Communications Engineering Coaching Materials: Section 5 Module 3

This is the Section 5 Module 3 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 3

#	Questions	Answers
1	What is the distance of density diminishes per gravity distance?	Inverse square law
2	sensitivity	IF amplifier
3	The channel of TV cable frequency range of 5.75MHz-11.75MHz	T1
4	Mechanical splice attenuation loss is	0.1
5	The velocity of sound is considered to be constant at	330 m/s
6	Commonly used telephone wire	AWG #19
7	A low loss dielectric material is used to cover a dish	Radome
8	What is the highest frequency that can be sent straight upward and return?	critical frequency
9	NAM stands for?	Numeric assignment module
10	RF stage preceeds a superhet reciever ,1 advantage of a good RF stage is	Better rejection ratio
11	What is the input impedance of a quarter wave length shorted stub?	Maximum impedance
12	The maximum power output of subscriber	1mW
13	The medium frequency band	0.3-3MHz
14	The acoustics of most auditoriums when the room is full	different
15	Any device to be used as a frequency multiplier	non linear
16	What is a continuous impulse with spikes with short duration with high amplitudes?	jitter
17	What is the traffic model?	Erlang B
18	Independent side band	B8E
19	The advantage of a cable communication system over a broadcast system	higher capacity
20	What happens in a capacitor is added in series in an antenna?	It increases the antennas resonate frequency
21	Refers to the relative refractive index	0.1-0.3 %
22	What is the most commonly used intermediate frequency of radar receivers?	30MHz
23	Not more than___ digits make up an international telephone number as amended by CCITT	12
24	Twists in twisted wire pairs	Produce electromagnetic interference
25	What is made by the term ?????????????????????	The frequency range over which is expected to perform well
26	Area of earth the covered by a satellite radio beam	footprint
27	Speaking of antenna, __ is a section of antenna in which would be a complete antenna by itself	bay
28	Is the process by which a customer maybe accepted with the absence of establish interference standards that corresponds to the specifications	type acceptance
29	What is the horizontal angle?	azimuth
30	In the TV system is a measure of ability to tell the lining picture	resolution
31	KBP radio code handles the station provides a minimum of ____ commercial	45 minutes
32	Which of the following is the basic component for satellite receiver?	transponder
33	In radio communication the term trap antenna is referred to one of the following statements	Antenna which can be used more than 1 band due to the use of power in LC networks
34	The current maximum in a marconni antenna is found at ____	The base of the antenna
35	The antenna effective height is _ to _ actual height	½ to 2/3
36	A computer terminal that will program the perform function	Intelligent terminal
37	The most commonly used Transmission Line in TV system	coaxial cable
38	What type of emission is produced when a frequency modulated is modulated on TV signal?	F3F
39	What causes quantization in a PCM system?	The approximation of quantized signal
40	With lights not polish into fiber it produces a loss of	4%
41	Frequency division is useful to implementation of a ____	Frequency synthesizer
42	An advantage of FM over AM	Signal to noise improvement
43	Characters that must be transmitted other than data	Overhead
44	What is used in antenna in order to increase it effective height?	Top Loading
45	Which modulation methods are the most widely used?	Intensity modulation with polarization modulation
46	If the diameter of conductors are two wire Transmission Line	Decrease the impedance
47	Is the aural monochrome television broadcast channel?	4.5 MHz
48	sound generating Modulating waveform for FM will cause a greater ____	Frequency Deviation
49	The modulation index of an AM is changed from 0 to 1 the transmitted power is	Increased by 50%
50	What will happen in a quarter wave Transmission Line is opened?	Behaves as a series short circuit
51	Every time the telephone is answered the handset is of the _ state	On hook state
52	Most fiber optic light sources emit light in which spectrum	infrared
53	Lightning rods mounted at top of structure	30cm
54	What particular stage does frequency provides fidelity?	audio stage
55	Which of the following is not a common light detector	photovoltaic
56	The Gunn diode oscillator	Depends on the formation of charge
57	Creators shall require to provide local exchange service	3
58	Which major element has super heterodyne receiver must be nonlinear?	mixer
59	The SWR is infinite	purely reactive
60	The most commonly used filter SSB generators uses ____	crystals
61	Klystron oscillators frequency range of _____	3000-30000MHz
62	Shortening effect	end effect
63	What is the average insertion loss of fusion splice in Fiber Optic Cable?	0.09 dB
64	Which of the reception problem that is not multipath?	slow fading
65		mush
66	it is a protocol used to connect the other packets	X.75
67	What is the power loss of a telephone hybrid?	3 dB
68	index multimode optical	0.05
69	What is a measure of reliability express as an average number?	MTBF
70	Term that refers to the numerical range which relates the performance of one antenna to theoretical antenna	Antenna Gain
71	What is the gateway telecommunications T2?	6.312 Mbps
72	High speed LANs data rate	50-150Mbps
73	rainfall is an important factor of frequency above ____	10GHz
74	What is the basis of the first generation wireless?	Analogue cellular technology
75	When microwave signals follow the curvature of the earth?	ducting
76	quantizing noise occurs in ____	PCM
77	What network provides the greatest?	Pi-L
78	What type of signal selectivity?	SSB voice
79	What circuit is used to detect frequency modulated signal?	Discriminator
80	Number of voice transmission that can be ?????????????????	4
81	popular line wavelength Fiber Optic Cable	1.3 micrometer
82	Which is the simplest effective in changing?	Semiconductor
83	are used in all communication system when propagation time exceeds ___	50 milliseconds
84	Which stands for dB relative?	dBr
85	atmospheric attenuation	Water vapor and oxygen
86	minimum propagation delay of geo satellite	– 239ms
87	cable consists of twisted pairs of conductors, each separately insulated	Quad
88	stereophonic FM	30 -53 KHz
89	signal to noise ratio required for satisfactory TV reception	40 dB
90	Start of test for BISYNC	STX
91	Short bit sequence 128 bits	hash
92	rules and description binary	V.1
93	affected by the distance	loudness
94	information about satellite send to earth	TTC
95	if away from source	plane wave
96	measures speed	doppler’s effect
97	measures virtual height of ionosphere	ionosonde
98	sound travels fastest at	solid

Complete List of Communications Engineering Coaching Materials

Communications Engineering Coaching Materials

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