|13{iqr^rl3lt r-sialt 1.r -r+drAilt i'.LrltUniversity of Technology - Electromechanical Engineering Dept.

Final Exam -Sample ( ) - 2012-2013Study: Power Branch - Class:2uSubject: Theory of Machine and sfrength of materials

Tine: 3 hoursDate: / /2013

Examiner: a. 5a1aa rrashim & Dr.Muhannad Z. Khlefia Note: Answer Five Questions Only

Ql- A shaft carries four rotating masses A, B, C, and D, in this order alongits axis . The masses radii 18cm ,24cm , 12cm , and 15cm respectively . Themasses of B=30Kg, C=50K8, IF4OKg. The planes containing B and C are 30cm a part. The angular spacing of the planes containing C and D are 900 and210u respectively relative to B measured in the same sense. If the shaft andmasses are to be in complete dynamic balanced , lind the mass and angularposition of mass A, the position of the planes A and D.

Q2- In the epicyclic gear train shown the pitch circle diameter of internallytoothed annulus Q is about to be about 250 mm and the teeth are to have amodule of 4. The annulus is stationary but the arm A carrTing the planet gearR is to make one revolution for every 5 revolution of the sun spindle P and inthe same direction . Find suitable number of teeth for all the gears ,Figure(l).

Figure (1)

Q3- Power is transmitted between two shafts , 4.5 m a part, by an open beltpass round pulleys of 3 m and 2 m diameter respectively , the groove anglebeing 40, if the belt has a mass of 4 Kg/m, and the maximum working tensionis 20 KN , determine the maximum power that the belt can transmit , and thecorresponding speed of the smaller pulley , take p={.2 .

S

Q4- A steel tube, 25 mm outside diameter and l2mm inside diameter, camesan axial tensile load of 40 kltl. What will be the stress in the bar? What furtherincrease in load is possible if the stress in the bar is limited to 225 MN/n2?

Q5- Draw the shear force and bending moment diagrams for the beam loadedas shown in Figure (2), and determine(a) the position and magnitude of themaximum B.M., and (b) the position of any point of contraflexure,

i2l ttl

3m--- -+, lc.--lFigure (2)

Q6- A solid steel shaft (A) of 50 mm diameter rotates at 250 rev/min. Find thegreatest power that can be transmitted for a limiting shearing stress of60 lllN/m'in the steel.It is proposed to replace (A) by a hollow shaft (B), of the Same externaldiameter but with a limiting shearing stress of 75 MN/m2. Determine theinternal diameter of @) to transmit the same power at the same speed.

lan:inel: lr. .Lcrisan & ii. I asser

IJni..,ersit1 of Technoiogl -Electromechanicat Fngineering Depr

Finai Erar:.r- l0 i: -10 i3

l::r::'l lio'-l:

):'r- - li, -:

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Heoi Trunsfer Note: Answer all quesiion

Qi:(a)Consirier steacii heat tansfer through the 'iail ol a roorn in q inter.The conr ection reat t;ans{trcoefilcienr ar the cuter surface of the nall is ii.rree times that oi the inner surface as a iesuil cf ihe u,incls. Oc.,1::i:. :',:rilJe of rhe '..a1. ic _'. c'" :hink rhe ren:peiaiur'J r''ill be ;]us:; to the 'lttr'.:trliii: .ri' :,'1113;31 .11.

Explaiu.

(b) The temperature of a gas stream is to be measured b1' a thermocouple u'hose junction can be approximated

as a i.2-mm-diameter sphere. The properties of the junction are ,t = 35 Wtm oC. p=8500 kg,ijn', and Cp = 329

.l/kg "C, and the heat transfer coefficient between the junction and the gas is h = 65 W/m' "C. Determine

hor long ir will take for the thermocouple to lead 99 percent ofthe initial temperature differer.rce.

Q2: A long 1O-cm-diameter steam pipe whose externai surt'ace tei'nperature is 1i0"C passes thl-ough sone operr

area thar is not protected against the winds. Determine the rate ofheat loss from the pipe per unit of its length

rvhen the air is at 1 atm pressure and 10'C and the w'ind is blowing across the pipe at a velocity of 8 m/s.

