Communications Engineering Coaching Materials: Section 1 Module 12

This is the Section 1 Module 12 of the compiled Communications Coaching Materials taken from different sources including but not limited to Communications books, past Board Exams Questions, Journals and the Internet.

Communications Coaching Materials: Section 1 Module 12

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

2x1.06x10 -19 coulombs

electron is a subatomic particle belongs to the lepton family has a rest mass of ___

9.1066x10 -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


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