Final Exam Jan-Jun 09 for BACH unikl miat AES

8/10/2019 Final Exam Jan-Jun 09 for BACH unikl miat AES

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SECTION A (for BET Sem 5 & 6)

1 When necessary durin o!era"ion# CS$ disconnec" is usua%%yaccom!%ished y

A a s'i"ch in "he coc!i"B circuit breaker activation.C a shear section in the input shaft.

* A +o%"ae reu%a"or con"ro%s enera"or +o%"ae y chanin "he

A resistance in the generator output circuit.B current in the generator output circuit.C curren" of "he enera"or fie%d circui"

, Aircraf" 'hich o!era"e on%y ac enera"ors as a !rimary source of e%ec"rica%!o'er norma%%y !ro+ide curren" sui"a%e for a""ery charin "hrouh "heuse of

A a s"e!do'n "ransformer and a rec"ifierB an inverter and a voltage dropping resistor.C a dynamotor with a half wave dc output.

- One ad+an"ae of usin ac e%ec"rica% !o'er in aircraf" is

A that ac electrical motors can be reversed while dc motors cannot.B rea"er ease in s"e!!in "he +o%"ae u! or do'n.C that the effective voltage is 1.41 times the maximum instantaneous voltage;therefore less power input is re!uired.

5 A circui" reaer is ins"a%%ed in an aircraf" e%ec"rica% sys"em !rimari%y "o!ro"ec" "he

A circuit and should be located as close to the source as possible.

B circuit and should be located as close to the unit as possible.C e%ec"rica% uni" in "he circui" and shou%d e %oca"ed as c%ose "o "he source as !ossi%e


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6 When dc enera"ors are o!era"ed in !ara%%e% "o su!!%y !o'er for a sin%e%oad# "heir con"ro%s inc%ude an e.ua%i/er circui" "o assure "ha" a%% enera"orsshare "he %oad e.ua%%y The e.ua%i/er circui" o!era"es y

A increasing the output of the low generator to e!ual the output of the high

generator.B decreasing the output of the high generator to e!ual the output of the lowgenerator.

C increasin "he ou"!u" of "he %o' enera"or and decreasin "he ou"!u" of"he hih enera"or un"i% "hey are e.ua%

0 Wha" is "he co%or and orien"a"ion of "he !osi"ion %ih"s for na+ia"ion onci+i% air!%anes

A "eft side # green right side # red rear aft # white.

B 2ef" side 3 red# rih" side 3 reen# rear af" 3 'hi"eC "eft side # white right side # green rear aft # red.

4 Wha" does a rec"ifier do

A Changes direct current into alternating current.B Chanes a%"erna"in curren" in"o direc" curren"C $educes voltage.

E%ec"ric circui"s are !ro"ec"ed from o+erhea"in y means of

A thermocouplesB shunts.C fuses

1 The me"hod mos" of"en used in o+ercomin "he effec" of arma"ure reac"ionis "hrouh "he use of

A interpoles.B com!ensa"in 'indinC drum wound armatures in combination with a negatively connected series

field.


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11 Which of "he fo%%o'in is no" one of "he !ur!oses of in"er!o%es in aenera"or

A $educe field strength.B O+ercome arma"ure reac"ion.

C $educe arcing at the brushes.

1* The commu"a"or of a enera"or

A changes direct current produced in the armature into alternating current as itis taken from the carbon brush.

B chanes a%"erna"in curren" !roduced in "he arma"ure in"o direc" curren" as i" is "aen from "he caron rush.

C reverses the current in the field coils at the proper time in order to producedirect current.

1, Where is "he %andin ear safe"y s'i"ch usua%%y %oca"ed

A On "he main ear shoc s"ru"B %n the landing gear drag brace.C %n the pilot&s control pedestal.

1- Wha" %andin ear 'arnin de+ice(s) is7are incor!ora"ed on re"rac"a%e%andin ear aircraf"

A A visual indicator showing gear position.B A light which comes on when the gear is fully down and locked.C A horn or o"her aura% de+ice and a red 'arnin %ih"

15 8o' may "he s"a"e of chare of a %ead3acid a""ery e de"ermined

A Ammeter.B 'oltmeter.C 8ydrome"er

16 Wha" condi"ion charac"eri/es a "herma% runa'ay

A (ncreased resistance of the battery to input current.B )igh temperature and undercharging at a constant rate.C Con"inuous risin curren" and increasin a""ery "em!era"ure.


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10 Which is a !ur!ose of a "ransformer rec"ifier

A Con+er"s 115 +o%"s ac# -38/ "o *4 +o%"s dcB Changes dc to alternating *+ volts or 11, volts 4--#) power.C %perates emergency flight instruments and radios from the airplane battery.

14 The !ur!ose of a cons"an" s!eed dri+e for an ac enera"or is "o

A control field strength.B regulate generator voltage.C main"ain a uniform fre.uency.

