Communications Engineering Coaching Materials: Section 5 Module 1

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This is the Section 5 Module 1 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 1

#	Questions	Answers
1	Amplitude modulation via Facsimile	A3C
2	Frequency modulation via Facsimile	F3C
3	What emission is F3C?	Facsimile
4	Troposcatter in Sky Wave Propagation occurs in what range of frequency	300 MHz to 3 GHz
5	Which of the following terrain types permits a ground wave to travel the farthest?	Salty
6	What of the following permits a microwave signal to travel in one direction with virtually no loss, but severely attenuates any signal attempting to travel in the reverse direction?	Isolator
7	Ferrite rod device that prevents the formation of reflected waves	Isolator
8	Advantage of Trap Antenna	It can be use in different antenna because of LC circuit
9	In Pulse Width Modulation,	pulse duration
10	varying pulses	pulse width modulation
11	Expose ground equipment should not exceed ____ Vrms	45
12	Typical earth factor	4/3
13	Directivity is	Proportional to Antenna gain
14	Current node in a half wave antenna is located	at the ends
15	Voltage node in a half wave antenna is located	at the feed
16	from zero modulation to 100% modulation,	Antenna current increases by 22.5 %
17	The standard reference antenna for a directive gain is	Isotropic Antenna
18	How much farther does the radio path horizon distance exceeds the geometric horizon?	Increases by about 15% of the length
19	Parasitic element	5% longer
20	use in aircraft	Frequency modulated continuous wave
21	Antenna use in ILS	folded dipole continuous wave
22	Why is nitrogen gas sometimes used in waveguide?	to keep the waveguide dry
23	Need for pressurizing cable with dry air	to prevent internal arcing
24	As electromagnetic travel in free space, only one if the following can happen to them	Attenuation
25	Which of the following is not a natural ways of radio wave may travel from transmitter to receiver?	Microwave
26	hollow conductor that carries RF	Waveguide
27	Telephone	13 kbps
28	In a ¾ wavelength shorted at end will have impedance	Infinite
29	What is major cause of atmospheric or static noise?	Thunderstorms
30	What signal to noise ratio is required for satisfactory telephone service?	50 dB
31	In SSB, carrier and the other sideband is being	cancel, filter
32	IBM	83B
33	folded dipole compared to simple dipole	longer
34	In CCITT’s FDM Hierarchy, number of channels in a master group	300
35	Power HF compared to UHF	100:20
36	The third symbol used for television transmission	F
37	A word in telegraphy consists of ___ characters plus a word space	7 and ½
38	VOR	108.1 to 117.95 MHz
39	Class D AM	12 Midnight to 5 AM
40	Trap antenna	can be use in wideband
41	What is the typical speech coding rate used for GSM?	13 kbps
42	D-AMPS	8 kbps
43	Difference between available power and power budget	Power Margin
44	Maximum number of break in a 60 minute show	7
45		2.5:1
46	Unmodulated carrier	0% modulation
47	Frequency band of U600	564-3084
48	What is the transmission rate of a T3 line?	44.736 Mbps
49	in telephone, maximum pulse per second	6
50	third symbol emission for telephone	E
51	Monochromatic	one color and one
52	Quality	Contrast
53	To couple energy into and out of a waveguide	use thin piece of wire as an antenna
54	A high standing wave ratio might be caused by	impedance mismatch
55	VHF received from 500 miles	tropospheric ducting
56	Oldest multiplexing scheme	Space Division Multiplexing
57	1st Active Satellite	Sputnik 1
58	1st Satellite to Transmit and Receive	Intelsat 1
59	Primetime block of TV	6 PM to 11 PM
60	Determine from the following radio frequency that falls under the very high frequency band of radio spectrum	235.50 MHz
61	Antenna power times the Antenna gain	Effective Radiated Power (ERP)
62	Antenna power times the Antenna gain relative to Isotropic antenna	Effective Isotropic Radiated Power (EIRP)
63	Factors	Antenna height, distance
64	It is the picture quality determined by the difference of the intensity between black and white parts of the picture	Contrast
65	Pilot tone	3000 Hz
66	GMA 7	High VHF
67	Amount of voltage induced in a wave by an EM wave	Proportional to Field Strength
68	Disadvantage of Trap antenna	It radiates harmonics
69	An instrument used to measure the relevant height, a layer in the ionosphere used for wave propagation	Ionosonde
70	Third symbol of emission designation using telephone (telephony) such as in sound broadcasting	E
71	Capacitor	Capacitor
72	Commonly used insulator	Mica
73	Distance to the station, DME	Slant distance
74	What phenomenon causes of longer radio path to exceed geometric horizon?	Refraction
75	Waveguide construction	should not have a long horizontal run
76	Loading coil is used in marconi	tuning out capacitance reactances
77	Last stage of GSM	EDGE
78	Bandwidth of fiber optics compared to cable	100 times
79	What causes the attenuation in waveguide?	losses in the conducting walls
80	Continuous tone generated by the combination of two frequencies of 350 Hz and 440 Hz used in telephone sets	Call Waiting tone
81	Pulse dialing rate	10 pulses/sec
82	What kind of receiver is used in conventional telephone handset?	Electromagnet
83	Characteristic impedance is dependent on	length
84	Velocity of sound	330 m/s
85	Time for the signal to travel	Propagation delay
86	How many voice band channels in a SPADE FDMA satellite system are PCM encoded before they separately modulate the assigned carrier?	800
87	AMPS operated in which cellular radio frequency?	800 MHz
88	Which of the following represents the best standing wave ratio?	1:1
89	The _____ of a sound is a subjective effect which is a function of the ear and brain	loudness
90	OMEGA measures	phase angle
91	LORAN	measures at larger distance
92	Radiation resistance	equivalent resistance that will dissipate the same amount
93	What antennas are suitable for direct connection to a waveguide?	Horn and slot antenna
94	What factors determines the EIRP required by a station in each operation?	Satellite antennas and height, Satellite receiver sensitivity
95	Ferrite beads	use in primary and secondary
96	aircracft radio altimeter	4250 MHz to 4350 MHz
97	end impedance of half-wave dipole	2500 ohms
98	aircraft VHF communication	118.00 MHz to 139.975 MHz
99	The bending of radio waves passing over the top of a mountain range that disperses a weak portion of the signal behind the mountain is	knife-edge diffraction
100	troposcatter	beyond 5000 km
101	Information about satellite send to earth	TTC

Complete List of Communications Engineering Coaching Materials

Communications Engineering Coaching Materials

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