Communications Engineering Coaching Materials: Section 5 Module 10

This is the Section 5 Module 10 of the compiled Communications Coaching Materials taken from various sources including but not limited to past Board Examination Questions in Electronic System and Technologies (EST), Communications Books, Journals and other Communications References. This particular Coaching Notes in Communications Engineering has random Questions and Answers in random topics. Make sure to familiarize each questions to increase the chance of passing the ECE Board Exam.

Communications Engineering Coaching: Section 5 Module 10

#	Questions	Answers
1	new name of CCITT	ITU-T
2	Impedance matching ratio of a coax balun	4:1
3	load matching over a range of frequencies	double stub
4	T1 for TDM system	24
5	the final amplifier of either FM or AM transmitter operates as class ____	C
6		8 bits
7	where maximum current and minimum voltage values on a resonant Hertz dipole exist	center of the antenna
8	circuit that is turned on	request to send
9	emission designation for facsimile	A3E and F3C
10	In satellite communication, the geostationary satellites are conveniently located with respect to the equator at ______	0 degrees latitude
11	refers to a double sideband full carrier	A3E
12	the voltage node of a half-wave antenna exists	at feed point
13	the modulation technique used by GSM cellular system	Gaussian Minimum Shift Keying
14	ferrite device that can be used in line of a duplexer to isolate a microwave transmitter and receiver when both are connected to the same antenna	Circulator
15	in shipboard satellite dish antennas system, azimuth is referred as the _____	horizontal aiming of the antenna
16	the total useful information processed or communicated over a specific amount of time	throughput
17	approximate percentage of earth coverage of a geostationary satellite at zero degree elevation	42.5%
18	very early standard that defines binary digits as space/mark line conditions and voltage levels	V.1
19	required minimum power output of an international AM BC stations	50 kW
20	one of the first satellite system catering personal based communications services scheduled for operation	Iridium system
21	propagation condition is usually indicated when a VHF signal is received from a station over 5000 miles away	tropospheric ducting
22	signal to noise ratio that is required for a satisfactory television reception	40dB
23	emission F3F	television
24	single booster installed on the antenna dish of satellite receiver	low noise amplifier
25	noise generated that primarily determines the signal-to-noise ratio in a VHF (150MHz) marine-band receiver	in the receiver front end
26	latest government regulation in the telecommunication which provides policy for the provision of local exchange carrier service	E.O. 109
27	frequency tolerance of an AM radio broadcast station	20 Hz
28	basic mode of transmission system in the public data network in which data are transferred from the source to the network and from the network to the destination in the frame format	Packet Mode
29	type of beam antenna which uses two or more straight elements arranged in line with each other	Yagi Antenna
30	used to connect non-ISDN equipment to ISDN line	Terminal Adapters
31	executive branch of government in charge of policy making in the telecommunications	Department of Transportation and Communications
32	forward link channel	pilot channel
33	phase reversal keying	binary phase
34	each point on a spherical wavefront may be considered a source of secondary spherical wavefronts	Huygen’s Principle
35	term used to describe a spread spectrum communications system where the center frequency of a conventional carrier is altered many times per second in accordance with a pseudo-random list of channels	Frequency hopping
36	frequency bands can be refracted during the day by the D layer	both VLF and LF
37	considered the most frequently used transmission line	flexible coaxial line
38	height of an ionized layer is determined from the time interval between the transmitted signal and the ionospheric echo at vertical incidence	virtual height
39	optimum volume per person of rooms for speech	2.8
40	optimum reverberation time at 500 Hz for a cinema	0.8 to 1.2 sec
41	establishes the receiver bandwidth	IF amplifier
42	Flicker noise is a poorly understood form of noise which may be completely ignored about above ____	500 Hz
43	typical gain of a rhombic antenna	between 15 to 60
44	voice band channels in a superjumbogroup	10,800
45	illumination factor is normally considered in computing parabolic antenna gain in microwave communications	0.54
46	in acoustics, reference pressure in lb/ft2 unit	2.089
47	organization that published safety guidelines for the maximum limits of RF energy near the human body	American National Standards Institute (ANSI)
