EASA Module 4 (Club66) Questions

7/26/2019 EASA Module 4 (Club66) Questions

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Module 4 Exam 1Electronic Fundamentals

1. What gives the colour of an LED?a) The lastic it is encased in!) The active elementc) The t"e of gas used inside it

#. $ germanium diode is used fora) rectification!) voltage sta!ili%ationc) modulation

&. Wh" is a diode ut in arallel 'ith an LED?a) To rotect it from $(!) o it 'ill 'or* onl" a!ove a certain voltagec) o it 'ill 'or* onl" !elo' a certain voltage

4. When testing the for'ard !ias of a diode 'ith a multimetera) the ositive lead of the ohmeter is laced on the cathode

!) the ositive lead of the ohmeter is laced on the anodec) it does not matter 'hich terminal the ositive lead of the ohmeter is laced

+. ,n an -- transistor the is thea) collector!) !asec) emitter

/. The outut of a tachogenerator isa) roortional to seed of rotation!) roortional to osition

c) roortional to acceleration

0. $( o'er is sulied toa) torue receiver onl"!) torue transmitter onl"c) !oth the torue receiver and torue transmitter

2. This is a diagram of [ref to attached diagram]a) a T3,$(!) an (3c) a chott*" diode

. 5o' is a (6 rotected after manufacture?a) With non7conductive varnish!) With 'axc) 6" conformal coating

18. $ differential s"nchroa) can onl" !e used as a transmitter!) can onl" !e used as a receiverc) can !e used as either a transmitter or a receiver

Module 4 Exam #

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1. What is this circuit? [ref to attached diagram]a) 5alf 'ave rectifier!) Full 'ave rectifierc) Fl"'heel diode

#. Differential s"nchros havea) a transmitter onl"!) a receiver onl"c) a transmitter and a receiver

&. ,n an integrated circuit: the comonents are mounteda) !" means of 'ires connecting them!) !" metal oxide filmc) !" metal scre's

4. This s"m!ol is [ref to attached diagram]a) a diode

!) a triacc) a transistor

+. 9ne characteristic of the emitter follo'er isa) lo' resistance outut!) lo' current amlificationc) high voltage amlification

/. $ reduction from the otimum setting of the velocit" feed!ac* in a servo loo could causea) lo' servo gain!) insta!ilit"

c) slo' resonse

0. ,n a torue s"nchro s"stem: the o'er sul" is connected toa) the rotor 'indings of the transmitter onl"!) the rotor 'indings of !oth the transmitter and receiverc) the stator 'indings of the transmitter

2. The hase difference !et'een the sulies of a t'o hase induction motor is

a) 128o

!) 8o

c) 8o

. To reduce overshoot errors in a s"nchroa) the s"stem 'ill have osition feed!ac*!) the s"stem 'ill have velocit" feed!ac*c) the gain of the amlifier is increased

18. $ s"nchro transformer is used toa) derive an error voltage from a s"nchro transmitter signal and a shaft osition!) o!tain a #/ volt $( referencec) add the outut of t'o s"nchro transmitters

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Module 4 Exam +Electronic Fundamentals

1. This is a diagram of a [ref to diagram]a) differentiator!) integratorc) adder

#. 3eversal of the comlete o'er to a torue s"nchro s"stem 'illa) have no effect!) cause reverse rotation of the receiver rotor

c) dislace the receiver rotor !" 128o

&. The o'er sul" to a torue s"nchro s"stem isa) $(!) D(c) $( or D(

4. This s"m!ol is [ref to attached diagram]a) an LED!) a laser diodec) a hotodiode

+. When a ositive voltage is alied to the !ase of a normall" !iased n77n common emitter amlifiera) the emitter current decreases!) the collector voltage goes less ositivec) the !ase current decreases

/. $n amlifier current gain 'ill !e slightl" less than 1: !ut its voltage gain 'ill !e high: if it is connected in thea) common !ase configuration!) common emitter configuration

c) common collector configuration

0. $n oen loo s"stem is one 'hich hasa) no direct feed!ac* loo!) rate feed!ac* looc) osition feed!ac* onl"

2. Mechanical friction in a servo results ina) reduced gain!) increased damingc) increased inertia

. The osition feed!ac* signal isa) in hase 'ith the inut demand signal!) in anti7hase 'ith the demand signal

c) hase advanced !" 8o'ith resect to the inut signal

18. $ servo s"stem that overshoots and oscillates isa) under damed!) over damedc) criticall" damed

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Module 4 Exam /Electronic Fundamentals

1. The o'er sul" to a torue s"nchro s"stem is connected toa) the transmitter stator!) the transmitter rotor onl"c) the transmitter and receiver rotors

#. ,f the rotor of the receiver in a torue s"nchro s"stem 'as revented from aligning 'ith the transmitter rotorthen

a) the transmitter rotor 'ill turn to align 'ith the receiver rotor!) the receiver 'ill overheatc) a high current 'ill flo' in the stator 'indings

&. This is a diagram of a [ref to attached diagram]a) differentiator!) integratorc) adder

4. $ %ener diode

a) sta!ili%es voltage at a redetermined level!) allo's current to flo' in one directionc) acts li*e a s'itch

+. The common collector amlifier is sometimes called the emitter follo'er circuit !ecausea) the emitter current follo's the collector current!) the emitter voltage follo's the !ase voltagec) the emitter voltage follo's the collector voltage

/. ,n a toroidal resistance transmitter indicator s"stem: the o'er sul" is connected toa) the !rushes

!) the resistor sla!c) the rotor

0. When a servo has reached its null and stoed: the velocit" feed!ac* isa) %ero!) maximum and anti7hasec) maximum and in hase

2. The rimar" urose of rate feed!ac* in a ositional servo s"stem is toa) ensure minimum resonse time!) revent excessive overshootc) ensure s"stem linearit"

. ,n an $( rate servo: a stead" inut 'ill result in the servomotora) oscillating a!out a ne' datum!) rotating at a constant seedc) rotating to a ne' datum osition

18. $n E@, !ar outut at datum hasa) no induced voltage in the secondar" 'indings!) an im!alance of voltages in the secondar" 'indingsc) eual and oosite voltages induced in the secondar"

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1. $ non7inverting o7ama) has a non7inverting inut and an inverting outut!) has an inverting inut and a non7inverting oututc) a non7inverting inut connection onl"