Q3 Cold water enters a counter-flow heat exchanger at i 0'C at a rate of 8 kgls. rvhere it is heated b1 a hot u.ater

stream that enters the heat exchanger at 70'C at a rate of2 kg,is. Assuming the specific heat of watet to remain.o,\qfr,rr "t Cn - 4 '. R k.l kp 'C- deterrnine the maximum heat transfer rate lni the outlel telnperatules of the

cold and the hot \\,ater strearns for this limiting case.

.'ll:i |!. t

_t:. l

i;, \l : .\:: ?irpenics r: l-::5. - -^-^ -

1- l\.r= i.l -' i':l ll-

D = x._: y:it - i-!l-,S i:-0.018:4 \\- n,C" & rr-0 r

I

:

r..:L

-Q, k-: -- ^ i- ^.._ -- -

Fluid Mechanics:-Note: answer only two questions,

Q4 :- (A) Derive the pressure variation in static fluid for the three-dimensional case.

(B) The velocity distribution within the fluid flowing over a plate is given by where uis the velocity in(m/s) and y is a distance above the plate in (m). Determine the

shear stress aly:0 and aty-0.2 m. Take that p:0.84 pa.s.*u= Q/4)y_y'

S :-(A) Explain and sketch the boundary layer over a horizontal flat plate, thenwrite the equations that gives the boundary rayer thickness for laminar andturbulent flow.

(B) The smooth flat plate r .5 m long ,30 cm wide is placed in a stream of air at8 m/s . Calculate.l!]9$ess" of boundary layer and skin friction arag torce.p:l.2kg/m Y:l5*10-o mrls. Assume laminar flow.

Qf :- An airplane traveling (400) km,h through still air y:r2 Nim3 , discharges(1000) m3 /sec through iis two (2.25) ri diameter propellers. cui.utut"

(i) The thrust from propellers (ii) The pi".r.r." difference u".o.. ,rr. o.opellers.

r=3/4)'-_rt

Universit-v- of Technolog-v-.-Electromechanical Engineering Dept.

Final Exam-First Attempt - 201 2-201 3

Dare: iciiSubject: Fiuic lviechanics

Examine::Di. \'asset \.& D:.\luafaq SIi \ore: .{nswer onl. 5 quesrion

01: A rectangular gate 1.5 m u'ide and 2.5 m high is I

the sate and its location.

J'5 v",

Q}_A: Prove that the pressure is the same in all the directions at a point in a static fluidfor the three-dimension case.

B: Find the magnitude and direction of the force on the bend. Neglected all energy

degradation, e:120o,vr:v'=30 m/sec and Q:10 Lisec.

{*\

@. The parabolic profile: ut':11','5;3ili6)' is the velocitl'profile in a laminarboundary ia-'-er. at &:0.5*1C". U',:,5 rn'sec and kinetic viscositl Y=1j*i0-'calcuiatethe 6.0.6

74

I

J,

Q4 I a- what is approximate capillary rise of water rn contact withtension 0.073 N/m) in a clean glass tube 5 mm in diameter?

b- Consider a large cubic ice block floating in sea water.The specific gravities of ice and sea water are (0.92 and1.025) respectively. If a 10 cm high porlion of the iceblock extends above the surface of the water, determinethe height of the surface (h) as shown in figur.e (3).

Figure 3

Q5 / In hydroelectric power plant, 100 m3/s of water flows from an elevation of120 m to a turbine, where electric power is generated figure (4). The totalhead loss in the system from point 1 to point 2 is determined to be 35m. If theoverall efficiency of the turbine-generator is g0%, estimate the electricarpower output?

Figure 4

Q6 / Fined the manometer reaCing (R) shown in figure (5) if Vy:0.6 m/s?

Figure 5

air (surface

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Universit.v of Technology -Electromechanical Engineering Dept

Final Exam-2012-2013

Class:2nd

Subject: Heat Transfer

Examiner: Dr.lbtisam Ahmed

Time:3 hours

Date: I 12013

Name: lD No.

Note : -Answer only five equations

o,l ..A surface is subjected to the spectral irradiation shown in the figure below' The surface reflects 40%

of the irradiafion and has an emissive power of 600 W/m'z. (a) What is the irradiation (G)? (b) what is the

radiosity ( J)? (c) what is the net radiative heat flux leaving the surface' q"'ua ?

