152106883 iecep electronics and communications engineering quiz 2012

IECEP-Manila Form 1 S.2012 TEST QUESTIONS

1. Please Use One Page per Question. 2. Fill-out all needed information. 3. Submissions with incomplete data will not be considered.

Name of School Technological University of the Philippines - Manila

Signature over Printed Name of the Coach/Adviser

Engr. Edmon O. Fernandez

Please indicate the subject: () Mathematics (/) General Engineering and Applied Science () Electronics Engineering () Electronics System & Technologies

QUESTION: On the basis of magnetic response, superconducting materials

while in the superconducting state, are completely diamagnetic; that is,

all of an applied magnetic field will be excluded from the body of

material, a phenomenon known as the ___________.

ANSWER: Meissner effect

SOLUTION ( IF PROBLEM -SOLVING)

Reference: Materials Science and Engineering, An Introduction, 7th ed, William D. Callister, pg 105







QUESTION: In environmental engineering, this refers to the SI measure

of source strength or total radioactivity, and is defined as one

disintegration per second.

ANSWER: Becquerel


Reference: Environmental Engineering 4th edition, Weiner and Matthews,

page 319







QUESTION: In physics, this refers to a situation in which a very small

change in one place can amplify into a large change somewhere else.

ANSWER: Butterfly effect


Reference: Conceptual Physics, 10th edition, Paul Hewitt, page 762







QUESTION: A thin metal can is rolls down an inclined plane and reach the bottom with the speed of 4.43 m/s. Determine the speed at the bottom

when the can is full.

ANSWER: 5.12 m/s


Reference: College Physics 5th Ed. by Weber, Manning, White and Weygand,

pp. 126-127







QUESTION: The bob of a pendulum has its rest point 1.00 m below the support. The bob is pulled aside until the string makes an angle of 15

degrees with the vertical. Upon release, with what speed does the bob

swing past its rest point?

ANSWER: 0.82 m/s


Reference: College Physics 5th Ed. By Weber, Manning, White and Weygand, p. 92






Please indicate the subject: () Mathematics () General Engineering and Applied Science (/) Electronics Engineering () Electronics System & Technologies

QUESTION: It states that at any point P the magnitude of the magnetic field

intensity produced by the differential element is proportional to the product of the

current, the magnitude of the differential length, and the sine of the angle lying

between the filament and a line connecting the filament to the point P where the field

is desired.

ANSWER: Law of Biot-Savart SOLUTION ( IF PROBLEM -SOLVING)

Reference: Engineering Electromagnetics (5th Edition) by William H. Hayt, Jr., pp 217







QUESTION: When controlling the action of a relay, one of the cheapest but most

effective ways to protect the switching system is to place a capacitor across the

terminals of the coil. This capacitor is commonly called _____?

ANSWER: Snubber SOLUTION ( IF PROBLEM -SOLVING)

Reference: Electronic Devices and Circuit Theory (10th Edition) by Robert L. Boylestad & Louis Nashelsky, pp 107







QUESTION: A 1500-turn solenoid produces 600,000 maxwells when excited by a

current of 2.5 amp. Calculate the inductance.

ANSWER: 3.6 Henrys SOLUTION ( IF PROBLEM -SOLVING)

Reference: Electrical Circuits (2nd Edition) by Charles S. Siskind, pp 204







QUESTION: Aseries of specb-aP lines obtained by the scattering of electrons when an electron beam is directed against a crystalline solid. The pattern may be interpreted to yield information on

the structure of the crystal and its mechanical perfection.

ANSWER: Kikuchi Lines SOLUTION ( IF PROBLEM -SOLVING)

Reference: Modern Dictionary of Electronics 7th Ed. By Rudolf F. Graf







QUESTION: Simplify the Boolean expression to a minimum number of literals: xy +

yz + xz

ANSWER: xy + xz SOLUTION ( IF PROBLEM -SOLVING) xy + yz + xz = xy(z + z) + yz(x+ x) + xz(y + y) = xyz + xyz + yzx + yzx + xzy+ xzy = xyz + xyz + xyz + xyz = xy(z + z) + xz(y + y)

= xy + xz

Reference: Digital Design by M. Morris Mano, 2nd ed., p 69






Please indicate the subject: () Mathematics () General Engineering and Applied Science () Electronics Engineering (/) Electronics System & Technologies

QUESTION: Informations transmitted to the mobile phone, either

subscribed or unsolicited messages, without a user request and are

initiated by the server of the content provider.