#. $mlifiers ma" !e classified as

a) common emitter or common collector amlifiers!) voltage amlifiers or imedance amlifiersc) voltage amlifiers or o'er amlifiers

&. What is a shott*" diode used for?a) Aer" high freuenc" alications!) ta!ilsationc) 3ectification

4. The result of cross connecting t'o of the transmission leads in a torue s"nchro s"stem and then turning

the rotor of the transmitter /8ocloc*'ise 'ould !e

a) the receiver 'ould move /8ocloc*'ise

!) the receiver 'ould move 1#8oanticloc*'isec) the receiver 'ould move /8o anticloc*'ise

+. The control 'indings of a t'o hase servomotor is sulied 'ith $( voltage ofa) constant amlitude!) varia!le hasec) varia!le amlitude: varia!le hase

/. ,n a torue s"nchro that includes a differential s"nchro the o'er sul" is connected toa) the transmitter rotor onl"!) the transmitter and receiver rotors onl"c) all three rotors

0. $ differential s"nchro rotor hasa) three 'indings!) t'o 'indingsc) one 'inding

2. ,f the rotor of a control s"nchro stic*sa) the s"stem hunts!) high current 'ill flo'c) the osition feed!ac* 'ill oscillate

. With the reversal of the connections to the rotor of the transmitter of a torue s"nchro: the osition of the

receiver rotor 'ill !ea) unchanged

!) changed !" 1#8o

c) changed !" 128o

18. The alication of a =stic*7off= voltage to a control s"nchro servo s"stem isa) to overcome the effect of static friction!) to overcome the effect of viscous frictionc) to revent alignment to a false null

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1. When removing a microrocessora) no damage is done !" static discharge!) considera!le damage can !e done !" static dischargec) ensure the o'er is 9FF to avoid static discharge

#. $n amlifier can rovide !oth voltage gain and current gain 'hen it is connected in the

a) common !ase configuration!) common emitter configurationc) common collector configuration

&. 5o' do "ou increase voltage gain of an amlifier?a) decrease !ase circuit !ias!) decrease inut resistancec) increase inut resistance

4. ,n a resolver s"nchro the stator 'indings are electricall" dislaced !"

a) 8o

!) 1#8o

c) 128o

+. $ servo s"stem ma" include a !ra*e: an automatic trim s"stem is one examle 'here a !ra*e is used. The!ra*e is

a) alied during trimming to revent oscillations a!out the demand osition!) alied 'hen trimming is comlete to revent sta!ili%er creec) alied during trimming to revent servo runa'a"

/. $ resolver s"nchro outut is o!tained from a rotor 'itha) one single coil

!) three coils at 1#8o

c) t'o coils at 8o

0. ,n a control s"nchro the stator current ceases to flo' 'hena) the (T rotor is at null!) 'hen the t'o rotors are alignedc) 'hen o'er is removed

2. ,n a seed control servo s"stem Brate control): the urose of the tachogenerator isa) to ma*e the velocit" roortional to servo demand!) to ma*e the deflection roortional to servo demandc) to ma*e it run at constant seed

. The result of reversing the rotor connections to the receiver of a torue s"nchro s"stem is that the roto

ositiona) is unchanged

!) is changed !" 1#8o

c) is changed !" 128o

18. The rotor of a torue s"nchro indicator isa) sulied 'ith an excitation voltage!) short circuitedc) connected in series 'ith the transmitter stator coil

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Module 4 Exam Electronic Fundamentals

1. When a hole diffuses from a 7region to the n7region ita) !ecomes a minorit" carrier in the n7region!) lo'ers the otential !arrierc) raises the otential !arrier

#. 5o' are the ins num!ered on an o7am ,(?

a) counter cloc*'ise from the dot!) cloc*'ise from the dotc) from left to right from the dot

&. To increase the outut of a servo amlifier: it is necessar" toa) reduce the tacho feed!ac*!) increase the tacho feed!ac*c) increase the osition feed!ac*

4. $ngular dislacement of the control coils 'ith resect to the reference coils in a t'o hase induction motoare

a) 8o: 128o

!) 8o: #08oc) 8o: 1#8o

+. a t'o hase induction motor used in a servomechanisma) 'ill al'a"s reuire a starter!) is self starting under light loadsc) runs 'ith no sli

/. $ servomotor having onl" a tachogenerator as a feed!ac* device 'illa) var" its seed 'ith inut error voltage!) have a constant seed for an" given inut voltagec) null out at a osition deendant uon inut error voltage

0. $ h"steresis servo motor is used in a servomechanism !ecausea) it has good starting characteristics!) good seedCvoltage relationshic) lo' inertia

2. The null osition of a torue s"nchro s"stem is 'hena) the T and T3 rotors are arallel to each other

!) the T and T3 rotors are 8oto each other

c) the T and T3 rotors are 1#8oto each other

. 3eversal of t'o of the stator connections on a torue s"nchro receiver 'ould cause

a) the transmitter to !ecome the receiver!) the outut to move the same direction as the inutc) the outut to move the reverse direction to the inut

18. $n $( tachogenerator stator has

a) t'o 'indings 128oaart

!) three 'indings 1#8oaart

c) t'o 'indings 8oaart

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1. $ >unction diodea) has one 7n >unction!) is similar to a vacuum diode !ut cannot rectif"c) can handle onl" ver" small currents

#. When the rotor of an $( tachogenerator is stationar": the rotor hasa) no circulating currents!) lo' circulating currentsc) no magnetic fields

&. The outut of a tachogenerator should !ea) sinusoidal!) exonentialc) linear

4. With a constant inut to a seed control servo: the servo motora) moves to a certain osition

!) moves at a constant seedc) oscillates: !ut other'ise does not move

+. $ closed loo servomechanisma) must onl" have osition feed!ac*!) must have !oth osition and velocit" feed!ac*c) can have either osition or velocit" feed!ac*

/. (ritical daming in a servomechanism isa) the oint 'hich allo's >ust one overshoot !efore the load comes to rest!) the amount of daming that results in the load >ust not oscillating

c) the critical daming reuired for the otimum daming of the servomechanism

0. ,n a control s"nchro s"stem the o'er sul" is connected to thea) transmitter rotor and amlifier!) receiver rotor and amlifierc) transmitter and receiver rotors