^ {o0, 300

20t10n

0

@Water at rhe rate of 3.783 kg/s is heated from 37.78 1o 54.44'C in a shell-and-tube heat exchanger'

6-n the shell side one pass is used with water as the heating fluid, 1.892 kg/s, entering the exchanger at

93.33'C. The overall heat-transfer coefficient is l4l9 W/m2 ''C, and the average water velocity in the

1.905 cm diameter tubes is 0.366 m/s. Because of space limitations, the tube lengh must not be longer

than 2.43g m. Calculate the number oftube pu$.r,ih. number oftubes per pass, and the len$h ofthe

tubes, consistent with this restriction.

Note: F two tube passes : 0.88, C*"t". =4. 180 kJ'&g ' 'C' & p\\'ater : 1000 Kg/m3

@waterflowsatavelocityu.=1m/SoveraflatplateoflengthL=0.6m.Considertwocases,oneiorwhich the \.vater temperatul.e ts approximately 300K and the other for an approximate water temperature of

350K. ln the laminar and turbulent regions, experimental measurements show that the local convection

coefficients are well described bY

Hr",r,(x) : C,u' *-o 5 Hrur6(x) : Clur6 x-o

2

Where x has units of m. At 300 K' Cra.,:oo:395 Wmr5'K Ct"l':oo =2330 Wm'''K

While at 350 K, Cr",".rso =477 Wmr5'K Ctu't':so =3600 W/mrs K

As is evident, the constant c depends on the nature ofthe flow as well as the water temperature because

ofthe thermal dependence ofvarious propenies ofthe fluid. Determine the average convection coefficient.

h . over the entire plate for the t*'o water temperatures.

Hint:waterpropertiesatT=30oK,p=997Ke1m3, F= 855x 10'6 N ' s/m2' Atr=350K, p= 974Kg/m3 ' F-

365x 10-6 N . s/m2. And transition occurs at a critical Reynolds number of Re,,.= 5t 16s'

Q{Consider the following fluids at a film temperature of 300 K in parallel flow over a flat plate with

velocitv of 1 m/s; atmospheric air, water and engine oil. For each fluid, determine the local convection

coefficient at X= 40 mm, and the average value over the distance fr rm X= 0 to X= 40mm.

Properties: Air(300K, 1 atm);v= 15.89. 10'6 m'1s, K= 25.3. L0 3W/m.K, Pr=o.707.

Water (300K);v= 0.858x10-6 m'7s, K= 0.513 W/m.K, Pr=5.83.

Engine oil (300K);v= 550x10-6 m2/s, K= 25.3x10-3Wm.K, Pr=5400.

NuL-- 0.664P(t/3 ReLo 5 for Laminar flow, T*.:const, Re"-- 5x l0s

Nu*= g.3rrt.t" *e10 s for Laminar flow, T*:const, Re*ti 5x 10i

45.' A plane wall is a composite of two materials, A and B. The wall of material A (k : 75 Wm I() has

uniform heat generation 1.5 xl06 Wmt, and thickness 50 nm.The wall material B has no generation with(k = 150 W/m K) and thickness 20 mm. The inner surface of material A is well insulated, while the outer

surface of material B is cooled by a water stream with 30"C and heat transfer coefficient 1000 Wm2 K.

l. Sketch the temperature distribution that exists in the composite under steady-state conditions.

2. Determine the maximum temperature Z, ofthe insulated surface and the temperature ofthe

cooled surface I..

Itxlllation

l.g .)a t[ 6 :,1:i1l

75 W/m .K

O6: A rod containing uniform heat sources per unit volume q is connected to two temperatures as shown

in Figure below. The rod is also exposed to an environment with convection coefficient ft and temperature

L. Obtain an expression for the temperature distribution in the rod.

T = 3oo C

h= 1oO0 W/m? K

ttllr:li.Water

.l* = o

K= 150 W/m LB

(=K=

----l * l*-

University of Technology-Electromechanical Engineering Dept.Final Exam 2012-2013

Class:2ndSubject: Electrical MachineExaminer:Dr. Shereen Faik,Dr.AbdulJabbar Oq'aid

Time: 3 hoursDate:Note:

Name: Signature

Note : Answer only five questions. (60 mark)

Ql. (a). For shunt DC generator draw :

1. The equivalent circuit. 2. The open circuit characteristics.3. The external characteristics. (6 marks)

@nor Separately - Excited DC motor draw:1.The equivalent circuit.3. N/[" characteristics.

