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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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