

44 Spectrum Analyzer

Test instrument that displays the carrier and the sidebands amplitude with frequency to

frequency?

45 Buffer Stage in a radio transmitter that isolates the oscillator from the load

46 3 components A single tone amplitude modulated wave has

47 1300 ohms The resistance limit for No. 2 Crossbar Exchange (US)

48 0.51 dB/1000 ft AWG # 26 has a typical loss of

49 Crosstalk Cause a herringbone pattern in facsimile

50 12 How many simultaneous calls does each DECT system can support?

51 1983 Cellular mobile system was first operated in

52 3 RG-58 cable has a loss of about __ dB at cellular frequencies up to 15 feet length

53 10 mW Power output of Personal Communications System (PCS)


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54 1000 TACS is a cellular system with ___ channels

55 45 MHz Frequency separation between the transmitter and receiver

56 825.015/870.015 MHz For channel 1, transmit/receive frequency

57 666 The number of transmit/receive channels in the cellular system is

58 80 km The transmission range of cellular telephony is generally about

59 Calling channel Hailing channel

60 MTSO

All of the cell base stations are linked together by __ which serves as the central office and

management node for the group

61 Echo Suppressor

Is a voice operated device that inserts a high loss in the opposite direction of transmission

of the talking party

62 TPS

Type of connector arrangement wherein a customer may move to another location and still

retain the telephone number

63 Poisson

Block calls held condition specified the held probability at at time period equal to an

average holding time

64 TDMA Multiple access used by DECT

65 GFSK Modulation technique used by DECT

66 Digital AMPS Voted cellular digital standard at TIA

67 416 Number of channels for Band A and for Band B in Digital AMPS

68 Jaynes maximum entropy principle

__ of a data reduction says that when reducing a set of data into the form of an underlying

mode, one should be maximally non-commital with respect to missing data

69 6000 Hz Supervisory Audio Tone (SAT) has __ frequency

70 100000 System capacity of AMPS

71 0 dBm = 0 V.U. A sine wave

72 Sound Intensity

What is the sound energy per unit area at right angles to the propagation direction per unit

time?

73 Sound Intensity

Is the average rate of transmission of sound energy in a given direction through a cross-

section area of 1 sq. m. At right angles to the direction

74 1 Maximum Voltage to be perfectly matched in trans line

75 1 to 100 GHz Microwave frequencies are normally regarded as those in the range of

76 to keep the electrons from spreading out What is the purpose of the electromagnetic field which surrounds travelling wave tube?

77 Klystrons High power TWT are replacing what in microwave amplifiers?

78 Blue Color Code for Channel 1 in Light Spectrum

79 6 dB What is the increase in SPL in dB if the pressure is doubled?


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80 Base to Mobile In PCS, Forward Channel is

81 Reverse Channel Mobile to Base in PCS

82 Terahertz Photonics

83 900 How many groups are the in a super jumbo groups?

84 564 3084 kHz FDM U600 Mastergroup

85 No refraction will occur If Angle of incidence is zero

86

Huffman Code A source code whose average world length approaches the fundamental limit set by the

entropy of a discrete memory less source

87 10 Peak power level for klystron amplifier

88 1.55 micro meters Windows longest wavelength

89

Non- resonant The impedance measured at the input of the transmission line when its length is infinite or

when it is terminated by its own impedance is known as the characteristic impedance in a

____ line

90 Dissipation Factor Relative Energy loss level of a capacitor

91 Installation In fiber optic, ___ range is critical

92 It is relatively free of spurious signal Control oscillator synthesizer is preferred over direct one because

93 the MTSO checks your SID in the data base In cellular telephony, roaming?

94 10-20 dB/km Optical fiber loss?

95 300 3400 Hz Voice grade channel

96 140 Amplitude characteristic of a video signal, where pure white is define in IRE, it has a total of

97 IMPATT Low power radar uses

98 Operational Amplifier Use in oscillator, amplifier, negative feedback, etc.

99 DVB-T Modulation technique in Europe

100 10 mW FCC AM broadcast channel 10 has a power of

EST Module 12

# Answers Questions

1 Areocentric Orbit An Orbit for planet Mars

2 Ionosonde Use to measure or examine ionosphere

3

Gaussian Noise, White Noise, Thermal

Noise

Noise from random acoustic or electric noise that has equal energy per cycle over a

specified total frequency band

4 290 K Reference Noise Temperature


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5 CCITT G. 151 Standard that recommends crosstalk limit

6 CCITT Rec. G. 172 Standard that utilized in inter-modulation noise rates on PCM audio channels

7 800 Hz Reference frequency of CCITT phosphometric noise measurement

8 15 to 160 MHz Industrial Noise

9 Crosstalk Interference coming from other channel

10 -90 dBm Reference noise level

11 frequencies above 30 MHz Atmospheric noise or static is not a great problem at

12 -85 dBm Reference level for noise measurement, F1A weigthed

13 -90 dBm Reference tone level for dBrn

14 Transit Time Noise Types of noise becomes of great importance at high frequencies

15 11 years The solar cycle repeats the period of great electrical disturbance approximately every

16 Solar Noise Noise whose source is within the solar system

17 Noise Density Total noise power present in a 1-Hz bandwidth

18 90

What is the relation in degrees of the electric and magnetic fields in an electromagnetic

wave?