48	measuring a transmitter’s frequency against a suitable standard, the frequency to be	final RF stage
	measured is taken from the
49	ionosphere most ionized	midday
50	cellular radios use FM with a maximum deviation of ± ______	12 kHz
51	device that measures the angle between two radio frequencies and also the direction of propagation of a wave	goniometer
52	an automated ship-to-shore distress alerting system using satellites and advanced terrestrial communications systems	GMDSS
53	device that measures RF power by measuring the heat the rf power generates	Calorimeter
54	considered the most efficient mode in terms of energy transfer in waveguides	Dominant Mode
55	In acoustics, ______ is the apparent change in frequency or pitch when a sound source moves either toward or away from a listener	Doppler Effect
56	oxygen molecule absorption peaks to electromagnetic wave are at what wavelengths	5 mm and 2.5 mm
57	in cellular system, the _____ defines the geographic distance that is required between cells using identical frequencies in order to avoid interference between the radio transmissions at these cells	distance-to-reuse ratio (D/R)
58	the ability of a mobile phone to change from one channel (frequency) to another	Frequency agility
59	in cellular system, the average lead time to install a new base station is approximately ____ months to a year	6
60	at one atmospheric pressure, what is the approximate speed of sound in steel	5150 m/s
61	noise observable up to 8 MHz	space noise
62	in the American standard, the aural transmitter maximum radiated power is ____ of peak visual transmitter power	20 %
63	end impedance of half-wave dipole	2500 Ω
64	standardized as part of GSM phase 2+ that can offer theoretical data speeds up to 115 kbit/s	GPRS
65	channel number of an FM station with a carrier frequency of 99.5 MHz	258
66	comparing the capacities of a DVD and an ordinary CD, DVD is ____ times bigger than CD	15
67	waveguide passive component that brings a smooth change in the direction of axis maintained perpendicular to the plane of polarization	h bend
68	a low frequency audible periodic variation in pitch of sound output in high fidelity sound reproduction system	Wow
69	_____ is a term in the test language for noise testing in telephone circuits that means a one-syllable word consisting of a consonant, a vowel, and another consonant	Logatom
70	why are frequency modulation transmitters more efficient	Because their power is increased by class C amplifiers
71	not an ITU sector	ITU-W
72	a component that samples the microwave signal traveling in one direction down to the transmission line	Directional coupler
73	signal-to-noise ratio is required for satisfactory television reception	40 dB
74	telephone channels in AT 2 line	96
75	maximum power that can be obtained from a microwave tube at 10 GHz	10 W
76	circuit detects frequency modulated signal	Discriminator
77	form of regenerative repeater for transmitting signals over a long cable received through a relay in a clearer form	Interpolator
78	particular wavelength is solar flux measured	10.7 cm band
79	enhancement of GSM including the GPRS	2.5G
80	In television, sync-pulse is ____ IRE	40
81	base-to-mobile frequency assignment of a GSM system	935-960 MHz
82	bits of PREAMBLE in Ethernet frame	56
83	frequency used in communicating for submerged submarines	100 Hz
84	frequency range of radio altimeter	4240 to 4350 MHz
85	used for high definition video and data storage	blu-ray
86	fiber number of multi-core fiber colored white and black	18
87	camera tubes uses lead oxide (PbO) for the photoconductive target plate	plumbicon
88	in accordance with the ITU specifications, the cutoff wavelength of a single-mode fiber is from ____ to _____	1100,1280
89	RS232C uses ____ circuits for protocol handshaking	9
90	standard adopted by the grand alliance in digital broadcasting for multi-channel audio source encoding in America	Dolby standard AC-3
91	the cable type used in CCTV that has a maximum run-length of 250 meters	URM-70
92	lossy real impedance	resistance
93	typical diameter of an external diameter direct burial fiber cable	14.8 mm
94	latitude of international space station	350 km
95	bluetooth	piconet
96	shotckky??? diode or ____ diode	hot carrier
97	decimetric wave	space wave
98	cryptographic	cryptomeria ciper
99	commercial load for TV	18 mins per hour
100	in a single sideband suppressed carrier, what is the maximum instantaneous peak power if PEP is 50 W	10 W
101	cleaving is a process of _____ connecting two fibers	cutting an end fiber in preparation to

Complete List of Communications Engineering Coaching Materials

Communications Engineering Coaching Materials

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