2. T/I" cha racteristics.(6 marks)

9L A 4 pole, long shunt, compound generator supplies 100A at aterminal voltage of 500V. If the armature resistance is 0.02 O , seriesfield resistance is 0.04 O and shunt field resistance 100 O. Find thegenerated e.m.f. Take drop per brush as lV. Neglect armature reaction.

(12 marks)

O3. ,q, dc series motor takes 40A at 220Y and runs at 800 r.p.m. If thearmature and lield resistances are 0.2 (l and 0.1 O respectively and theiron and friction losses are 0.5KW, find the torque developed in thearmature and the output of the motor, (12 marks)

Q4. (a). Draw the connection of three phase transformer which isused in industrial application. (3 marks)(b). fnu efficiency of a 200KVA , single phase transformer is 98%o

when operating at full load 0.8transformer is 2000 W. Calculate :

(2) Half load copper losses.(3) Efficiency half load.

lagging p.f. the iron losses in the(1) Full load copper losses.

(9 marks)

Q5. ,q. 3- phase 500 V, 50IIz, Induction motor with 6 poles develops

20 hp. at 950 RPM with a power factor of 0.86. The mechanical losses

total (1 hp). Calculate for this load (a) the slip (b) the rotor copper

losses, (c) the input if the stator losses total 1500W (d) the line current'(12 marks)

Q6. I 50 Hz, 8- pole lnduction motor has a

rotor resistance and reactance are 0.01 O,

respectively. Find the ratio of the maximum tospeed at which the maximum torque occurs.

full- load slip 4Yo. Theand 0.1 O per phasefult load torque and the

(12 marks)

Good Luck

University of Technolog'Electro-mechanical Engineering Dept'

Finai Exam.2O12'2013 samPle (2)

Class: 2no YearSubject: blectricai Measurements & Devices J F

Time: 3 HrslJale: ; r .ivljNote: Answer five Questions

No. S

Ql: A) A basic D' Arsonval movement, with an intemal resistance of 50o and sensitivity of 500c)/V

iJto be used as a multi-range voltmeter. Desigrr the series string of multipliers to obtain the voltage

ranges of0-10 V, 0-50 V, O-iOo V, and 0-500 V. 6M

B) check the correctness ofthe following equation using dimensional analysis:

nz=n, (t + s AT); Where,R=resistanci,o=resistancetemperature coefficient in / oC. 3M

Cj wftut ir ttt" construction of measurement system? 3M

e2: A) In a Wien bridge, the ratio arms consist of 2000 and l00Q respectively. Opposite of the latter

is-a resistance of l00O L series with a capacitance of 0.01pF. if the bridge frequency is 796 Hz' Find

Ge capacitance and shunt resistance of thJimpedance in the fourth arm' 6M

B) Arswer the followings:l; Differentiate between wattmeter and energy meter.

2j Chssiff systematic error. 6M

Q3: A) A set of voltmeter readings were taken by five observers as 99.7, 99.8, 100.0, 100.2, and

i00.3. ialculate; a) the arithmetic mian ofvoltage, b) the average deviation, c) the standard deviation.6M

B) Total harmonic distortion measured by fundamental sup-pression harmonic analyzer is 0.1 percent'

The second, third, and fourth harmonics have r.m.s values of0.1, 0.5 and 0.3 volt respectively' Find the

r.m.s value of the fundamental signal. 4M

C) Where do we apply a time- Base sigral in C.R.O? 2M

Qa): A) the resistance Rp, connected in the bridge circuit of a difference amplifier of electronic

uofti""to is l5KO each. The value ofRp is muoh smaller than the value of ac drain resistance ra, ofFETs. The fians-conductance of FETs is 0.005mho. The meter has a resistance of 18004 and a full

scale cunent of 3mA. What voltage must be applied to the gate of left hand FET to produce a full scale

current, ifthe gate ofright handed FET is grounded? 4M

B) Write short notes on the following:l -'Strip chart recorder, 2- Clamp On meter (average responding ac meters)' 8M

Q5: A) Three dc voltmeters are comected in series across 120 volt dc supply. The voltmeters are

slecifiei as follows: voltneter A: 100v, 5ma; voltmeter B: 100 volt, 250 ohms per volt; voltmeter c:tiOOOO, lgma. a) What is the O- per volt rating of voltmeter A? b) What is the full soale current rating

of voltmeter B? What is the voltage rating of voltmeter C? What voltage does each meter read? 7M