2. 3everse rotation of a control transformer rotor can !e caused !"a) connections !et'een the transformer rotor and the amlifier reversed!) connections to the transmitter rotor reversedc) short circuit !et'een t'o transmission lines

. Aelocit" feed!ac*a) ooses the demand inut!) assists the demand inutc) revents dead sace errors

18. Aelocit" lag can !e decreased !"a) introduction of an integrator!) *eeing the error detector Bsumming oint) outut as lo' as ossi!lec) decreasing the coulom! friction in the s"stem

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1. The >unction !arrier offers oosition to onl"a) holes in the 7region!) free electrons in the n7regionc) ma>orit" carriers in !oth regions

#. $n increase in velocit" feed!ac* 'ill

a) decrease the seed the load moves!) increase the seed the load movesc) have no effect on seed

&. $ t'o hase motor 'ill sto 'hena) the reference hase is reversed!) the control hase is reversedc) the control hase is %ero

4. $ tachogenerator outut isa) varia!le freuenc": constant voltage!) varia!le voltage: constant freuenc"c) varia!le freuenc": varia!le voltage

+. 3ate feed!ac* can !e o!tained from aa) s"nchro!) tachogeneratorc) otentiometer

/. ositional feed!ac* can !e o!tained from aa) s"nchro!) tachogeneratorc) otentiometer

0. The frictional force in a servomechanism that is roortional to seed is called

a) stiction!) coulom! frictionc) viscous friction

2. The =null= oint in a control s"nchro is 'hen the t'o rotors are

a) at 8oto each other!) arallel to each otherc) 'ired in series

. ,f t'o of the stator leads are cross connected in a control s"nchro s"stem: a #+o cloc*'ise rotation of theinut rotor 'ould result in the outut rotor

a) moving #+ocloc*'ise

!) moving #+oanticloc*'ise

c) moving 128oto rectif" the defect

18. Daming in a servomechanism is easier to al" ifa) the mechanism is light and has lo' inertia!) the mechanism is heav" and has high inertiac) the mechanism is light and has high inertia

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Module 4 Exam 1#Electronic Fundamentals

1. 3everse !iasa) lo'ers the otential !arrier!) raises the otential !arrierc) greatl" increases the ma>orit" carrier current

#. ,f the electrical connections to the feed!ac* generator in a control s"nchro s"stem 'ere disconnected: thea) motor 'ould run in the 'rong direction!) inut signal to the amlifier 'ould reducec) s"stem 'ould tend to oscillate

&. $n increase in servo amlifier gaina) reduces the seed of the s"stem!) increases s"stem resonsec) reduces tendenc" to hunt

4. ,n a control s"nchro the stator current ceases to flo' 'hen thea) (T rotor is at null

!) t'o rotors are alignedc) o'er is removed

+. The term =velocit" lag= refers to aa) seed error!) osition errorc) acceleration error

/. The rotor of an $( tachogeneratora) has s*e'ed slots!) has a coer: !rass or aluminium c"linder

c) rotates at constant seed

0. $ servo s"stem 'ith transient negative velocit" feed!ac*a) is damed 'ith little velocit" lag!) is damed 'ith high velocit" lagc) is underdamed 'ith high velocit" lag

2. To reverse the direction of rotation of a t'o hase induction motora) reverse the olarit" of the control hase!) reverse the olarit" of !oth the control hase and reference hase

c) shift the reference !" 8o

. ,n a rate servo Bseed control) the signal into the servo amlifier isa) inut voltage lus tachogenerator outut!) inut voltage minus tachogenerator oututc) inut voltage lus osition feed!ac* voltage

18. Loss of D( to a servo amlifier causes the motor toa) run continuousl"!) stoc) reverse

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Module 4 Exam 1&Electronic Fundamentals

1. $valanche !rea*do'n occurs 'hena) for'ard current !ecomes excessive!) for'ard !ias exceeds a certain valuec) reverse !ias exceeds a certain value

#. $n $( servo demand can !e converted to drive a D( motor !" the introduction of a

a) rectifier!) modulatorc) demodulator

&. "nchro indicator s"stems are used 'hen the indication is reuired to movea) a fraction of the inut distance!) slo'er than the inut ratec) at the same rate as the inut

4. $ linear varia!le differential transformer is used to measure osition feed!ac* 'here

a) &/8oof rotation and high angular accurac" is reuired!) accurac" is of limited imortance !ut ro!ust construction and relia!ilit" is imortant

c) an outut 'hose hase is related to direction of movement and amlitude linear over a 'ide range

+. $ lo' freuenc" sinusoidal inut 'ill cause a closed loo servomechanism load toa) move to a demand osition 'ith no overshoot!) move !ac*'ards and for'ards at the inut freuenc"c) move to the demand osition and then return to the datum osition 'ithout an" overshoot

/. To reduce oscillations a!out a demand ositiona) the amount of velocit" feed!ac* 'ould !e decreased!) the amount of velocit" feed!ac* 'ould !e increasedc) the amount of osition feed!ac* 'ould !e increased

0. ,f a servo amlifier is suffering from drifta) the load 'ould move to a ne' osition: roortional to the drift and sta" there!) the load 'ould move to a ne' osition: roortional to the drift and then return !ac* to the datum

ositionc) the load 'ould oscillate a!out the datum osition

2. ,n a transient velocit" feed!ac* circuit: the tachogenerator outut is summated 'ith the demand voltagea) onl" 'hen the load is slo'ing do'n!) at all times 'hen the load is movingc) onl" 'hen the load is seeding u or slo'ing do'n

. ositive feed!ac* alied to a servomechanisma) decreases the resonse of the s"stem!) ooses the demand signalc) increases the resonse of the s"stem

18. $ differential s"nchro rotor consists ofa) one 'inding arallel to the transmitter rotor

!) t'o 'indings at 8o aart

c) three 'indings at 1#8oaart

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Module 4 Exam 1+Electronic Fundamentals

1. The inut and outut signals of a common emitter amlifier area) eual!) out of hasec) in hase

#. The outut of a resolver s"nchro is

a) deendant uon the osition of the rotor onl"!) roortional to the seed of inut rotationc) a function of the rotor osition and excitation voltage

