B a l l iI ' Dar Uniyersity ~ Institute of Technology School ofComputing and Electrical Engineering Suppleme nta ry Holi st ic Examination f o rElectrical and Compu te r ' Engineering pro gr am (Extension) Date: August 02, 2011 Time allowed: 3Hrs Do no tturn this'page until you are t old to d o so General Instruction This examination paper contains eight parts. Attempt each question accord ing to the instructions gi ven in each part. Give your ans \\'ers on the answer sheet provided for each part. I Part Res ult I r ~ I I I I I I , - - --- - I I V L ~ _ . ._ . .- --. _. _ - - - - ~ I V - - V I V I I V I I I ,
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Hollistic Supple Men Try Exam Extention Electrical
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8/4/2019 Hollistic Supple Men Try Exam Extention Electrical
[Introduct ion to comp uting & Obje ct Oricn ted Programmingl
QJ.
Create a class called Com plex f or perf orming arithmetic with com plex numbers.Comp lex numbers have the f orm
realPart + imaginaryPart*i where i = -J -1
Write a program to test your class. Use f loRting-point variables to represent the privatedata of the class. Provide a constructor that enables an ob ject of this class to be initializedwhen it is declared. Provide a no-argument constructor with default values in case noinitializes are provided. Provide public methods that perform the following operations:
[12 pt s J
a. Add t\\ 'O C omplex numbers: The real parts are added together and the imagincryparts are added together.
b. Subtract two Comp lex numbers: The real part of the right operand is subtracted
from the real part of the left operand, and the imaginary part of the right operand issubtracted f rom the imaginary part of the left operand.c. Prin t Complex numbers in the f orm (a, b), where a is the real part and b is the
imaginary part.
Part II 122 pts] [recom mended t ime 40 mini
IEleetriea l Ma terials and Tec hnology & App lied E lect ronics I and [J I
QJ.
Explain the f ollowing terms and describe their importance in characterizing solids. (6Pt5)
i) Band theoryii) Fermi level
Q2.Describe the three BJT configurations and draw their input and output i-v characteristics.
(8P t 5)
Q3,For the circuit :::ho'. \ n below, use superposition to find va in terms of the input voltagesV I and V 2 ' Assume and ideal op amp and (8pt s)
VI = 10 s in(2r r x 6 0t) - 0 .1 s in(2rr x 1000 t) vo Lt sV2 = 10 s in(2rr x 60t) + 0.1 s in(2r r x 100Gt) volt s
8/4/2019 Hollistic Supple Men Try Exam Extention Electrical
Clearly state the difTcrcncc between \ ,,,ound rotor and squirrel cage induction motor interms of speed control.
Q3.It is not recommended to dri\ 'e dc series motor with belt driven load. Why?
Pal"t VI [9 ptsl/recommende<.l time 15 mini /Intro<.luction to Communication Systems]
For the AM signal expressed 3S Ac[l + Amcos(2rrJ ;nt)]cos(2r r f ct) find the expressionfor modulation ef ficiency.
Part VII 17 pts] /recommen<.led time 13 ri1inl
IElectromagnetic Fields]
Ql.
The point charge Q = 18nC has a velucity ot"Sx 106 m/ s in the direction O.04a~ - O.O Sa y +
0.2a z. Calculate the magnitude of the force exerted on the charge by the f ielda) B = -3a x + 4a)' + 6 a z mTb) E = -3a x + 4a y -+ 6 a z kV / mc) Both Band E acting together
Part VIII 18 rtslll'ecommcndcd time 15 minI
[Introduction to Control Engineeringl
Q2.Write major dif ferences bet\\ "een f requency domain analysis and time domain analysis incontrol system