Communications Engineering Coaching Materials: Section 5 Module 13

This is the Section 5 Module 13 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 13

#	Questions	Answers
1	T-1 carrier service has ___digital bit rate	1.544 Mbps
2	The most widely used microwave antenna is a	Horn antenna
3	The wavelength of visible light extends from	400 – 750nm
4	In FM fax, the frequency for black and white are ____ respectively	1500 and 2300 Hz
5	Which of the following is used to measure SWR	Reflectometer
6	What causes splatter interference	Overmodulation
7	A certification issued by the NTC for SRRS radio equipment complying to the SRRS technical standards and specifications, where equipment has already been type approved by the administration whose certification is acceptable and whose process does not require laboratory testing	Type Acceptance certification
8	Using the TE mode, microwave power can only be transmitted in free rectangular guide provided	the wide dimension is greater than one-half of the wavelength in free space
9	Velocity factor of coaxial cables vary from	0.6 to 0.8
10	Refers to the local exchange service area where the telephone density is 1 per 100 inhabitants and shall be based on the telephone density target from the approved National Telephone Development Plan (NTDP), expressed as main station per 100 persons	urban
11	____ theory is deciding between a set of hypotheses when given a collection of imperfect measurements	Estimation
12	What type of connector arrangement where in a costumer may move to another location and still retain the same telephone number	TPS
13	Propagation of electromagnetic waves often called radio-frequency [RF] propagation or simply radio propagation	Free space optics
14	The planned European Satellite Navigation System known as Galileo has ___ no. of constellation satellites	30
15	The most commonly used LNA in satellite transponder is ___ diode	Tunnel
16	It suggests that there is more than one transmission path or method of transmission available a transmitter and a receiver	Diversity
17	The IF bandwidth of a radar receiver is inversely proportional to	Pulse width
18	The chrominance processing circuits can be deactivated when monochrome broadcasts are received by the __	Color killer
19	Which of the following is the color video signal with bandwidth of 1.3 MHz?	I
20	What is the broadcast frequency band used in short-wave broadcasting reception?	HF
21	a source of internal noise	Thermal agitation
22	_____ is an antenna array which is highly directional at right angles to the plane of the array?	Broadside array
23	What is the effect if the gain level being too high for signals entering the modulator?	Distortion and splatter
24	Demodulation of the audio signal is done by the ___	Discriminator
25	For class B-1 FM broadcast stations, the maximum ERP allowed is __ kw with an antenna height limited to __ feet above average terrain	5, 200
26	Infrared technology is used to implement wireless LANs as well as the wireless interface to connect laptops and other portable machines to desktop computer equipped with an infrared transceiver. What wavelength band is used by the typical infrared LANs?	750 and 950 nm
27	The ITU-T recommendation for error detection and correction for asynchronous transmission	V.42
28	A mode that exists in fiber optics when the magnetic field is perpendicular to the direction of propagation but there is a small component of electric field in this direction	TM mode
29	The perigee of the international space station	349km
30	A traditional cable TV channel that belongs to FM band	A-5
31	The three major types of demodulators	Foster-Seely, Quadrature, PLL
32	Most common IF carrier frequency	70Mhz
33	In microwave communication, what concepts may be used to analyze interference by obstacles near the path of a radio beam?	Fresnel zone
34	Rayleigh Scaterring Loss at 8020 nm has a typical value of ___	2.5dB
35	The data rate of information transfer of mobile devices using “Bluetooth”	1 Mbps
36	How many octaves is the frequency range 1 to 8 Mhz?	3
37	In accordance with existing provision of law and the KBP rules and regulations, all station shall actively promote the growth and the development of Filipino music by playing ___ every 4 hours	16
38	Precise scanning and linearity are most important in	single-tube color
39	Which of the following is false?	A fully saturated color is mostly white
40	In an FM-phone signal, what is the term for the maximum deviation from the carrier frequency divided by the maximum audio modulating frequency?	Deviation ratio
41	Snow in a TV picture is a result of	Random noise
42	Time to travel one nautical mile	6.18microseconds
43	microchip that attach of the antenna	Radio frequency identification tag
44	balls that is attach to the antenna wings	To provide corona discharge
45	24 Galileo satellite	4 simultaneous receiver
46	PSK or QAM modulation in fax	Group 3
47	time to transmit 81/2 X 11 in fax	2 minutes
48	advantage of heterodynes	To have high sensitivity and selectivity
49	D.O. 88	Radio station construction permit
50	D.O. 88, DMPST	Amateur, paging in UHF or VHF band
51	paging in cellular	To inform calling from other mobile
52	optical fiber	Maximum distance between repeaters
53	fresnel reflection in optical fiber loss	Return loss
54	where will the loading coil be put	Near the center of vertical reflector
55	resistance loss in glass	292 ohms
56	NTC allocated frequency, as of November	Telemetry
57	stripping effect	Leaky mode
58	maximum bend of a optical fiber	7.5m
59	reverse transmission direction	Line turn around
60	called a fishing rod	Small rod supports the microphone
61	when in crowded or noisy place, it is better to use two ears than covering one	Cocktail party
62	translate ACII, 9,600 bit/ sec	9,600 word/min
63	ILS system	An instrument in aircraft provides two separation
64	spread spectrum fee per 1MHz	P500,000
65	wavelength of infrared	780-950 nm
66	ratio of dummy	1:1
67	allotted for rural	1000 Hz
68	channel 11	211.25
69	channel 44	651.25
70	frequency in ship and coastal	500
71	provides number of new computer	Computer telephone integrator
72	steerable parabolic antenna	Radar lock
73	minimum gain of channel 13	22dB
74	separation in 2GHz	90cm
75	horizontal resolution of broadcasting	428
76	spread spectrum increment	30Hz
77	sonnet sts-I	51.84
78	transfer from laptop to workplace	Cellular digital packet data
79	intensity of sound per 1000Hz	0.0001 picowatts
80	in the IRR, radio transmitter in maritime general calling should observe	Radio silence during silent period
81	optical fiber range from approximately one times ten raised to __ to one times ten raised to __	14, 15
82	resolution of the picture color tv	Frequency response of the video
83	form of single sideband emission when carrier are suppressed	Reduced carrier single band emission
84	three dimension turn to one direction	Waveguide
85	asynchronous bit timing	Syncopated
86	channel 7	178.83
87	electronic method to oppose unwanted noise	Active noise control
88	ITU	Has larger bandwidth and …
89	Referred as a break in optical fiber	Cleave
90	Marconi beacon	75Mhz
91	Bluetooth can support ___ simultaneously in 10m radius	8
92	Travel time in 5km distance	10 minutes
93	Purpose of AFC in FM	To maintain oscillator frequency
94	uses low frequency	OMEGA
95	discriminator as a second detector	Doppler
96	data link layer	To establish and maintain link
97	Multiple sources each converted to a same frequency	TDM
98	Automatic moving of antenna	smart antenna
99	access method in Ethernet	CSMA/CD
100	The OSI layer that manage traffic on the link	Data link layer

Complete List of Communications Engineering Coaching Materials

Communications Engineering Coaching Materials

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