&. The rotor of an autos"n osition indicating s"stem isa) a ermanent magnet!) an electromagnetc) sring controlled

4. $ !and ass filter excludes freuenciesa) a!ove the freuenc" reuired onl"!) !elo' the freuenc" reuired onl"

c) a!ove and !elo' the freuenc" reuired

+. The rotor of a magnes"n transmitter isa) a dc electromagnet!) a ermanent magnetc) an ac electromagnet

/. ,n general the accurac" of a s"nchro s"stem increases if thea) stator current is high!) stator current is lo'c) rotor current is high

0. Torue s"nchro s"stems are normall" used 'hen thea) mechanical load is lo'!) mechanical load is highc) s"stem accurac" is of extreme imortance

2. ,n a resolver s"nchro the stator 'indings are electricall" disosed !"

a) 8o

!) 1#8o

c) 128o

. The induced signal in the outut coils of the magnes"n s"stem

a) de7saturates the soft iron core!) dams the ointer oscillationsc) is of a value of 288 5%

18. The direction of the induced Bsecondar") magnetic field in a s"nchro transmitter

a) is 8oto the rimar" magnetic field!) in the same direction as the rimar" fieldc) is in the oosite direction to the rimar" field

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Module 4 Exam 1/Electronic Fundamentals

1. The cogging effect in s"nchros is rectified !"a) using car!on !rushes!) using an ellitical cogc) s*e'ing the rotor

#. $ transistor is said to !e in the uiescent state 'hena) no signal is alied to the inut!) it is un!iasedc) no currents are flo'ing

&. ,n an un!iased 7n >unction: current flo' isa) due to the diffusion of minorit" carriers onl"!) %ero: !ecause no charges are crossing the >unctionc) %ero: !ecause eual !ut oosite currents are crossing the >unction

4. 3eversal of the o'er sul" to either the transmitter or the receiver of a torue s"nchro s"stem 'ould

a) cause a 128odislacement !et'een the transmitter and the receiver!) have no effect on the indication: !ut 'ould cause a heav" current to flo'c) ma*e the receiver rotor rotate in the oosite direction

+. Torue s"nchro s"stems are normall" used 'hen thea) mechanical load is lo'!) mechanical load is highc) s"stem accurac" is of extreme imortance

/. $ common !ase transistor circuit is so called !ecausea) the !ase region is located !et'een the emitter and collector region!) the !ase is n7t"e material

c) the !ase is common to the emitter and collector circuits

0. What device transfers one energ" t"e to another?a) Transmitter!) Transducerc) Transonder

2. Which 'a" does conventional current flo' in a - >unction?a) (ollector to emitter!) Emitter to !asec) (ollector to !ase

. Electrical o'er is sulied to a s"nchro rotora) directl"!) through sli ringsc) through a commutator

18. The urose of a fl"'heel incororated in a s"nchro is toa) increase the driving force!) revent oscillationsc) revent insect ingress

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1. ,n an oerational amlifier: the t'o inut 'aves are the same amlitude: same freuenc": !ut exactl" anti7 hase. What 'ould the outut !e?

a) Dou!le!) eroc) 5alf

#. $ th"ristor has 'hich of the follo'ing?a) 5igh resistance 'hen s'itched on!) 5igh resistance 'hen s'itched offc) $ ositive temerature coefficient

&. 9n an integrated circuit the hole in the to left corner is in 1. The ins are counteda) cloc*'ise!) anticloc*'isec) from left to right

4. With reference to the circuit sho'n !elo': ho' is the transistor configured? [ref to attached diagram]

a) (ommon emitter!) (ommon collectorc) (ommon !ase

+. ,n the circuit diagram a!ove: 31 and 3# are used toa) set the transistor gain!) set the D( !ias levelc) increase the !ase voltage

/. ,n a s"nchro s"stem: if t'o stator lines are crossed the receiver 'illa) not !e affected

!) !e 128ooutc) reverse direction

0. ,n the follo'ing 6oolean alge!ra statement: 'hich gate is descri!ed? F ; $ < 6 < (a) 9r!) -otc) $nd

2. ,n an E and , signal generator at datum: the voltage on the secondar" 'indingsa) are eual and oosite!) is maximum

c) is %ero

. ,n a s"nchro resolver: the stator coils are at 'hat angle in relation to one another?a) 4+ degrees!) 28 degreesc) 8 degrees

18. ,n a s"nchrotel: thea) rotor coil is fixed and the stator coil moves!) rotor coil and stator coil is fixedc) stator coil is fixed and the rotor coil moves

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1. 9n a (6: a decouling caacitor is used to get rid of transient currents !et'een 'hich oints?a) The electronic circuit and the aircraft ground!) ,ntersaced along the circuitc) The negative rail and the rest of the circuit

#. What does the circuit sho'n !elo' do? [ref to attached diagram]a) Full 'ave rectifier!) Aoltage dou!lerc) 5alf 'ave rectifier

&. ,n an LED: 'hat is used to ma*e the colour?a) The doing material!) The electronsc) The lastic lens cover

4. $n atom 'ith + electrons in its outer shell is art ofa) an - t"e material

!) a t"e materialc) a ( t"e material

+. ,n a FET: the >unction connections are calleda) drain: source and gate!) !ase: collector and emitterc) drain: collector and >unctions

/. ,n the 6oolean alge!ra statement !elo': the gate descri!ed is F ; $.6.(a) -and!) -or

c) $nd

0. With a small amlitude voltage: 'hat t"e of diode 'ould "ou use to roduce the outut 'aveform?[ref to attached diagram]

a) hott*"!) unnc) ener

2. $n increase in negative feed!ac* to the servo amlifiera) increases amlifier sta!ilit"!) decreases amlifier sta!ilit"c) has no effect

. 5o' is a ush7ull transistor arrangement connected?a) emitter to emitter!) collector to collectorc) !ase to !ase

18. Thermal runa'a" in a transistor is caused !"a) excessive heat causing maximum current flo'!) excessive heat causing minimum current flo'c) lo' heat causing minimum current flo'

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1. $ single integrated circuit: 9 $m has ho' man" ins?a) 4!) 0c) 2

#. What is the outut of the amlifier sho'n !elo'? [ref to attached diagram]a) 8A!) &Ac) +A