B) State five advantages of digital voltmeter over conventional rype voltmeter' 5M

Continued

Q6: A) A sinusoidar arternating vortage of 220v is applied a cross a moving coii ammerer. athermocouple ammeter' and half w-ave ,".",in". uri.o*.ill in ,..i.r. The rectifieioffers a resisr.anceof 50Q in one direction and infrnite t"ti.--r". in olp}-iiJi.".,ion. cui.uiul",'il j. i"uaing on ,rr"arnmerers. 2- The fcnn fhctor and peak I,acior of rh. ;;*;;;;*".B) What are active and passive transducers? 6M

c) In a variabre capacitance transducer, .the diaphragm 20mm in diameter and 4mm "o*',1"dielectric constant was 10' Ifa pressure produces an"averige deflection of 0.25mm. calculate the valueof capacitance before and ane. itre appricari;#f*,;: d:;erminivity of air is 8.85xr 0-r2 F/m.

4M

GOODLUCK

University of Technology-Electromechanical Engineering Dept.Final Exam-2nd. attempt - 2012-2013

-L:. Time: 3 hrClass: 2nd YearSubject: P in C+-Examiner: Dr.Nazhat S.& Ahmed K.

Date:Note:

Note: Answer Five questions onlY.

Q1.a) Write a program to enter integer variable number equal to

the reference and print the following1 . Value of integer number.2. Vaiue ofthe reference.

3. Address of the reference.

b) Write a program to read the file called "Salary"'

Q2.Write a program to read a number and perform the following:

l Print the number of digits in reverse order'

2. Find the sum of digits.3. Find the average of its digits.

Q3.uj W.it. a program to enter two strings, and then find the following:

1- Insert the second string in the end of the first string'

2- Compare between two strings.

3- Copy second string to first string.

b) Wriie a program to divide two numbers by 2 using function called half.

Q4.u) W.lt. a program to enter three dimensional array a[2]tal[:] contains'

numbertf zeros, then compute the number of zeros using the following

function: int numzeros( int a[ ][4][3],int n1,int n2,int n3).

b) Write and test the average function that retums the average of up to four

oositive numbers:float average ( float x 1 ,float x2=0,float x3:0 , float x4=0)'

o5a) Write a program to arrange an element taken from a finite set using

the following permutation function: long perm ( int n, int k) '

b) Write a program that uses a( for loop) to compute and print the sum ofa given number of sequences'

Q6.a) Write a prog.ram to open the files called: 1'" Sally" for read mode'

2."Text't for read and write mode' 3' "Student" for write mode, then

close the files.b) Write expression for the following functions:

1. to oPen the file.2. to close the frle.3. to put character in h1e.

66 then enter

U rniu er s itY o f T e chno lo g Y

E le ctr ome c hanic aI D eP ar tment

Chass:2"d

D^tet 4-9-2013

T ime: -3 hr s

Aduance M athemattcs

lrQ(7) Evatuatethetntegral '= ll

t* +yz)dxdv where D ts the regton tnthe first quadrant

D

bound.ed by the x - axts 'the y - clxts and the ctrcle of untt r&dius centl'ed on the ortgtn

Q(2) U se the laplace transf ormatton to solve the coupled dif f erenttal equotion

9-*=o ; **r=1 ;x101 =-1 ;Y(o)=1dt dt

e{3}:- lf z = f (x,y) wtth x =){ut - u') and'y =vv show that

022 d2z ,,,022 , 022,

drr+ dV= \u'+ v-)\67-rdlZ)

Q(4): -Show thot the I unctlon z -- (x - 7)' + (y - 2)2 has one stattonary point only and determLne

its nature. Sketch the s1fff oce representqted by z and produce a contour mqp tn x - y plane

1

0(5) [Y Ot IJsing M aclaurtn's series correct to 3lignificant ftguresJU0

Q(6) Evaluate the the fllowing Integralusing spectal function

III xs(z-x)o dx)0

QQ)Solve the f ollowtng dtf f erenti.al equatinn to eualuate the homogenous

and p artic alur s o lution

)2,, ,1,,

-iJ1Z !!.l10y = szt +20 Giventhatx = 0 , y=0,dx' dx

0(8) Ftrd the Fourier sedes for the fi.ncnon

[-r, -r.: ^!-112I

_/(") =1 a. -1r/2, ^ !Tz.