1 Which is a fea"ure of a !ara%%e% us e%ec"rica% sys"em

A /xternal power may be paralleled with operating generators.B 0he electrical load is automatically redistributed when one generator fails.C Each enera"or su!!%ies !o'er se!ara"e%y from "he o"her enera"ors "o

i"s res!ec"i+e us.

* Wha" increases or decreases "he +o%"ae of a enera"or so i" carries i"sshare of "he %oad

A Current limiter.B 9ara%%e%in circui"

C $everse current cut#out relay.

*1 Wha" 'i%% neu"ra%i/e "he e%ec"ro%y"e from a %ead3acid a""ery

A oap and water.B Bicarona"e of sodaC Boric acid a solution of acetic acid lemon 2uice or vinegar.

** 8o' many am!eres 'i%% a *43+o%" enera"or are re.uired "o su!!%y "o acircui" con"ainin fi+e %am!s in !ara%%e%# "hree of 'hich ha+e a resis"ance of14 ohms each and "'o of 'hich ha+e a resis"ance of *- ohms each

A 0 am!eresB 11* amperesC -.*3 ampere.


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*, Which of "he fo%%o'in is a fa%se s"a"emen" aou" s.ui

A hen not connected to the aircraft the electrical pins should be shortedtogether

B :se "he norma% ohmme"er 'hen checin "he con"inui"y of "he s.ui.

C !uib is a life item

*- Wha" is7are "he ad+an"aes of con"inuous %oo! fire de"ec"ion sys"em

A "arge areas can be monitored with a single detector loopB (t can detect both overheat and fire conditions.C Bo"h A and B

*5 In 'ha" area of an aircraf" 'ou%d you %ie%y "o find a caron mono;ide

de"ec"or

A /ngine and 5 or nacelleB urface combustion heater compartmentC Coc!i" and 7 or cain

*6 One of "he !ur!ose of "he 'in %eadin ede i%%umina"ion %ih" is "o

A ins!ec" for any ice forma"ion on "he 'inB provide ground position of the aircraft from the other aircraft

C signal the ground tower for landing

*0 Which fire de"ec"ion sys"em measures "em!era"ure rise com!ared "o areference "em!era"ure

A 0hermal switch.B 6enwall continuous loopC Thermocou!%e

*4 Wha" are "he indica"ions of s"a%% 'arnin

A A siren soundB Blinking light in the cockpit and bell soundC A horn sound# 'arnin %ih" and


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* In con"ro% o;# any "ime a 'hee% dece%era"es a" a ra"e hiher "han "he"hresho%d +a%ue# a sina% is sen" "o "he

A control valve to maintain the brake pressureB control valve to increase the brake pressure

C con"ro% +a%+e "o reduce "he rae !ressure

, Wha" "y!e of mo"or does %andin ear re"rac"ion sys"em use

A tarter motorB S!%i" fie%d dc mo"orC ingle phase ac motor

,1 Wha" is "he !ur!ose of safe"y s'i"ch in "he %andin ear con"ro%

A 9re+en" acciden"a% re"rac"ion of "he ear durin aircraf" on roundB 7revent accidental retraction of the gear during aircraft on flightC Allow retraction of the gear during flight

,* Which of "he fo%%o'in com!onen"s is no" !ar" of "he an"isid sys"emA 0he wheel speed sensorsB 0he control valvesC :! and %oc s'i"ch

,, In an aircraf" 'i"h !ara%%e% $C enera"ors sys"em# 'ha" is "he !ur!ose of "hee.ua%i/in coi%s

A 0o make sure that all generators outputs are the same voltageB To mae sure "ha" a%% %oad are dis"riu"ed e.ua%%y amon "he enera"orsC 0hey serve no purpose.

,- =iure e%o' sho's circui" diaram 'i"h 0 "herma% s'i"ches When "es"re%ay enerised# 'hich of "he fo%%o'in s"a"emen" is T>:E


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A 0o test the serviceability of the thermal switches.B $ed light will illuminate and test the serviceability of the thermal switches.C >ed %ih" 'i%% i%%umina"e "o indica"e "ha" "he fire %oo! is ood

,5 2e+e% B a%er" messae re.uireA immediate correction action by the crewB immedia"e cre' a'arenessC no attention

,6 Which of "he fo%%o'in s"a"emen" is NOT T>:EA 0he caution and master caution lights on most aircraft can usually be dimmedB 0he rheostat is connected in series to the 8reen lights in order to control the

brightness of the light.C The in"ensi"y of "he >ed %ih" can e con"ro%%ed y usin rheos"a" 'hich

Is connec"ed in series 'i"h "he %ih"s

,0 Which "y!e of %ih" usua%%y %oca"ed a" "he hihes" fi;ed !ar" and one on "he%o'es" fi;ed !ar" of an aircraf"

A ing inspection light.B An"i3co%%ision %ih"C 9avigation light

,4 Wha" "y!e of %am! "ha" use a !rinci!a% of charin and discharin ofca!aci"or for !roducin a f%ashin %ih"

A (ncandecent lampB )alogen lampC ?enon "ue %am!