&. $ th"ristor is commonl" used fora) voltage regulation!) overvolts regulationc) rectification

4. $ diode 'hich emits hotons 'hen conducting is aa) %ener

!) varactorc) light emitting

+. $valanche !rea*do'n occurs 'hena) for'ard !ias !ecomes excessive!) for'ard !ias exceeds a certain valuec) reverse !ias exceeds a certain value

/. The electrodes of an (3 area) anode: cathode: source!) source: drain: gate

c) gate: cathode: anode

0. What gives an LED its colour?a) $ gas!) The coverc) (omosition and imurit" of the comound

2. For conduction of a transistor the emitter >unction isa) f'd !iased!) reverse !iasedc) f'd or reverse as aroriate to the inut signal

. ,n a - transistor 'hich 'a" does conventional current flo'a) !ase to emitter!) collector to emitterc) emitter to collector

18. ,nfinite gain: infinite inut imedance @ %ero outut imedance is characteristic of aa) (lass $ am!) (lass 6 amc) 9 am

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Module 4 Exam #8Electronic Fundamentals

1. For'ard voltage of a silicon diode isa) 8./A!) 8.#Ac) 1./A

#. $n advantage of a common emitter isa) it is a voltage follo'er!) it has high o'er gainc) it has high voltage gain

&. What amlifier is !iased at cut offa) $!) 6c) (

4. When testing a transistor 'ith an ohmmeter: 'hat is the resistance of the emitterCcollector?a) 5igh resistance one 'a"

!) 5igh resistance !oth 'a"sc) Lo' resistance !oth 'a"s

+. What is the t"ical volts dro across an LEDa) 1./A!) 8.#Ac) 8.4A

/. What diode gives off light hotons 'hen for'ard !iaseda) LED!) hott*" diode

c) unn diode

0. $ logic circuit 'ith more than one gate 'ill havea) one of # states of logic outut!) # or more oututsc) an analogue outut

2. This is a diagram of [ref to attached diagram]a) an (3!) a transistorc) a hoto diode

. ,n a s"nchro: 'hat is used to convert signals from one form to another?a) Transmitter!) Transducerc) Transformer

18. (omonents on an integrated circuit area) in the solid!) don=t need themc) on the surface

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1. What diode is used to sto o'er si*es in a coil?a) T'o directional %ener diode!) hott*" diodec) unn diode

#. The anode of a diode is connected to a


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Module 4 Exam ##Electronic Fundamentals

1. $ >unction diodea) has one 7n >unction!) is similar to a vacuum diode !ut cannot rectif"c) can handle onl" small currents

#. $ germanium diode is used fora) voltage sta!ilisation!) rectificationc) signal detection

&. $ germanium diodea) has a lo'er for'ard !ias voltage than a silicon diode!) has a higher for'ard !ias voltage than a silicon diodec) has the same for'ard !ias voltage as a silicon diode

4. a AL,( hasa) less than 1888 gates

!) more than 1888 gatesc) more than 18:888 gates

+. $ momentar" inut at the reset inut of a fli flo 'illa) reset the true outut to 8!) reset the true outut to 1c) cloc* in ne' data from the data inuts

/. Which t"e of fli flo has onl" 1 data inuta) 3!) GH

c) D

0. $ lo' ass filter hasa) a caacitor in series and an inductor in arallel!) a caacitor in arallel and an inductor in seriesc) !oth caacitor and inductor in arallel

2. When "ou use an o am as a !uffer it hasa) high inut imedance and lo' outut imedance!) lo' inut imedance and high outut imedancec) the same inut an outut imedance

. What s'itches off a th"ristor?a) 3emove the gate voltage!) 3emove sul" voltagec) 3everse !ias gate

18. When an (3 is s'itched on it hasa) high resistance!) lo' resistancec) no change in resistance

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Module 4 Exam #&Electronic Fundamentals

1. What is reuired for the s'itching of a monosta!le multivi!ratora) one trigger ulse to s'itch on and another to s'itch off!) one trigger ulse to !oth s'itch on and offc) one trigger ulse to s'itch on and t'o trigger ulses to s'itch off

#. $ transistor at saturation hasa) high resistance!) lo' resistancec) %ero resistance

&. $ caacitor resistor couled multistage am letsa) $( and D( ass to the next stage!) $( ass onl"c) D( ass onl"

4. $n oscillator oerating at its natural freuenc" has feed!ac* 'hich isa) inhase

!) 8 degrees out of hasec) 128 degrees out of hase

+. What t"e of diode 'hen for'ard !iased holes and electrons recom!ine roducing hotons?a) gunn!) LEDc) hotodiode

/. What t"e of ulse is reuired to s'itch on a (3a) ositive!) negative

c) ositive and negative

0. Which mathematical oeration is erformed !" a modulator amlifier?a) $ddition!) u!tractionc) Multilication

2. What is meant !" a !ista!le circuit?a) The circuit has # sta!le states and 'ill sta" in 'hich one it is ut!) The circuit has # sta!le states and 'ill sta" in !oth at the same timec) The circuit has 1 sta!le state and it can !e negative or ositive

. $ %ener diode is designed to oeratea) a!ove its !rea*do'n voltage!) !elo' its !rea*do'n voltagec) either a!ove or !elo' its !rea*do'n voltage

18. $ GFET isa) voltage sensitive!) current sensitivec) either of the a!ove deending on resistance in the circuit

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Module 4 Exam #+Electronic Fundamentals

1. To chec* the outut of a s"nchro stator it 'ould !e refera!le to usea) an $vometer!) a Aalve Aoltmeterc) a (am!ridge 6ridge

#. "nchro caacitors are connected into s"nchro s"stems toa) minimi%e the torue s"nchro stator current at null!) increase the accurac" of the control s"nchroc) act as sar* suression due to 'ear of the sli rings

&. The urose of the fl" 'heel incororated in a s"nchroa) is to increase the driving force!) to revent oscillationsc) to revent insect ingress

4. ,n a sla! des"nn transmitter thea) ic*7offs form art of the circuit resistance

!) ic*7offs rotate on the sla! resisterc) ic*7offs are connected to a sar* suressor

+. ,f: in a servo s"stem: the amlitude from the feed!ac* s"stem is !elo' normal: the servo 'illa) oscillate!) !e sluggish in oerationc) !e overdamed

