Review

2ND ELIMINATION ROUND
August 30, 2016

The property of a substance which remains
constant if no heat enters or leaves the system,
while it does work or alters its volume, but
which increases or diminishes should a small
amount of heat enter or leave.
a. internal energy b. system
c. entropy d. enthalpy
General Engineering and Applied Science

The quantity of heat required to change the
temperature of unit mass through one degree.
a. Temperature b. Specific Heat
c. Thermal Equilibrium d. Calorie

“If the temperature of a given quantity of gas is
held constant, the volume of the gas varies
inversely with the absolute pressure during a
change of state”
a.General Gas Laws b. Joule’s Law
c. Charles’ Law d. Boyle’s Law

“When two bodies, isolated from other
environment, are in thermal equilibrium with a
third body, the two are in thermal equilibrium
with each other” is a statement of……..
a.1st Law of Thermodynamics
b. Zeroth Law
c.2nd Law of Thermodynamic
d. Maxwell’s Theory of Thermal Equilbrium

“Not all energy received as heat by a heat-
engine cycle can be converted into mechanical
work, some are also rejected” is a statement
of…….
a.1st Law of Thermodynamic s
b.Zeroth Law
c.2nd Law of Thermodynamics
d.Law of Conservation of Energy

The combined mass of car and passengers
travelling at 72 km/hr is 1500kg. Find the kinetic
energy of this combined mass.
a.300kJ
b.330kJ
c.305kJ
d. 310kJ

The energy stored in a substance by virtue of
the activity and configuration of its molecules
and of the vibration of the atoms within the
molecules.
a.Internal Energy b .Heat
c. Enthalpy d.Entropy

In pulse-code modulation, it translates
the quantized samples into digital code
words.
a. ADC b. DAC c. encoder d. decoder
Electronics System & Technologies

It is an error detection technique in which
a redundant bit is appended to every data
unit so that the total number of 1s in the
unit (including the parity bit) becomes
even.
a. vertical redundancy check
b. longitudinal redundancy check
c. cyclic redundancy check
d. checksum

A local area network topology in which
the individual terminal, microcomputers
or workstations are connected directly to
a central computer.
a. Star b. Ring c. Bus d. Mesh

The only way to achieve high data rates with a
narrowband channel is to increase the number
of bits per symbol, the most reliable way to do
this is to use a combination of amplitude and
phase modulation known as _________.
a. quadrature amplitude modulation
b. phase shift keying
c. frequency shift keying
d. frequency modulation

a. quadrature amplitude
modulation

Find the maximum dynamic range
for a linear PCM system using 16-
bit quantizing.
a. 4.82 dB b. 25.84 dB
c. 51.68 dB d. 98.08 dB

d. 98.08 dB
DR = 1.76 + 6.02m; dB
DR = 1.76 + 6.02(16)
DR = 98.08 dB

Compute the baud rate for
a 72000 bps 64-QAM signal.
a. 12000 baud
b. 1200 baud
c. 120000 baud
d. 12 baud

a. 12000 baud
A 64-QAM signal means that there are
6 bits per signal element since 26 = 64.
Therefore, baud rate = 72000/6
baud rate = 12000 baud

A telephone signal takes 2ms to
reach its destination. Calculate
the via net loss required for an
acceptable amount of echo.
a.0.6 dB b. 1 dB c. 0.4 dB d. 0.8 dB

d. 0.8 dB
VNL = 0.2t + 0.4dB
VNL = 0.2 (2ms) + 0.4 dB
VNL = 0.8 dB

Telephone switch that connects
only to other switches, and not
to individual customers.
a. central office b. toll station
c. tandem office d. PSTN

It is a form of digital modulation
similar to PSK except the digital
information is contained in both
amplitude and the phase of the
transmitted carrier.
a. FSK b. ASK c. QAM d. BPSK

The most common circuit used
for demodulating binary FSK
signals.
a. squarer b. PLL
c. bandpass filter d. frequency divider

We have an audio signal with a
bandwidth of 4KHz.What is the
bandwidth needed if we modulate
the signal using AM? Ignore FCC
regulations for now.
a. 4 KHz b. 8 GHz c. 8 KHz d. 4 GHz

b. 8 KHz
BW = 2 x 4 KHz = 8 KHz

We have an audio signal with a
bandwidth of 4 MHz. what is the
bandwidth if we modulate the
signal using FM? Ignore FCC
regulations.
a. 8 MHz b. 8 MHz c. 36 MHz d. 40 MHz

