Communications Engineering Coaching Materials: Section 5 Module 15

This is the Section 5 Module 15 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 15

#	Questions	Answers
1	One synch bit for every after 7bits	invert-on-zero
2	Bluetooth	802.15
3	Bluetooth throughput	723 kbps
4	Bluetooth uses what multiple access	spread spectrum
5	SPADE uses	QPSK
6	Fast Ethernet 10 Mbps uses	Manchester Coding
7	Not 3G	TD/CDMA
8	3G October 2000	CDMA2000 1X
9	IPS Radio and Satellite System Australia	T index
10	Try to send at baseband network cable	contention
11	Sending at baseband network cable	collision
12	Satellite 10-100 kg	Microsat
13	Spacecraft problem	Satellite Anomaly
14	Satellite actual user information	Satellite Payload
15	Commonly used has lesser number of bit than not commonly used	Huffman Code
16	AM uses	nonlinear devices
17	ITU designation J	SSBSC(Single Sideband Suppressed Carrier)
18	WIFI with broadband data rate	EDGE
19	Broadband data rate	2 Mbps
20	Telephone current	20 – 80 mA
21	Telephone ring	90 V, 20 kHz
22	WIFI	802.11b
23	2 or more antennas at same frequency	Space diversity
24	Type of diversity same as space diversity with two antennas	Polarization
25	Backup for 11 or more	Diversity Protection
26	Designated backup for each	Hot-Standby Protection
27	SRRS planning	12.5 kHz
28	Terrestrial Digital TV	32.28 Mbps
29	DVD laser diodes wavelength	650 nm
30	Prime meridian	ITU
31	Highly elliptical orbit	Molniya of Russia
32	Vertical and horizontally polarized but unequal magnitudes	elliptical
33	T1 interleaving method	Word Interleaving
34	E1 uses frame alignment bit rate	28 kbps
35	Capture range for 0 deg. Elevation	42.5 %
36	Facsimile	Photodetector
37	Fiber optic light source with narrow emission	ILD (Injection Laser Diodes)
38	Naturalness	80 – 8000 Hz
39	Monoaural	160 – 8000 Hz
40	Useful information capacity	throughput
41	Binary 6 zero coding	T2
42	First Philippine Satellite launched	Aug. 19, 1997
43	MP2 to HDTV ratio	55 to 1
44	Microwave repeater angle should be set to	small
45	Using fundamentals of light	Photonics
46	Plastic cladding, glass core	PCS
47	Measuring of band of sound pressure level	All of the above
48	Advantages of SSB AM to AM	All of the above
49	The relation of index of refraction of core and clad	index of refraction of core is greater than clad
50	Sideband power comes from	modulating amplifier
51	Class of FM with antenna 500 in height	Class B
52	Mobile phones with GPRS and GSM functions but manually interchanged	Class C
53	Natural Sampling do not use	Sample and Hold Circuit
54	Spectral splitting due to strong magnetic fields	Zeeman Effect
55	Waveguide, superposition of two planar waves	mode
56	Provides ITU all over the world	GPS
57	3GSM	3GPP
58	Voice frequency transmission disadvantage	Interference
59	QAM disadvantage	incompatibility with receivers
60	Bad frames are detected by	link layer
61	Parallel resonant LC circuit	Input impedance
62	Downtime / (downtime + uptime)	unavailability parameter
63	CSMA / CD	to detect collisions
64	Most important Parameter of uWave Systems	C/N
65	Reflective upper atmosphere	Heaviside-Kennelly
66	Square of period is proportional to cube of distance	harmonic law
67	AM double sideband designation	A
68	High velocity of rotating video heads	to increase write speed
69	Image frequency	frequency is added below and above the local oscillator which is equal to intermediate frequency
70	Padders on receivers	to improve tracking
71	Flicker noise	greater at low frequency
72	Granular noise happens	when the signal does not change
73	Base station/Cell site to mobile unit	forward link
74	Test for intelligibility	Articulation test
75	Percent of correct syllables	articulation efficiency
76	Percentage to be considered in articulation test to be 100 % intelligent	80 %
77	Analog mobile comm. Fastest data rate	AMPS
78	Square wave harmonics	odd
79	8PSK has degrees separation	45 degrees
80	Hard-to-get stations	Dxing
81	100% modulation, RF amp voltage	4 times voltage
82	Sound is 0.5 of power compared to picture	to minimize interference
83	VLF antenna is impractical	miles in length
84	Mysterious radio wave propagation that occurs in the equator at minimum sunspot	transequatorial
85	FM modulation index	increases with phase deviation, decreases with modulation frequency
86	EHF	millimetric waves
87	Antenna parameters interchangeable between antenna and receiver	reciprocity principle
88	Back porch	5.9 microseconds
89	Measuring absorption coefficient	impedance tube matching
90	Space diversity domain	vertical domain
91	Deriving FM from PM	integrate the PM wave before modulation
92	Considered as loss in transmission systems	fade margin
93	The difference between driver and terminator	noise margin
94	Depends on the direction of magnetic field not on its magnitude	Alfven wave
95	Near region	one wavelength
96	Superframes consist of how many frames	12
97	Magnetic field intensity at equator	32,000nT
98	Category of isdn digital service which is additional services	Supplementary
99	Transmission planning which is approaching to a zero transmission loss	via net pulse
100	Pulse “Blanked” out and is invisible in the receiver	blanking pulse

Complete List of Communications Engineering Coaching Materials

Communications Engineering Coaching Materials

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