/. $ des"nn instrument has a ositive regular increasing error: "ou 'ould ad>usta) lever length!) lever angle

c) lever angle and lever length

0. Torue s"nchro receiver !earing friction 'ill causea) hunting!) misalignmentc) imroved accurac"

2. $ control s"nchro s"stem ointer isa) actuated !" a ermanent magnet!) dislaced !" the torue of the statorc) motor driven

. $ D.(. signal converted to a hase sensitive $.(. isa) demodulation!) hase conversionc) modulation

18. ,f velocit" feed!ac* in a servo s"stem is a!ove otimum: this 'ill causea) sluggish oeration!) huntingc) has no effect

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Module 4 Exam #/Electronic Fundamentals

1. $ device 'hich has a high inut imedance: lo' outut imedance and high voltage gain is aa) (lass $ am!) (lass 6 amc) 97$m

#. ,n an integrated circuit: the comonents are mounted !"a) 'ires connecting them using conformal coating!) a three dimensional rocess 'ith no connections !et'een them reuiredc) metal oxide film etched onto surface

&. For a -- transistor to conduct the collector circuit has to !ea) more ositive than the emitter!) more ositive than the !asec) less ositive than the emitter

4. The amount of rate feed!ac* from a tachogenerator isa) roortional to seed

!) inversel" roortional to seedc) constant for all servo seeds

+. When for'ard !iased: current flo' is mainl" due to thea) ma>orit" carriers!) minorit" carriersc) germanium !ias >unction

/. When for'ard !iased thea) ositive lead is connected to the - t"e and negative to the t"e!) ositive lead is connected to the t"e and negative to the - t"e

c) ositive lead is connected to !oth - and t"e

0. ,n a - transistor: 'hich 'a" does conventional current flo'?a) 6ase to emitter!) (ollector to emitterc) Emitter to (ollector

2. ,n the ener Diode suressor sho'n: oint in resect to oint I should !e [ref to attached diagram]a) more negative!) more ositivec) either ositive or negative

. ,n an integrated circuit: the comonents are inserteda) manuall"!) automaticall"c) !" doing in successive la"ers

18. The t"ical voltage dro across an L.E.D isa) #A!) 4Ac) /A

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1. ,n an electronic circuit 'ith an oerational amlifier connected in the ush7ull configuration: the circuita) decreases imedance!) utili%es !oth sides of the inut signalc) !loc*s half of the inut signal

#. in & on an o7am has a < s"m!ol. This designatesa) ositive offset null!) ositive inut D( inc) non7inverting inut

&. $n advantage of a FET 'hen comared to a !i7olar transistor isa) the inut resistance is lo'er!) the s'itching time is uic*erc) the inut resistance is higher

4. The semiconductor su!strate used in =chis= is most commonl"a) germanium

!) siliconc) hiidide

+. oint comared to oint [ref to attached diagram]a) is more ositive!) I is more negativec) is more negative

/. The t"ical !and'idth for an audio freuenc" amlifier is sho'n !" line [ref to attached diagram]a) !) I

c)

0. What control s"stem is used on an inut that gives a controlled redetermined outut?a) 9en Loo!) (losed Looc) (ontrol ervo

2. ,ncreasing velocit" feed!ac* from otimum 'ill givea) sluggish erformance!) faster erformancec) no change on the outut

. $ rate control servo s"stem 'ith a stead" inut voltage 'ill givea) constant seed!) increasing seedc) decreasing seed

18. Where are decouling caacitors used in digital circuits?a) 6et'een ins 1 @ 2!) (lose to the


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1. What are the ma>orit" carriers for a for'ard !iased - >unction device?a) Electrons!) 5olesc) Electrons and holes

#. The resistance measured using an $A9 !et'een the (ollector and Emitter of a transistor isa) same !oth 'a"s!) smaller (ollector to Emitterc) higher (ollector to Emitter

&. ermanium in its ure state isa) neutral!) ositivel" chargedc) negativel" charged

4. (ommon (ollector has the follo'ing characteristicsa) Medium Aoltage ain: 5igh (urrent ain: -on7,nverted 9utut

!) Lo' Aoltage ain: 5igh (urrent ain: ,nverted 9ututc) Medium Aoltage ain: Lo' (urrent ain: ,nverted 9utut

+. T'o ush7ull transistors have 'hat commoned?a) 6ases!) (ollectorsc) Emitters

/. ,n a (ommon Emitter $mlifier 3E is used fora) !iasing!) sta!ilisation

c) load control

0. ,f the reverse !ias voltage across a diode is too higha) load current increases raidl"!) load current reversesc) load current reduces to %ero

2. The rotor coil of a s"nchrotela) is stationar"!) rotatesc) rotates onl" 'hen a current flo's in it

. $n increase in amlitude of a rate feed!ac* signal 'ill causea) sluggish servo oeration!) reduced huntingc) insta!le oeration

18. $n increase in negative feed!ac*a) increases s"stem sensitivit"!) decreases s"stem sensitivit"c) 'ill ma*e the driven device continuousl" rotate

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Module 4 Exam #Electronic Fundamentals

1. $n integrated circuit is manufactured !"a) comuter hard'are: 'hich use individual circuits on ri!!on!) doing imurities into la"ers of intrinsic materialc) etching coer trac*s onto an insulating !oard

#. $ de7couling caacitor in a (6 is used toa) minimise transient currents!) ass a.c onl"c) ass d.c onl"

&. $ monosta!le vi!ratora) is s'itched on !" a trigger ulse then 'ithin a re7set time 'ill eventuall" return to its original state!) uses a trigger ulse to turn on and the same ulse to turn offc) uses one ulse to turn on and another to turn off

4. osition feed!ac* is used toa) ensure control surface moves to the demanded osition !" the controls

!) to revent control surface oscillations 'hile the surface is !eing movedc) indicate to the ilot the osition of the load

+. The outut from a control transformer isa) torue!) $( voltagec) D( voltage

/. The stator outut voltages from a s"nchro resolver area) D(!) $( single hase

c) & hase

0. The urose of s"nchro caacitors in a differential s"nchro transmission s"stema) to reduce stator current!) reduce rotor currentc) reduce stator circuit imedance

2. $ t"ical use for resolver s"nchros isa) in comass comaritor units!) engine o'er instrumentationc) fl" !" 'ire s"stem