For PCM system with the following
parameters determine the minimum
number of bits used.
Maximum analog frequency = 4 khz,
maximum decoded voltage = ±2.55,
Minimum dynamic range = 199.5
a. 7 b. 6 c. 8 d. 9

c. 8
n = log (199.5 + 1)
log 2
= 7.63
= 8

A network topology in which data
circulates from one computer to
the next in sequence.
a. Ring b. Star c. Bus d. Mesh

Find the maximum dynamic range
for linear PCM system using 8-bit
quantizing
a. 2.01 dB b. 20.1 dB
c. 49.92 dB d. 4.992 dB

c. 49.92 dB
DR = 1.76 + 6.02(m)
DR = 1.76 + 6.02(8)

What frequencies would be
generated by a telephone using
DTMF signalling, when the
number 8 is pressed?
a. 697 Hz and 1477 Hz
b. 941 Hz and 1633 Hz
c. 852 Hz and 1336 Hz
d. 770 Hz and 1209 Hz

It is a means of transmitting data
by shifting the phase angle of the
transmitted signal.
a. FSK b. PSK c. ASK d. QAM

The name given for a set of standards for
communicating among computers in which the
primary purpose is to serve as a structural
guideline for exchanging information between
computers, workstations and networks.
a. OSI b. TCP/IP c. PDU d. LAN

Any transmission system which conveys more
than one signal simultaneously can experience
this type of interference due to the reception of
portions of a signal from one channel in
another channel.
a. Distortion b. Noise c. Crosstalk d. Echo

What type of digital modulation scheme
uses two or more different output
frequencies?
a. PSK b. FSK c. QAM d. QPSK

It is an error-correcting code used for
correcting transmission errors in
synchronous data streams.
a. Hamming code b. Morse Code
c. ASCII code d. Baudot code

A suite of protocols that allows a
wide variety of computers to share
the same network.
a. TCP/IP b. HTTP c. FTP d. SMTP

Noise that is primarily caused by
lightning. Often called as Static Noise.
a. external noise b. equipment noise
c. atmospheric noise d. space noise

A modulation technique in which the
frequency of the modulated signal
varies with the amplitude of the
modulating signal.
a. AM b. FM c. PM d. HM

Is a form of constant –amplitude angle
modulation similar to standard frequency
modulation except the modulating signal is a
binary signal that varies between two discrete
voltage levels rather than a continuously
changing analog waveform.
a. ASK b. FSK c. CP-FSK d. BPSK

The highest layer in the hierarchy and is
analogous to the general manager of the
network by providing access to the OSI
environment.
a. Application layer b. Presentation Layer
c. Transport layer d. Session Layer

What is the equation for Hartley’s Law?
a. I = ktB
b. C = 2Blog2M
c. fa = fs - fm
d. N = 2^m

Network topology wherein individual
terminals, microcomputers and
workstations are connected directly to a
central computer.
a . Mesh b. Bus c. Ring d. Star

The loss of data that occurs when two
stations transmit at the same time on a
network
a. multitasking b. cross-over
c. collision d. traffic

A term used to describe a telephone
instrument whose handset is on its cradle,
ready to receive a ring signal
a. On hook b. Off hook
c. crosstalk d. sidetone

The most commonly used digital
modulation scheme.
a. PCUM b. PPM c. PDM d. PCM

Simple form of redundancy error checking
where each character has a numerical
value assigned to it. The characters within
a message are combined together to
produce an error checking character.
a.CRC b. LRC c. Checksum d. VRC

Is an eight-bit fixed length character set
developed in 1962 by the International
Business Machines Corporation.
a. ASCII code b. Baudot Code
c. EBCDIC code d. Code 39

An attempt is made to transmit base band
frequency of 30khz using a digital audio
system with a sampling rate of 44.1khz.
What audible frequency would result?
a. 14.1KHz b. 74.1KHz
c. 14.1MHz d. 7.05KHz

a. 14.1KHz
fa = fs – fm
= 44.1KHz – 30KHz
= 14.1 KHz

Calculate the capacity of a telephone
channel that has a S/N of 1023?
a. 16,000 b/s b. 30,000 b/s
c. 25,000b/s d. 3000 b/s

b. 30,000 b/s
The telephone channel has a bandwidth
of about 3KHz
C = BW log2 (1+ S/N)
= 3 x 103 log2 (1+ 1023)
= 30000 b/s

Designed to send characters of the
message with the specified bit rate
but without any fixed timing
relationship from one character to the
next.
a. asynchronous b. synchronous
c. error detection d. error corection

