Communications Engineering Coaching Materials: Section 1 Module 12

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This is the Section 1 Module 12 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 12

QUESTIONS	ANSWERS
Programming of a continuous-path robot is normally carried out by a method called ___ through	walk
What is the carrier frequency of the supergroup 10?	3100 kHz
A satellite was launched with a speed of 25000 miles per hour and… breaks away with the gravitational pull of the earth and not in orbit…deep space?	Space probe
What to consider in choosing a primary cell	cost, life, ease of replacement, voltage and current needs
What is the minimum modulating frequency of FM?	20 Hz
What is the voltage for the local-loop on-hook?	-48Vdc
What is another term for thermoelectric effect?	Seebeck effect
Class of amplifier usually employed in driver stage?	Class A
What is the process of interaction or interconversion between electric and chemical formula?	Electrochemistry
The mandatory 1910 to 1912 ship-to-shore communication were established by US, Great Britain… as a result of the sinking of two famous ships, What are these two ships?	Republic and Titanic
Cable used in 100Mbps Ethernet	UTP category 5
No. of subscribers that can be served by cellular telephone with 5 radio channel	100
Carrier frequency for CATV above the lower frequency limit	1.25Mhz + 25kHz
Permit fee in establishing CATV head end	900
Subatomic particle that has no rest mass and travels in speed of light	neutrino
What is the reason why splices are better than connectors	because splices have no air gaps
leading p.f. the armature flux in an alternator ___ the rotor flux	aids
What is the operating temperature of a Class B motor	130 degree celsius
What is the operating temperature of a Class H motor	180 degree celsius
What is the operating temperature of a Class A motor	105 degree celsius
What is the operating temperature of a Class F motor	155 degree celsius
__ milliroentgen per hour is the allowable exposure to radiation	0.5
Maximun power of class III analog cellular phone	3W
ITU standard for video conferencing in telephone line	H.261
who propose the idea subatomic to atom manipulation	Richard Feynman
type of convergence adjust at the back of TV magnetic ring	static convergence
one diode rectifier is connected with a voltage doubler	voltage tripler
The secret code w/c secures and defends sensitive information that crosses over public channels…	electronic key
height of the GPS satellite orbit in nautical mile	10898
what is meant by GMDSS	Global Maritime Distress and Safety System
What is the disadvantage of conventional full wave rectifier…?	peak voltage is half of that half wave rectifier
…discovered transistor in…	Bardeen and Brattain
…op-amps with negative feedback, reduced voltage works as a ___	linear amplifier
…hot wire ammeter measures____ of current output of a full wave rectifier	0.707
…decrease in thermal noise power…	decrease in BW and temperature in circuits
what part of the visible radio spectrum does camera tube has greater output?	yellow green
instrument used in measuring large energy radiation	posimeter
loudness level that can cause hearing damage	150dB
a point in line between center of the earth and the observer farther from the earths center	Nadir
what is required in small network in connecting computer directly through terminals not by hub	crossover cable
method in manufacturing IC in which the element penetrates the substrate	diffusion method
hold atoms in a crystal	covalent bond
mechanical power output of dc motor is equal to __	back emf x armature current
common use of anthropomorphic type of robot arm	spray paint
pair of metals used as good electrodes in wet cell battery	zinc and copper
instrument w/c uses magnetic field from fixed and moving coils to measure voltage, current and power	electrodynamometer
bytes w/c computer will calculate in 2050 according to Moore’s law	500 Trillion
no. of protons in oxygen atom	8
standard cell w/c is 0.005% less accurate	Welton unsaturated cell
in class C amplifier, the power output increases _____	if conduction angle increases
process used to prevent the meter needle to overshoot the current reading	damping
simplest type of motor controller	toggle switch
generate triangular waves, square waves	nonsinusoidal wave generator
what is another term for magnetic amplifier	low frequency amplifier
…meter pointer of PMMC instrument uniform…	because it is spring controlled
used to locate conductor cable in cross connection type	varley loop
generating static electricity	electrophorous
metal semiconductor junction made of aluminum and n-type silicon	schottky diode
purpose of adding inductor to the amplifier	high frequency compensation
standard programming language of US Defense Dept. similar to Pascal	ADA