. The urose of a fl"'heel in a s"nchro receiver indicator is toa) revent sinning or oscillation!) encourage sinningc) increase driving torue

18. $ linear variometer isa) a secial s"nchro giving ac outut roortional to shaft angle!) a secial auto transformer for s"nchro s"stem o'er suliesc) an alternative term for a des"nn s"stem

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Module 4 Exam &8Electronic Fundamentals

1. ,n a s"nchrotel the rotating 'inding isa) the stator!) rotorc) neither

#. The receiver rotor in a torue s"nchro s"stem oscillates over an arc of arox 0+ degrees. The ro!a!le

cause isa) short circuit !et'een t'o stator lines!) t'o stator lines reversedc) one stator line oen circuit

&. "nchro caacitors are fitteda) to rovide critical daming!) to ma*e additional daming features unnecessar"c) to imrove sensitivit" and accurac"

4. The outut of a control transformer is madea) hase and amlitude sensitive !" direction and magnitude of the transmitter rotor movemen

resectivel"!) hase and amlitude sensitive !" magnitude and direction of the transmitter rotor movement

resectivel"c) hase sensitive !" transmitter rotor excitation and amlitude sensitive !" direction of transmitter

rotor movement

+. $ transistor is used ina) current amlifier!) voltage amlifierc) !oth

/. $n LED 'hich emits green light uses

a) gallium arsenide hoshide!) gallium hoshidec) gallium arsenide

0. $n LED 'hich emits red light usesa) gallium arsenide hoshide!) gallium hoshidec) gallium arsenide

2. $ hotodiode is oerated undera) reverse !ias conditions!) for'ard !ias conditions

c) reverse or for'ard !ias conditions

. To increase caacitance of a varactor diodea) reverse !ias voltage is increased!) for'ard !ias voltage is decreasedc) reverse !ias voltage is decreased

18. Which diode has a lo'er for'ard !ias voltage?a) silicon!) germaniumc) !oth the same

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1. $ ener diode is used fora) rectification!) voltage sta!ilisationc) voltage regulation

#. ,n the a!ove diagram the hase of the inut to the outut is [ref to attached diagram]a) in hase!) 128 degrees out of hasec) 8 degrees out of hase

&. The a!ove diagram sho's a [ref to attached diagram]a) voltage dou!ler!) half 'ave rectifierc) full 'ave rectifier

4. $ th"ristor (3 is aa) unidirectional device

!) !i7directional devicec) multidirectional device

+. $ !i7directional T3,$( has t'o (3s connected ina) series arallel!) arallel seriesc) inverse arallel

/. $ th"ristor can !e for'ard !iased !"a) ositive ulse!) negative ulse

c) ositive or negative ulse

0. =-= t"e materials are doed 'itha) accetors!) donorsc) accetors and donors

2. $ >unction diode if reverse !iased too far: the outut 'illa) increase!) stoc) reverse

. The inut of this circuit 'ill !e [ref to attached diagram]a) integrated!) differentiatedc) logarithmic

18. The most suita!le class of amlifier for a radio transmitter isa) $!) 6c) (

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Module 4 Exam Electronic Fundamentals

1. nder normal oerating conditions 'ill !e [ref to attached diagram]a) negative 'ith resect to !) ositive 'ith resect to c) negative 'ith resect to I

#. What is the !ase material of a (6?a) ,nsulator!) (onductorc) emiconductor

&. What does the outut voltage of an o7am deend uon?a) The resistors in the circuit!) The o am !and'idthc) The gain of the o7am

4. ,n 'hich direction does the current flo' on a - transistor 'hen for'ard !iased?a) Emitter to collector

!) (ollector to emitterc) Emitter to !ase

+. What does a resolver do?a) 3esolves a osition into sine and cosine comonents!) $dds t'o signalsc) 3esolves a movement into sine and cosine comonents

/. What comonent is used to turn $( to D(?a) Diode!) Transistor

c) Th"ristor

0. What is an intrinsic material?a) 9ne 'ith removed elements!) 9ne 'ith added elementsc) $ ure material

2. What does the colour of an LED deend uon?a) Material!) Aoltagec) (urrent

. ,n an electronic circuit: if the anode of a diode is clamed to ground 'hat is this called?a) $ high level claming circuit!) $ lo' level claming circuitc) $ negative limiting circuit

18. ,f the feed!ac* is ideal damed: the signal 'illa) overshoots once and return !ac*!) oscillatec) not overshoot

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Module 4 Exam &&Electronic Fundamentals

1. The voltage dro of a silicon diode isa) 8.& A!) 8.0 Ac) 1 A

#. The negative feed!ac* for an integrator is connected across aa) resistor!) caacitorc) inductor

&. To decrease the caacitance of a varactora) for'ard !ias should !e increased!) reverse !ias should !e decreasedc) reverse !ias should !e increased

4. ,n a rinted circuit !oard : the surface resistance testing isa) the resistance !et'een the to' inductors

!) insulation resistance !et'een ad>acent rinted conductorc) !et'een the !oard and the conductor.

+. $ ener diode is used across the outut for a o'er sul" circuit toa) give a full 'ave rectification!) rovide a stead" D( voltage outut 'ithout fallingc) revent thermal run'a"

/. ,f a diode has gone oen circuit in a full 'ave !ridge rectifier: the outut freuenc" rile isa) the same as the inut freuenc"!) t'ice the inut freuenc"

c) half the inut freuenc"

0. ,n a tachogenerator the outut voltage isa) inversel" roortional to the seed!) directl" roortional to the seedc) %ero

2. 3esistance 7 caacitance couling !et'een amlifiers givesa) D(!) $(c) !oth

. Which curve is from a 6road!and amlifier? [ref to attached diagram]a) $!) 6c) (

18. To test a diode 'ith a multimeter: the anode lead is laced on thea) cathode and the ositive lead to the anode!) anode and the negative lead to the cathodec) cathode and the negative lead to the anode

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1. $ diode is arallel to an LED in an $( circuit toa) rovide correct amount of current for LED 'hen circuit is s'itched on!) rotect LED from $( current 'hen s'itched onc) revent !ac* EMF in the circuit 'hen LED is s'itched off