19 3 to 30 MHz High frequency Range

20 3 to 3 MHz Medium Frequency Range

21 Always seems less than its actual depth The depth of an object submerged in a transparent liquid

22 A fixed point in an electromagnetic wave What is a wavefront?

23 1 W VHF ship station transmitters must have the capability of reducing carrier power to

24 Spread-Spectrum Communications

A wide bandwidth communications systems in which the RF carrier varies according to

some predetermined sequence

25 Is greater than 1 The index of refraction of a material medium

26 12 GHz Cannot be used in beyond-the-horizon terrestrial communications without repeaters

27 UHF Tropospheric scatter is used with frequency range

28

may occur around the edge of a sharp

obstacle Diffraction of electromagnetic waves

29 X-rays The highest frequencies are found in

30 90 degrees

When a light ray approaches a glass-air interface from the glass side at the critical angle,

the angle of refraction is

31 8000 lx The minimum illumination recommended for reading

32 Direct Wave Microwave signals propagate by way of

33 300 kHz to 3 MHz Ground wave communications is most effective in


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34 HF Line-of-sight communications is not a factor in

35 Inverse Square Law States the power density is inversely proportional to the distance from its source

36 MUF

Highest frequency that can be used for skywave propagation between two given points on

earth

37 Diversity Is not a cause of fading?

38 BPSK Cellular CDMA system uses this type of modulation method

39 Attenuation Is the progressive decrease of signal strength with increasing distance

40 towards the earth If k-factor is greater than 1, the array beam is bent

41 10 GHz Rainfall is an important factor for fading of radio waves at frequencies above

42 Delayed Spreading In microwave transmission using digital radio, what causes most inter-symbol interference?

43

waveguide match, cavity match, direct

coax-helix match Coupling into and out of a travelling wave tube can be accompanied by

44 Magnetron A high-power microwave pulse of the order of megawatts can be generated by a

45 1 to 100 GHz Microwave frequencies are normally regarded as those in the range of

46 loran C: 100 KHz Used for modern loran navigational system

47 Pulse Width Pulsed frequency is equal to

48 156.76 MHz and 156.8 MHz Used by a Class-C Emergency Position Indicating Radio Beacon (E.P.I.R.B)

49 Radio Frequency It is concerned in the design of an antenna system for pulsed radar set

50 LF Band The operating frequency of loran C lies within the

51 8000 MHz A travelling-wave tube is used at frequencies in the order of

52 22 GHz Microwave frequency

53 Gunn Popular microwave oscillator

54 Tunnel Type of diode that does not ordinarily operate in reverse bias

55 Reflex Klystrons Low-power Gunn diodes are replacing

56 Wider Bandwidth The main advantage of a TWT over a klystron for microwave amplification

57 Klystrons High power TWTs are replacing what in microwave amplifiers?

58 0.6

The optimum clearance from an obstacle in a microwave system is accepted as ___ of the

first Fresnel zone radius

59 Infinity

The microwave beam curves the same than that of the earth when the value of the

correction factor k equals

60 Speed The Doppler Effect allows which characteristics of a target to be measured?

61 Gunn Diode Low-power radar transmitters and receivers use

62 10 GHz Typical radar frequency


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63 K Band A microwave band of 10.9 to 36 GHz

64 92.4 + 20 log f + 20 log d A microwave communications system space loss calculation formula

65 Litz Wire

A wire used to reduced skin effect The CCIR hypothetical reference circuit covering a

distance of 2500 km consists of a total of how many hops?

66 54

The CCIR hypothetical reference circuit covering a distance of 2500 km consists of a total of

how many hops?

67 183 GHz Water causes more attenuation particularly on what frequency?

68 60 GHz At what frequency does oxygen cause excessive attenuation?

69 43500 MHz What frequency does a radio altimeter operate?

70 1300 Hz RF carrier of the middle marker is modulated at

71 30 The first Philippine Mabuhay Satellite has how many channels?

72 36 The first Philippine agila 1 will have how many transponders?

73 38 AsiaSat 1 covers how many countries of Asia?

74 200 dB Approximate path loss from satellite-to-earth station

75 0.5s Delay time for satellite transmissions from earth transmitter to earth receiver

76 500 MHz The bandwidth of C-band satellite frequency band in US

77 14 A mobile satellite array has usually how many elements?

78

FDMA A method of multiple accessing where a given RF channel bandwidth is divided into smaller

frequency band

79 22,300 mi Height of satellite in a synchronous equatorial orbit

80 3 GHz to 30 GHz Most satellites operates at

81 FM Type of modulation used on voice and video signal

82

Syncom 1 The first satellite launched for a geosynchronous orbit but unfortunately lost during orbit

injection

83 Square root of the dielectric constant The velocity factor is inversely proportional with respect to the

84 1710-1785 MHz GSM 1800

85 1930-1990 MHz GSM 1900

86 Region 2 In USA and England, what regional coding is for DVD

87

Quantizing Noise Noise occurring in the presence of signal resulting from a mismatch between the exact

value of an analog signal and the closest available quantizing step in a digital coder

88 Audimeter Equipment use in measuring the ratings of a channel

89 Inter-carrier sound In television, 4.5MHz is the

90 2 Mbps 802.11 legacy data rates approximately


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91

15 GHz A waveguide has a cut-off frequency of 17GHz. Which signals will not be passed by the

waveguide?

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E-Review EST Modules 9-12

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