| ':

l1 /r<x!r

ayrdx3

Q(9) D etermine the ualue o/ (3.039)a correct to 6 significant figures using

the btnomiaL theorem

Good Luck

Dr Muhammad,A,R Yass Dr suad Ali

ll l20:ei6l2013.: ts \- \rL,

:!'F.'!l

2013-20I: u'rlll rL-!l ir)l i-ilr j'sj^! diLh - 4+tt1 .i.,t-rJ.itl

+st]sltg ++!.,r+S -r,l3r ;irL...Ji

:e,!. -+:ll :t.*! t'r :+LLtl f,st

Answer fife questions onlv

Q1) A common-source amplifier using an E-MOSFET isshown in Figure (1). Find V65, Ip, Vps, and the ac outputvoltage (Vout). Assume that for this particular device,Ip1".1 = 200 mA at Vcs = 4 V, V651,1,1 = 2 V. and gm = 23 mS.Vin = 25 mv.

Q2) In Figure (2) for the common-emitter amplifier, V cc = 12 V. Rc = 1.0 kO, and re = 5 O.Forthedarlinglonemitter-follower,Rl--l0kO,F.2=22kf-,RE=22e,RL=gO,Vcc=12V, and Bpg = pac= 100 for each transistor.(a) Determine the voltage gain ofthe common-emitteramplifier.(b) Determine the voltage gain ofthe darlington emitter-follower.(c) Determine theoverall voltage gain .

Figure(2)

Q3) For the network ofFig.3, Draw the smal) signalequivalent circuit, then determine:

(a) re. (b) Rin (d) Av. (e) Ai.

fi;,,,

3 r

Fi,s.(l)

Q4l In the circuit shown in Fig.

find i(t) and iR(t) for t > 0

Q5) Find I1 & 12 for the circuit Fio I

zruv

Q6) Choose the correct ansu,er for (12) ofthe follo\\'ing:

l-Wh ich ofthese is not a required condition for a balanced system: /a) lVanl:lVbn=Vcni (b) Ia+Ib+lc =0 (c)Van+ n+Vcn =0 (d) Source voltages are 120 out ofphase with each other. (e) Load impedances for the threephases are equal.

4.ln a A - A system, a phase voltage of 100 V produces a line \ oltaee of: (a) 58V (b) 7rv

shown in

l-.-L-L--+

l.r<-

€4<a1

l73V (e) l41V

5- For an oscillator to properly stan. the gain around the Feedback loop must initially be: a- oncc- greater thar one d- equal to B.

6-A phase shift oscillator has: a- three RC circuits b- three LC circuits c. aT-qpc circuit

(c) l00v (d)

b- less thar one

d- n-type circuit

7- The differenc€ between the half-power frequencies is called the: (a) qualiry factor (b) rcsonanl frequency (c)bandwidth (d) cutofl frequency

8- When port I of a two-port circuit is short-circuited, Ir = 4 12 and V2= 0.25 lr. Whichof the follorving is true? (a)y11=4 (b) y1r=16 (c) yr1-16 (d) y2= 0.25

9. What kind of filter can be used to select a signal ofone particular radio station?highpass (c) bandpass (d) bandstop

(a) lowpass (b)

10. In a certain oscillator. Av = 50. The attenuation ofthe feedback circuit must be a)l (b)0.01 (c)10 (d) 0.02

I l. The outpul of a certain two-supply class-B push-pull amplifier has a Vcc of 20 V. If the load resistance is 50 Qthe value oflc(sat) is: (a) 5 mA (b) 0.4 A (c) 4 mA (d) 10 nlA.

12. Colpitts, and Hart]ey are names that rcf'er to (a) 1-vpes ofRC oscillators (b) invcntors ofthe transistor (e) qpes ofLC oscillators. D) types of filters

13. One condition for oscillation is: (a) no gain around the feedback loop. (b) a gain of I around the feedback loop(c) the aftenuation ofthe feedback circuil rnust be one-third (d) the fecdback circuit must be capacitive

2,,= 6JL(,2,-Sun221 =-)4Z"c"9t

GOOD LUCK