#. What t"e of gate has !oth inverted inuts and inverted oututsa) $-D gate!) -$-D gatec) -93 gate

&. $ transistor in (ommon Emitter mode givesa) high voltage gain onl"!) high current ain onl"c) high o'er ain

4. The inut resistance to an inverting o7am is 188 9hms. The feed!ac* resistance is 188 *ilohms. What isthe amlifier gain?

a) 71888!) 1888c) 1C1888

+. For a transistor in common emitter mode: the term 5fe indicatesa) the current gain ,cC,! at Ace constant!) the Aoltage gain AceCA!e at ,! constantc) the o'er gain inCout

/. ,n a full 'ave !ridge rectifiera) the outut is ure D(. Freuenc" is 8 5%

!) the outut voltage is t'ice the inut voltagec) the outut freuenc" is t'ice the inut freuenc"

0. The letter K6K follo'ing the identification code on the case of a s"nchro denotesa) the modification status!) that the stator is rotata!lec) that the s"nchro is second hand

2. ,n a differential amlifier the term =common mode voltage= meansa) outut voltage 'hen !oth inuts have eual voltages!) outut voltage 'ith non7inverting inut at 8 voltsc) outut voltage 'ith one inut connected to common ground

. ,n an ideal current amlifiera) inut imedance must !e lo' and outut high!) inut imedance must !e high and outut lo'c) !oth inut and outut imedances must !e lo'

18. ,n an ideal voltage amlifiera) inut imedance must !e lo' and outut imedance lo'!) inut imedance must !e lo' and outut imedance highc) inut imedance must !e high and outut imedance lo'

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Module 4 Exam &+Electronic Fundamentals

1. The term ,ce related to transistor in common emitter mode meansa) lea*age current flo'ing !et'een (ollector and Emitter 'ith 6ase oen circuited!) for'ard current !et'een (ollector and Emitter 'ith 6ase connected to groundc) lea*age current !et'een (ollector and Emitter 'ith 6ase connected to ground

#. ,n a for'ard !iased diode: current is carried !"a) ma>orit" carriers!) minorit" carriersc) !oth

&. When chec*ing a diode for resistance the ositive lead goes toa) anode and negative lead to cathode!) cathode and negative lead to anodec) anode and negative lead to earth

4. ,n an integrated circuit: active: assive and connecting comonents area) mounted on the outside of the solid !loc*

!) em!edded 'ithin the solid !loc*c) connected !" fine gold 'ires

+. sing Electron flo' in a diode the current flo's froma) anode to cathode!) cathode to $nodec) cathode to !ase

/. The rimar" urose of rate feed!ac* in a ositional servo s"stem is toa) ensure minimum resonse time!) revent excessive overshoot

c) ensure s"stem linearit"

0. ,n a control surface osition indicating s"stem the feed!ac* signal isa) roortional to the control surface osition!) indirectl" roortional to the control surface ositionc) in hase 'ith the control surface osition

2. $fter assing through a rectifier: alternating current !ecomesa) direct current!) ulsating direct currentc) suare 'ave form current

. ener diodes are used fora) (urrent control!) Aoltage controlc) Temerature control

18. Tx is the a!!reviation for aa) torue transmitter!) torue receiverc) control transformer

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Module 4 Exam &/Electronic Fundamentals

1. 9nce started conducting an (3 s'itches offa) automaticall" after a secific time!) onl" 'hen the anode goes ositive to the cathodec) onl" 'hen the anode goes negative to the cathode

#. $ ener diode usuall" 'or*sa) onl" in for'ard !ias!) onl" in reverse !iasc) at varia!le voltages

&. ,n a for'ard !iased diode: electrons leave thea) the anode!) the cathodec) the doed area

4. Diodes area) conductors

!) semi7conductorsc) ,nsulators

+. == t"e materials area) accetors!) donorsc) conductors

/. To function: i.e. conduct: a >unction diode made of silicon reuires a for'ard !ias of at leasta) 1A!) 1.41A

c) 8.#A

0. Diodes connected in arallel 'ould act li*e ana) an 93 gate!) an -$-D gatec) an $-D gate

2. With a transistor electrons leave thea) (ollector!) 6asec) Emitter

. $ common !ase amlifier hasa) Lo' iC and high oC imedance!) 5igh iC and high oC imedancec) Lo' iC and medium oC imedance

18. T3 is the a!!reviation for aa) torue s"nchro!) transmitter 3esolverc) torue receiver

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1. When a s"nchro s"stem is in corresondence: its transmitter and receivera) are in hase!) are anti7hasec) at 8 degrees to each other

#. "nchro s"stems deend on the rinciles ofa) mutual ,nductance!) electromagnetic inductionc) caacitive reaction

&. $ ie%oelectric cr"stal is an examle ofa) an analogue transducer!) a Electro $coustic Transducerc) a neumatic Transducer

4. The difference !et'een an oen and closed loo isa) corresondence

!) feed!ac*c) error signal

+. ,n a transistor: the arro' al'a"s oints in the direction ofa) conventional current!) electron flo'c) emitter

/. The emitter: !ase and collector currents follo' ohm=s and *irchoff=s la' 'hich isa) ,! ; ,e < ,c!) ,e ; ,c 7 ,!

c) ,e ; ,! < ,c

0. Which of the follo'ing exlains ho' the hotodiode 'or*s?a) hotodiodes are for'ard !iased to conduct 'hen light falls uon them!) hotodiodes are !ac* !iased to conduct 'hen light falls uon themc) hotodiodes are !ac* !iased not to conduct 'hen light falls uon them

2. The outut 'ill !e [ref to attached diagram]a)


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1. What t"e of o'er sul" is a Des"nn indicator s"stem connected to?a) $( +8 5%!) $( 488 5%c) D(

#. What does the Des"nn indicator rotor consist of?a) ermanent Magnet!) Electro magnetc) $luminium cored coil

&. ,n an -- transistor thea) collector is more ositive than the emitter!) emitter is more ositive than the collectorc) emitter is more ositive than the !ase

4. ,n an -- transistor thea) emitter is more ositive than the !ase

!) collector is more ositive than the !asec) collector is the same as the !ase

+.a)!)c)

/.a)!)

c)

0.a)!)c)

2.a)!)c)

.a)!)c)

18.a)!)c)

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EASA Module 4 (Club66) Questions

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