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, Which emerency %ih"in used "o assis" !assener "o e" ou" from aircraf""ha" is fu%% of smoe

A =%oor !ro;imi"y %ih"inB lide and door illumination lighting

C 6loodlighting

- Which of "he fo%%o'in is NOT T>:E aou" a Cau"ion %ih"

A The %ih" canno" e dimmedB :sed to indicate to the pilot and flight crew that an abnormal but not

necessarily dangerous condition existsC 9ormally amber in color

-1 $urin s"ar"in u! !rocess of an A9:# 'hen is "he !o'er "o "he s"ar"er isdisconnec"ed

A A" 5@ >9B hen oil pressure reaches ,, psiaC hen oil pressure reaches 1- psia

-* Which of "he fo%%o'in s"a"emen" is NOT T>:E aou" an A9: sys"em

A upply three phase 4-- ) AC power to the airplane.B A9: does no" need fue% for i"s o!era"ionC Battery charger must be disconnected during A7: starter engagement.


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-, $iaram e%o' sho's a sim!%e re%ay con"ro%%ed of au;i%iary !o'er sys"emWha" is "he !ur!ose or "he diode $1

A 0o increase the current to the external power relayB 0o protect the system from radio interferenceC To !ro"ec" "he sys"em aains" "he incorrec" !o%ari"y ein connec"ed "o"he

aircraf" e%ec"rica% sys"em

-- Cons"an" s!eed of >am Air $ri+e Turine is main"ained y

A o+ernor con"ro% "he !i"ch of "he !ro!e%%er %adeB pressure in the pump of $A0C sie of the propeller

-5 Which of "he fo%%o'in aircraf" 'arnin sys"em indica"es "ha" a sys"em iso!era"in as se%ec"ed

A Caution lightsB Advisory lightsC Warnin %ih"s

-6 Warnin %ih" can e ac"i+a"ed y ei"her !ara%%e% or series circui" Which of"he fo%%o'in i%%us"ra"e an ac"i+a"ion y a !ara%%e% circui"

A Any one of mu%"i!%e i"ems may ac"i+a"e "he annuncia"or7'arnin %ih"B All conditions must be met to activate the light.C 9one of the above


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-0 In Wa%"er idde sensors# a "'o 'ire conduc"ors emedded in a "hermis"orma"eria% Which of "he fo%%o'in is NOT T>:E aou" "hermis"or ma"eria%

A At high temperature the resistance of the thermistor material will fall rapidly.

B 0he thermistor material has a high electrical resistance when the temperatureis lowC The "hermis"or ma"eria% 'i%% ecome an insu%a"or a" hih "em!era"ure.

-4 Which of "he as in Sys"ron3$onner sensor 'i%% e;!and and !ro+ide!ressure "o "he res!onder and c%osed "he res!onder a%arm s'i"ch

A 9itrogen gasB )ydrogen gasC 8e%ium as

- When 'i%% "he In"eri"y S'i"ch con"ac" of "he Sys"ron3$onner res!ondero!en

A hen helium gas in the sensor tube depleted.B hen the sensor tube overheatedC When "he sensor "ue "em!era"ure dro! "o amien"7norma% "em!era"ure.

5 Wha" is a func"ion of "he se!ara"or ce%%o!hane in a nice%3cadmiuma""ery

A (nhibits thermal runaway.B Se!ara"es nea"i+e and !osi"i+e ce%%sC 7revents electrolyte leakage and contamination.


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SECTION B

0here are three


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* a= $iaram e%o' sho's a differen"ia% !ro"ec"ion circui" in "he C:

S"a"e "he o!era"ion of "his circui" 'hen i" is norma% o!era"ion (nofau%") and fau%" condi"ion

< marks=

b= $escrie "'o func"ion of "he enera"or Con"ro% :ni" (C:)

< marks=


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c= In AC dis"riu"ion# ho' does "he circui" e%o' main"ain "heenera"or ou"!u" if %ine +o%"ae increase ao+e 115 or decreasee%o' 115

4 marks=

2ine o%"ae


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, a= The diaram e%o' sho's a s!%i" us sys"em 'i"h an E;"erna%9o'er connec"ed "o i" Wha" 'ou%d e a confiura"ion (c%ose oro!en) of enera"or reaer 1 (B1)# B*# us "ie reaer 1 (BTB1)#BTB*# "ransfer re%ay 1 and * 'hen enine3dri+en enera"or no 1fai% in f%ih" and A9: is "urned on

< marks=

b= In a !ara%%e% ac enera"or sys"ems# name "he "'o com!onen"s of%oad "ha" mus" e shared e.ua%%y y a%% enera"ors

i=

ii=

< marks=

c= Brief%y e;!%ain ho' "he "'o %oad sharin are carried ou"

4 marks=

Transfer>e%ay 1

Transfer >e%ay *

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Final Exam Jan-Jun 09 for BACH unikl miat AES