ANSWER: Push messages SOLUTION ( IF PROBLEM -SOLVING)

Reference: Section 2 NTC Memorandum Circular No. 03-02-2005, Rules and Regulations on Broadcast Messaging Service







QUESTION: It is a wireless networking scheme that competes with both

802.11 and bluetooth schemes. It uses frequency hopping ang spread

spectrum communication at 2.4GHz and is intended for small home

networks.

ANSWER: Home RF SOLUTION ( IF PROBLEM -SOLVING)

Reference: Electronics Communications Systems by Roy Blake, p. 870







QUESTION: It is a wireless technology that enables a variety of contactless and

proximity-based applications, such as payments, information retrieval, mobile marketing

and device pairing. It has an operating range of 10 cm or less using the 13.56MHz

frequency band. There are currently three user modes defined for its operation: 1) Card

emulation, 2) Tag reading, and 3) Peer-to-peer (P2P). These modes are based on several

ISO/IEC standards, including ISO14443 A/B, ISO15693 and ISO18092.

ANSWER: NFC (Near Field Communication) SOLUTION ( IF PROBLEM -SOLVING)

Reference: http://www.gartner.com/it-glossary/near-field-communication-nfc/







QUESTION: Assume we need to download text documents at the rate of 100 pages per

minute. What is the required bit rate of the channel?

ANSWER: 1.636 Mbps SOLUTION ( IF PROBLEM -SOLVING) A page is an average of 24 lines with 80 characters in each line. If assume that one character requires 8 bits, the bit rate is: Bit rate = (100)(24)(80)(8) = 1 636 000 bps Bit rate = 1.636 Mbps

Reference: Data Communications and Networking by Behrouz A. Forouzan, 4th

ed., p73







QUESTION: Determine the fade margin for the following conditions: distance between

sites, d = 50 km; frequency, f = 1.8GHz; very dry mountainous terrain and a reliability of

99.9999%.

ANSWER: 36. 25 dB SOLUTION ( IF PROBLEM -SOLVING) Fm = 30logD + 10log(6ABf) 10log(1-R) 70 Where A = roughness factor, 0.25 for mountainous terrain B = factor to convert a worst-month probability to an annual probability, 0.125 for very dry mountainous terrain = 30log(50) + 10log[(6)(0.25)(0.125)(1.8) 10log(1-0.999999) 70 Fm = 36.25 dB

Reference: Electronics Communications Systems by Wayne Tomasi, p. 628-629






Please indicate the subject: (/) Mathematics () General Engineering and Applied Science () Electronics Engineering () Electronics System & Technologies

QUESTION: The geometric mean of several positive numbers is smaller than the arithmetic mean of these numbers.

ANSWER: Cauchys Mean Theorem SOLUTION ( IF PROBLEM -SOLVING)

Reference: 100 Great Problems of Elementary Mathematics by Heinrich Drrie, p.37







QUESTION: A line segment joining the vertex of a triangle to any given point on the

opposite side is called?

ANSWER: Cevian SOLUTION ( IF PROBLEM -SOLVING)

Reference: Geometry Revisited Vol. 19 by H.S.M. Coxeter & Samuel L. Greitzer, p.4







QUESTION: It states that if L{F1(t)} = L{F2(t)}, then F1(t) F2(t) = N(t), where N(t) is a

null function. That is, an inverse Laplace transform is unique for the addition of an

arbitrary null function.`

ANSWER: Lerchs Theorem SOLUTION ( IF PROBLEM -SOLVING)

Reference: Elementary Differential Equations 7th edition by Earl D. Rainville & Phillip E. Bedient, p. 210







QUESTION: Find the shortest distance from the point to the plane

ANSWER: 4/3 units SOLUTION ( IF PROBLEM -SOLVING)

But

It follows that if is minimum, is also minimum. Applying maxima-minima for partial derivatives, we have:

Solving the two equations simultaneously and using we obtain

Hence,

Reference: Calculus with Analytic Geometry, pp. 441-442, Thurman S. Peterson







QUESTION: A lumber mill cuts rectangular beams from circular logs. If the diameter of the log is 16 inches and the cross-sectional area of the beam is 120 square inches, find the dimensions of the cross section of the beam. Give the exact values. ANSWER: SOLUTION ( IF PROBLEM -SOLVING)

Let a and b be the dimensions

Hence,

Reference: Precalculus: Functions and Graphs, pg.80, 5th edition, Barnett, Zeigler and Bayleen

152106883 iecep electronics and communications engineering quiz 2012

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