EST Quiz Bowl

8/11/2019 EST Quiz Bowl

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EASY ROUND


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1. Alexander Graham Bell is known for the

evolution of telegraph to telephone. Speaking

through the instrument to his assistant in the

next room, Bell utters the famous first words,

Mr. _____, come here, I want to see you. What

was the name of his assistant ?


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Thomas Watson


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2. It is a form of amplitude modulation in which

the carrier has been cancelled out with the

balanced modulator and one of the sidebands

has been removed by using filter, phase-shift or

weaver method.


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Single Sideband

Modulation


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3. In optics, it is a dimensionless number that

characterizes the range of angles over which the

system can accept or emit light.


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Numerical Aperture


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4. For a PM modulator with deviation sensitivity

of 0.75 rad/V, carrier frequency of 500 kHz, and

modulating signal vm= 2sin(2kt), determine the

modulation index.


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1.5


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5. The most common method used for sampling

voice signals in PCM systems is flat-top

sampling, which is accomplished by what

circuit?


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Sample-and-hold


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6. It is a receiver parameter that is used to

measure the ability of the receiver to accept a

given band of frequencies and reject all others.


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Selectivity


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7. Determine the minimum bandwidth for a

binary FSK signal with a mark frequency of 49

kHz, a space frequency of 51 kHz, and an input

bit rate of 2 kbps.


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6 kHz


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8. Determine the equivalent noise temperature

for a noise figure of 6 dB.


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870 K


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9. A network topology which is a multipoint data

communications network where all stations are

interconnected in tandem (series) to form a

closed loop or circle. It is sometimes called aloop.


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Ring Topology


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10. It is a highly theoretical study of the efficient

use of bandwidth to propagate information

through electronic communications system. It

can be used to determine the informationcapacity of the system.


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Information Theory


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Moderate Round


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1. For a given length of RG 8A/U coaxial cable

with a distributed capacitance C=96.6 pF/m, a

distributed inductance L=241.56 nH/m, and a

relative dielectric constant of 2.1, determine thevelocity factor.


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0.69


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Piezoelectric


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Local Loop


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4. It is the first fixed-length character code. It is a

5 bit character code, with a start bit and a 1.5

stop bits.


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Morse Code


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5. It is a circuit in which the carrier is varied in

such a way that its instantaneous phase is

proportional to the integral of the modulating

signal.


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Frequency

Modulator


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6. It occurs when the medium is moving in the

opposite direction to the wave, or it can arise in

a stationary medium as a result of interference

between two waves traveling in oppositedirections.


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Standing Wave


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7. It is a virtual private network (VPN) security

that provides a strong barrier between the

private network and the Internet.


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Firewall


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8. If the refractive index of the core of an optic

fiber was 1.47 and that of the cladding was

1.44,the cone of acceptance would have an

angle of ?


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34.37 degrees


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9. It is a control system that generates an output

signal whose phase is related to the phase of an

input signal.


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Phase-Locked Loop


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10. It is the quality of the electric field at any

given point in volt per meter or a potential of 1

volt induced in an antenna wire 1 meter long


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HARD ROUND


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1. It is the highest point of the orbit, or the point

in an earth satellite orbit which is the farthest

away from the earth.


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2. A facility made up of international

transmission, switching and network

management facilities, which serves as point of

entry and exit in the Philippines of internationaltraffic between the national backbone network

and points outside the Philippines?


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International

Gateway Facility


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3. It states that every point on a given spherical

wavefront may be regarded as a source of waves

from which further waves are radiated outward


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HuygensPrinciple


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4. A polar impedance diagram, which consists of

two sets of circles, or arcs of circles, which are

so arranged that various important quantities

connected with mismatched transmission linesmay b plotted an evaluated fairly easily.


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Smith Chart


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5. It is an interface between the DTE (Data

Terminal Equipment) and DCE (Data

Communications Equipment) employing serial

binary data interchange


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RS232C


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6. It is the result of sustained oscillations due to

positive feedback in telephone amplifiers or

amplifying circuits.


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Singing


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7. It is a common type of FM detector circuit,

invented in 1936. The circuit was envisioned for

automatic frequency control of receivers, but

also found application in demodulating an FMsignal. It uses a tuned RF transformer to convert

frequency changes into amplitude changes.


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Foster-Seeley

Discriminator


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8. For an AM broadcast-band superheterodyne

receiver with IF, RF, and local oscillator

frequencies of 455 kHz, 600 kHz, and 1055 kHz,

respectively, determine the image frequencyrejection ratio.


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211.3


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9. It is a communications satellite launched in

1997. It originally provides telecommunications

services for the Mabuhay Philippines Satellite

Corporation before being sold to ABS in 2009. Itwas the first Filipino space satellite.


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Agila 2


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10. A radio communication link is to be

established via the ionosphere. The maximum

virtual height of the layer is 100km at the mid

point of the path and the critical frequency is 2MHz. The distance between the stations is

600kms. Determine the suitable value for the

optimum working frequency.


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5.37 MHz

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