Communications Engineering Coaching Materials: Section 1 Module 10

This is the Section 1 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 1 Module 10

ITEM	QUESTIONS	ANSWERS
1	Human hearing range in octaves	10
2	GPS satellite orbit period	12 hrs
3	GPS constellation radius	20,200 km
4	Advantage of discone	Broadband
5	The trouble when the color oscillator does not oscillate	No color
6	Term for ordinary telephone	POTS (plain old telephone system)
7	The beat frequency between the 3.58 MHz subcarrier and the 4.5 MHz sound signal	0.92 MHz
8	Final amplifier stage	Power amplifier
9	Threshold pain of acoustic shock	120 dB
10	EDGE enhanced GSM	358
11	Standard terrestrial TV transmission	8VSB
12	A call that cannot be completed	Blocked call
13	A vacuum tube used for microwave amplification and oscillation	Klystron
14	CATV level for sound interruption	40 dB
15	CATV is an ex. of Metropolitan area (?)	network
16	Radio system use to provide high speed data packet	GPRS
17	The law tat created the MTRCB	PD 1986
18	Vertical blanking considered as 3 horizontal lines wide	Vertical sync
19	System that does not use TDMA	IS 95
20	Accessory referred to as magic T	Hybrid T
21	For TV system, the horizontal flyback is 10%	6.4 micro seconds
22	Typical speech power of the human ear	10 to 1000 micro watts
23	When was the first mobile phone introduced	Oct 13, 1983
24	Number of HDTV horizontal lines	1125
25	Number of NTSC horizontal lines	525
26	Analog sampling rate (?)	PAM
27	Modulation technique that is noise resistant	PCM
28	Same as Polytetrafluoroethylene	Teflon
29	Coaxial cable insulator	PCV
30	Device located at the middle of a star topography	Hub
31	3 segments of GPS	Space segment, user segment, call(?)
32	WAN physical topography	Packet switching, leased line, circuit switching
33	In fiber optics, when electromagnetic waves scatter and are about equal or more than its wavelength	MIE scattering
34	Most significant part or stage of a launched satellite	Initial payload
35	What is a launched satellite that does not stay in the gravity of the earth and wanders in space	Space probe
36	Also acts as a high pass filter	Waveguide
37	Why is FM more efficient than AM?	Because FM uses class C amplifiers
38	What can achieve a maximum of 100% efficiency	Class C amplifier
39	What can achieve a maximum of 50% efficiency	Class B amplifier
40	Measures the entire electromagnetic wave spectrum	Radiometry
41	Divx (component? Similar format?)	MPEG4
42	When you get the code of a mobile & illegally use it in another mobile to make calls	Clone fraud
43	Why is sidetone necessary?	For the user to know if the telephone is working
44	Two data transmitted in different directions in different time intervals	Time division duplexing
45	Max power of class 3 analog mobile phones	3 Watts
46	Max power of class 2 analog mobile phones	600 milli watts
47	Presidential decree (?)	PD 2004
48	3G (?)	2001
49	When a mobile is simultaneously in the area of coverage/territory of to base stations	Soft handoff
50	Cost of building a base station	$500,000-$750,000
51	Exact frequency of color subcarrier signal (choose 1)	3.579545 MHz or (sadly) 3.579454 MHz
52	Uses lead oxide and has minimum lag	Plumbicon
53	In CATV internet, a 6MHz channel has a data rate of	27 MHz
54	Data rate of fiber optics	20 Gbps
55	AKA grounded antenna	Marconi antenna
56	Radiation pattern of the dipole antenna	Figure 8
57	Smallest block f data transmitted in a network	Packet
58	Time in a day that the human can be exposed to 110-120 dB	20 mins
59	Deafening level of sound for humans	120 dB
60	Navigation system used in ships, submarines, airplanes similar to radar	Inertial Navigation System (INS)
61	A kind of INS where in the sensor is mounted on the face of the ship for direction	Strap-down transducer
62	Multiple programs application run simultaneously without interference	Multitasking
	Multiple programs run without interference
63	2 ships that sank leading to the creation of (INS?)	Republic and Titanic
64	Computer network	Server-client, Peer-to-peer
65	Combination of 2 pts whose magnitudes are equal and opposite in polarity separated by a small space with that of which the filed of dipole that it determines	Electronics doublet
66	In a client-server network ,what LAN software makes sure that data on the server is being changed by one station and is not simultaneously read by another	Record Locking
67	What do you think is the main disadvantage of grid-over plate modulation	Lower power efficiency, difficult to adjust
68	What is another term for pink noise	Flicker noise
69	What refers to a telephone that rings another phone without dialing	Hot line
70	Damage to cells other than reproductive cells due to exposure to intense RF radiation is what	Somatic
71	What do you call the range over… the reference frequency can be… and still achieve phase lock?	Capture range
72	What deice are to be inserted in a telephone channel if the total via net loss of a given trunk circuit exceeds about 2.5db?	Echo Suppressors
73	What is the main advantage of fiber optic cables made of plastic?	Inexpensive and more flexible
74	What LAN topology is used by the classical Ethernet system	BUS topology
75	If a broadcast station is transmitting but not modulating, what is heard in a receiver tuned to its frequency?	Nothing

Complete List of Communications Engineering Coaching Materials

Communications Engineering Coaching Materials

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