Token Ring Standard
a. 802.2 b. 802.3
c. 802.4 d. 802.5

The sensitivity of a radio receiver is
given in terms of dBm. If the receiver
is receiving 200 mW, what is the
corresponding dBm of this signal?
a. 46dBm b. -46 dBm
c. 23 dBm d. -23 dBm
Laws and Ethics, Analog and Digital Electronics, Microelectronics, Power Line Communications

c. 23 dBm
dBm for 200 mW = 10 log (200mW/1mW)
= 23 dBm

An antenna with a noise temperature of
75 Kelvin is connected to a receiver input
with a noise temperature of 300 K. Given
the reference temperature T0 = 290 K,
find the noise figure of the system.
a.0.97 dB b. 3.6 dB
c. 6.02 dB d. 7.2 dB

b. 3.6 dB
The total noise temperature of the antenna and receiver is
NTtot = 75+ 300 = 375.
The noise temperature is given by: NT = T0(NR-1)
where: NT – noise temp, NR = Noise ratio
Rearranging the above to find NR gives:
NR = (375/290) +1 = 2.29
The Noise figure is the decibel equivalent of the noise ratio,
such that:
NF = 10 log NR
= 3.6 dB

The modulation index of an AM radio
station is 0.75. If the carrier power is
500W, what is the total transmitted
power?
a. 391 W b. 438 W
c. 641 W d. 688 W

c. 641 W
The modulation index m is related to the total transmitted
power Pt by:
Pt = Pc(1 + m 2)
2
where Pt = total transmitted power, Pc = carrier power

An FM transmitter system is using a 1MHz crystal oscillator to
generate a very stable 108MHz final carrier frequency. The
output of the crystal oscillator is fed to a x36 multiplier circuit
then mixed with a 34.5 MHz signal. The sum output of the
mixer is filtered out, while the difference is fed to another
multiplier in order to generate the final carrier frequency. What
is the multiplier value?
a. 108 b. 3
c. 1.5 d. 72

d. 72
Basic Block Diagram of the FM carrier generator:
1 MHz carrier > x 36 > Mixer > Multiplier > 108MHz carrier
First Multiplier output:
1MHz x 36 = 36 MHz
Mixer output:
36MHz + 34.5 MHz = 70.5MHz (filtered output)
36MHz – 34.5 MHz = 1.5 MHz (difference fed to the next multiplier)
Multiplier stage:
Output = 108MHz
Output = 1.5MHz x n
N = 108/1.5
= 72

The position x of an experimental rocket moving
along a long rail is measured to be x(t) = (4m/s)t +
(7m/s2)t2 + (5m/s3)t3 – (0.35m/s4)t4 over the first
10s of its motion, where t is in seconds and x is in
meters. Find the velocity of the rocket for the first 10
seconds.
a. 43 m/s b. 224 m/s
c. 244m/s d. 2240 m/s
General Engineering and Applied Science Physics

c. 244m/s
v = dx/dt
= (4m/s) + (14m/s2)t + (15m/s3)t2 – (1.4m/s4)t3
Substituting t = 10 s, gives
v = 244 m/s

Early in the nineteenth century, James Watt invented the steam
engine. In order to convince people, who relied heavily on horses for
mechanical work, he demonstrated how useful his steam engine was
by utilizing a horse that lifted water from a well over a certain period
of time and called the corresponding power expended “one
horsepower”. Assume that water has a mass density of 1.0 x 103
kg/m3, that the well was 20m deep, and that the horse worked for 8
hours. How many liters of water did the horse raise from the well?
Use the following constants: 1 hp = 746 Watts, g = 9.8 m/s2.
a. 1.1 x 10 2 L b. 110 L
c. 1.1 x 103 L d. 1.1 x 105 L

d. 1.1 x 105 L
The work done of the tension in lifting a mass of water is
given by: W = m g Δ y
Where: W = work, m = mass = pV,
Δ y = distance, V = volume, p= mass density,
The power is given by:
P = work /time, pVg Δy
t
Substituting all values, we get for V
V = (746W)(8hx3600s/h)
(1x103 kg/m 3 )(9.8m/s2)(20m)
= 1.1x102 m 3
Since 1 m3 = 103 L, then V = 1.1 x 105L.

As provided in ACT 3846, the construction of a
radio station shall begin only when
a. A personnel of NTC has conveyed through telephone that
the application has already been approved.
b. the firm applying for the construction permit has submitted
to the NTC its application for the same.
c. the technical documents has already been signed and sealed
by the PECE.
d. The NTC has already issued a Permit to construct

d. The NTC has already issued
a Permit to construct

As provided in RA7925, a VAS provider needs to
secure a franchise if
a. it is offered by a telecommunications entity whose
proceeds of utility operations are not cross-subsidized.
b. it does not discriminate other service providers against
rates.
c. it is offered by a telecommunications entity that uses a
separate book of accounts for VAS.
d. It puts up its own network.

d. It puts up its own network.