irregular termination of call to the total number of call	drop call rate
velocity factor of coax cable	0.6 to 0.8
time of orbiting in GPS constellation	12H
minimum number of segments used to display any number	7
similar to the operation of control of water in the hose	JFET
user guide to open www pages	browser
reciprocal of wavelength	wave number
difference in the primaries of ac and dc	primary excitation
Opamps characteristic	short circuit protection, no latch up, input-offset nulling
electric shock and electric therapy will pass current to what part of the body	brain
the reciprocal of the atomic mass units in gram	avogadro’s number
What determines the identity of the element?	atomic number
What is usually the range of value in choosing choke?	from 1 to 20 Henrys
in CATV, what terminal isolation is provided to each subscriber	28dB
Time Division Duplexing (TDD) is the transmission signal format be cordless telephone-2 (CT) dubbed as ___	portable payphone booth
The transformer connected in a special way, to connect balance and unbalanced or vice versa, and provide impedance matching….	balun
what is a popular fiber optic cable, with glass core and plastic cladding	Plastic Clad Silica (PCS)
the disadvantage of plastic core in fiber optic	high attenuation
the disadvantage of glass core in fiber optic	brittle
what are four basic types of secondary cell	lead-acid, nickel cadmium, silver-zinc, silver-cadmium
What element is MOSFET isolated from the channel material?	gate terminal
An industrial robot is…	multi-functional, servo-controlled, programmable
What is an electronic oscillator?	it is an amplifier with feedback
What is commonly used in heart pacemaker?	lithium cell
What interface standard is used in connecting a printer to a computer?	centronics interface
general purpose op-amp	LM101A
What E.O. … vesting jurisdiction…for the Philippine Communication Satellite?	E.O. 196
used to measure the permeability of a ferromagnetic material	permeameter
what circuit can be active or passive (w/ capacitor, resistor, and inductor)	balanced circuit
serve as a rectifier in motors	commutator
motor connected in parallel will share the load according to ___	motor rating
speed of AC motor depends in its___	load
data transfer of GPRS	above 170kbps
What instrument uses lux as its unit?	light meter
typical output power of reflex klystron	100mW
charge of alpha particles	2×1.06×10 -19 coulombs
electron is a subatomic particle belongs to the lepton family has a rest mass of ___	9.1066×10 -28 grams
What is the characteristic of thermoplastic?	it soften when heated
180 degrees out of phase with red	cyan
Replacement to LC tuned circuit… in UHF…	transmission lines
Damage to the reproductive tissue caused by UV..	Genetics
damage to tissue not only to reproductive tissue	somatic
earliest form of micro module	cordwood module
silicon transducer temperature	100 to 200 degrees celsius
transferring of information to active computer to computer	back talk
several disk comprises of disk or hard drive	platters
coating thickness of 0.0001 cm	thick film
how thick film is developed	by screening
frequency that has the highest noise factor in transistor	DC
in CATV, the sound signal attenuation	13-17dB
After the effectivity of RA9292, for registered ECE may apply for PECE at least how many years?	7
not using TDMA multiplexing	IS-95
for the development of voltage control	acquisition phase lock
internet access, 6MHz TV bandwidth data rates	27Mbps
antenna which is direct connecting to waveguide	horn and slot antenna
maximum sound pressure level that can be allowed to be heard	120dB
measurement of the virtual height of the ionosphere	ionosonde
CATV noise figure	6dB or better
inspection fee for CATV head-end station	300
IMT-2000 maximum rate for mobile services	144kbps
selective signalling where low frequency trigger the squelch circuit	continuous tone control
science that measure the entire electromagnetic spectrum	radiometry
height of antenna for CB radio	60ft above ground or 20 ft. above bldg.
instrument used to measure oxygen in blood	oxymeter
also known as geographical north	true north
alkaline battery	1.5V
chairman of NTC	Ronald Olivar Solis
low data rate compression used in Cd ROMs	MPEG-1
threshold of audibility	10 -12 W/m2
science of mechanical and electronics	mechatronics
process of firing a rocket by underground control to maintain and adjust the orbit	station keeping
permit fee for the import of cable TV equipment	100
commonly used gas for jet thrusters	hydrazine
used when VNL exceeds 2.5dB	echo suppressor
having one modem per computer and individual phone lines for each	modem pool

Complete List of Communications Engineering Coaching Materials

Communications Engineering Coaching Materials

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