Holistic Examination Extention Electricals

8/4/2019 Holistic Examination Extention Electricals

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I Ll~//j//'o''lF /////r/erH(r

fnstit!!f{' of TcclInology

School of Compi:ting ;1IJd Electr ical Engineering

Holistic Examination

for

Electrical and Computer Engineering program (Extension)

Date: Julv2G~ 2011

Time Llilowed: 3Hrs

Do not turn Ih{";/}/IS'"f? until yOll are told to do so

General lnstrllction

This exam ination paper contaIns eight parts. Attempt each questIon

JCC'O!"O\n.g to the instructions given in e8c!1 part. Give yom an swers on the

answ er sheet provide d fo r ea ch pa rt

~6 \ ~L ~ 1 ---- - Resu!t

II

[[l

IV

V

VI

VII

VIIIi


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Par-( I [12 ptsll,ccolllmcndcd timc 22 minI

IIntroduction to computing &Objcct Oriented ProgrammingJ

QI.

Define a superclass called Employee that has two subclasses: Instructor and

Call1pusPolice. For empolyee, we only have sim ple attributes such as their nam e and id.

For Instructors and Camp us polices, each has specific attributes unique to the class.

Camp us polices have attributes such as working hours and the gate they are in charge.

Instru ctors ha v e attributes such as the name o f t h e department they are member of and the

lisl of courses they're teac hing.

a. Create a test class and exe rcise the inte rfaces of the \ arious cla ss es you defined, by

creating the corresponding objects.

b. Draw the hierarch ical relationship formed by the classes you defined.

Part II 122 pts] [recommended time 40 min]

[Electrical Materials and Technology &Applied Electronics I and II ]

Explain the following terms and verify how they are important in characterizing

materials (solids)

a. Work function (1.5 Pts)

b. Hall Effect. (1.5Pts)

Q2.

Explain the effect of temperature on the electrical/conducting property of solids(Insulators, Semiconductors, and Conductors). (3Pts)

Q3.

Describe how depletion layer is very important in electronic dev ices a n d how \,vill it

behave with applied biasing \'oltage. (4Pt!

Q4.

Write the main sim ilarit ies and diffe ren ces of BlT and FET. (2Pts)

Q5.

Explain how and 'vvhy BlT action is removed or elirnin ated in FETs. (2Pts)

Q6.

Design an inverting amplifier \\hose gain is variable over the range -10 ::; C ::; -1 by

means of a 100 KD . potonti ometer. (G is the closed loop gain) (8pts)


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I'art III [20 ptslln:coIllll1cndcd time 3(, mill]

[Network Analysis and Synthcsis, Digital Signal Pnlccssing & Signals & Systems

Analysis I

Q l.

Show that the following impedance function is minimum function and Synthesis it

Q2.

for the LTI system shown bellow find the response of the system(y[nJ)

~ IX[n]= [-2, -1 , g , 1,2] LTI system => h[n]h[n] =[-2,-1 ,~!, 1 ,2]

1 . . t

The OFDM recei\'er shown below picks up the signal r(t), which is then quadrature -

mixed down to baseband using cosine and sine waves at the carrier frequency. This also

creates signals centered on 2f(', so low-pass filters are used to reject these. The baseband

signals are then sampled and digitalized using analog-to-digital converters (ADes), and a

forward FFT is used to convert back to the frequency domain. This returns N parallel

streams, each of which is converted to a binary strean1 using an appropriate symbol

detector. These streams are then re-combined into a serial stream, s [n], which is an

estimate of the original binary stream at the transmitter. Find the output signal Y" (K)

for the input signal of x[n] = [1,0, 1,0, 1] shown below using radix-2 Decimation In

1 ,\CC f -

r - - - - +x(n) I ----+

I=:I . ----+ --0-Y r 'J , 2 0

Yrl.l. b''::ym.oi

Detector

para!!'=',

to ser'ial


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a) Find the impulse response, h(t) for t2:0 if the system differential equation is

y'(t) + 2y(t) = 5x(t) with initial condition y(O) = I (2 pL)

b) Find & plot the convolution or >.:(t)=2TI(t/2) and

vet) =2e-t

u(t)

Q5.

A Lin ear Time Invariant continuous time system has frequency response function

H(co) = j1, 2 : : : ; 1 co1 : : : ; 7

10, all other c o

Compute the output response yet) from the input.

x(t) =2 + 3cos(3t) - 5 sin(6t - 30) + 4cos (13t - 20) , -00 < t < C/J

Part IV [14 ptsJ [recommended time 25 minI

[Digital Logic Design and Computer Architecture and OrganizationJ

Q1.

Design a 4-input data selector (multiplexer) digital circuit. In your design, clearly show

the truth table and logic diagram. (4p IS ]

Q2.

Design a decade ripple asynchronous up counter. Show the logic diagram and verify your

logic circuit using timing diagram. (4p IS ]

Q3.

The basic function of a computer is to execute programs. Briefly explain the two steps of

program execution and draw the instruction cycle that con stitutes these (\\0 basic steps.

(3pIS]

Q4.

Briefly describe the three types of peripheral devices.

Part V [8 pts] [recommended time 14 min]

flnt.'oduction to Electrical Machines]

Q I.Write the equation for frequency of emf induced in an alternator _

Q2. Induction motor cannot run at its synchronous speed during normal operation


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Q4 . A de shunt generator when driven without any excitation shows an open circuit voltage of

that there is no residual magnetism. (True/False)

Q5. T\vo transformers are connected in parallel to share loads in the ratio of their KVA rating

the requirement is that their ohmic impedances are equallin

direct ratio of their rating/ in inverse ratio of their ratings)

Q6. A dc series motor is never to be switched on without load connected at rated voltage for

the reason that (the initial field current is zero/ the speed is toohigh)

Part VI [9 pts] [recomm ended time 15 minI

[Introduction to Communication Systems]

Ql.

,-\ carrier signal expressed by 1Oeas(2JlX 106/) is AM modulated by a message signal of

O.85cos I Oeas( 3 JlX 103 t)

a) Find the overall percentage of modulation

b) The carrier pow er

c) The Peak envelop power

Q2.

a) Draw a general superheterodyne receiverb) For AM t:'ansmission of 540kHz - 1760kHz, determine the local oscillator frequenc yrange for an IF of 455kHz

c) For FM transmission between 88M Hz- 107M Hz, determ ine the local oscillator

frequency range for an IF of 10. 7MHz

Part VIT [7 pts j [ ,'ecommended time 13 minI

[Electromagnetic Fields]

Ql.

A charged particle with a mass of2.4kg and charge of2 .8 C starts form rest at (2,6, -2) in a

region where E =-4ay + 3az Vim and B = 1.5W b/m2. Determinea) the force acting on the charged particle

b) the location and velocity of the particle at I sec


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P:lI-t VIII 1 8 pI S! 1'"ccommc'H lcd timc 15 minI

IInt'"odu ction to C ont l'O } Enginccring !

Q1.

Obtain the transfer function in terms of 81ll IVi for the following circuit d iagram.

= l" :'I' \- -SLld"

Design PO controller that satisfies the step response S =0.707 and tp= 0.05 see for Q I

Given that

Ra=2.6D

La=0.18mH

J -" ' 87* 10-7!, 2I11-J.. , ,- g m

KIll=0.00767V -s/rad

Holistic Examination Extention Electricals

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