According to the code of ethics, if you are
employed in a company and you wish to
engage in a business which may compete with
your company, the most ethical thing to do is to
a. inform your employer about it
b. have somebody run the business instead of you
c. try to find new clients
d. keep your prices lower than your company’s

a. inform your employer
about it

This act is was consolidation of House Bill No.
5224 and Senate Bill No. 2683.
a. RA 9292 b. RA 5734
c. RA 6541 d. None of these
Contracts and Obligations

Date of approval of RA 9292
a. April 14, 2004 b. April 14, 2007
c. April 17, 2004 d. None of these

There are __________ Articles and __________
sections in the RA 9292.
a. 8,42 b. 8, 43 c. 7, 43 d. 7,42

Any person who shall violate any provision of
RA 9292 or any rules, regulations, the Code of
Ethics and the Code of Technical Standards of
Practice is stated in section _________.
a. 35 b. 36 c. 37 d. 38

The chairperson of the PRC shall include in the
Commission’s program the implementation of
RA 9292, the funding of w/c shall be included in
the Annual General Appropriation Act.
a. Sec 39 b. Sec 40
c. Sec 41 d. Sec 42

It is a method of managing all the activities
that affect the quality of goods or services in
order to prevent faults.
a. Quality Assurance b. Quality Circle
c. Quality Control d. Quality Standard
Management/Operational Research

This type of business organization can be set up
without any formality. It exist when there are a
number of people involved who are part
owners of the business.
a. Association b. Corporation
c. Partnership d. Sole Proprietorship

Items purchased from a vendor cost Php 20
each, and the forecast for next year’s demand
is 1,000 units. If it costs Php 5 every time an
order is placed for more units and the storage
cost is Php 4 per unit per year, what quantity
should be order each time?
a. 20 b. 30 c. 40 d. 50

A project has been defined to contain the following list of
activities, along with their required times for completion
What is the completion time of the whole project?.
a. 17 days b. 22days c. 25 days d. 37 days

It is the process of attracting potential
employees to the company so that the
selection process can be carried out.
a. Advertising b. Benchmarking
c. Selection d. Recruitment

A hole is to be punched out of plate having a
shearing strength of 40 ksi. The compressive
stress in the punch is limited to 50 ksi. Compute
the maximum thickness of plate from which a
hole 2.5 inches in diameter can be punched.
a. 0.500 in b. 0.781 in
c. 0.102 in d. 0.204 in
Strength of Materials

b. 0.781 in
t = 2.5(50) / 4(40)
= 0.781 inches

A hole is to be punched out of plate having a
shearing strength of 40 ksi. The compressive
stress in the punch is limited to 50 ksi. If the
plate is 0.25 inches thick, determine the
diameter of the smallest hole that can be
punched/
a. 0.800 in b. 0.871 in c. 0.435 in d. 0.600 in

a. 0.800 in
D = 4(0.25)(40) / 50
= 0.800 inches

At what angular velocity will the stress in a
rotating steel ring equal to 150 MPa if its mean
radius is 220 mm? The density of the steel is
7.85 Mg/m^3.
a. 19.87 rad/s b. 159 rad/s c. 138.2 rad/s d. 628 rad/s

d. 628 rad/s
ω = (1/0.22)(150x10^6 / 7850)^(1/2)
= 628 rad/s

It explains combustion as a result of loss of a
substance.
a. Phlogiston b. Roasting
c. Reduction d. Fission

The volume of a definite quantity of dry gas is
inversely proportional to the pressure provided
the temperature remains constant.
a. Charles’ Law b. Boyle’s Law
c. Gay-Lussac’s Law d. Dalton’s Law

It refers to matter that do not have definite form
or structure.
a. Amorphous b. Morphous
c. Transient d. Extrinsic

Three grams of sulphur dissolved in 200 g of
naphthalene C10H8, was found decreasing the
freezing point of the solvent to 0.72 ⁰C. Find the
molecular weight of the solute. (Kf C10H8 = 6.9
⁰C/molar)
a. 351.16 g/mole b. 115.32 g/mole
c. 135.61 g/mole d. 151.23 g/mole

Substance having a pH level less than 7
a. acid b. base c. Salt d. hydrate

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