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2nd NATIONAL CERTIFICATION EXAMINATION 2005FOR

ENERGY MANAGERS AND ENERGY AUDITORS

MODEL TEST SERIES -A

PAPER – 3: ENERGY EFFICIENCY IN ELECTRICAL UTILITIES

Duration: 3 HRSMax. Mar!: "50

General instructions:

o Please check that this question paper contains 65 questions

o The question paper is divided into three sections

o All questions in all three sections are compulsory

o All parts of a question should be answered at one place

S#$tion % I: O&'ECTI(E T)*EMar!: 50 x " + 50(i) Answer all 50 questions(ii) Each question carries on# mark

Objective Type1. What is the overall ei!ie"!# o ther$al %o&er %la"t i" I"'ia(

a) **+*,- ) */+30- !) 30+2- ') 2+0-

*. What is the a!!ra!# level 4!lass ) o ele!tro"i! $eters %rovi'e' # Ele!tri!altilit#(

a) 2.1 ) 2.* !) 2.3 ') 2.

3. Rati"5 o Ca%a!itors or $otor shol' e

a) E6al to No loa' $a5"eti7i"5 89AR

) Less tha" No loa' $a5"eti7i"5 89ARa) ore tha" No loa' $a5"eti7i"5 89AR

') No"e o the aove.

. A *22 89AR !a%a!itors rate' at *329 is !o""e!te' i" the s+statio". What is the -

re'!tio" o 89AR !a%a!itor i a!tal o%erati"5 volta5e is *129.

a) 1;.; ) *2.; !) *0.; ') 32.;

0. <ri"5 i"'!tio" $otor o%eratio"= a5"eti! iel' is estalishe' i"

a) Stator &i"'i"5 o"l# ) Rotor &i"'i"5 o"l#

!) Stator a"' Rotor Wi"'i"5s ') No"e o the aove

Paper 3/ Series A of 8



;. Three %hase I"'!tio" $otor has ollo&i"5 "$er o &i"'i"5s i" the stator

a) >"e &i"'i"5 ) Three &i"'i"5s !) For &i"'i"5s') Si? &i"'i"5s

,. What is the s%ee' o +%ole I"'!tio" $otor i re6e"!# is ;2 !#!les

a) 1022 ) 1/22 !) 3;22 ') 1222

/. Whi!h are the t&o i$%orta"t attrites or Ele!tri!al Ei!ie"!# o AC I"'!tio"

$otors.

a) 9olta5e a"' Crre"t ) @ert7 a"' T@<

!) Ei!ie"!# a"' Resista"!e ') Ei!ie"!# a"' Po&er Fa!tor

. Stra# losses is 5e"erall# %ro%ortio"al to

a) S6are o the Rotor !rre"t ) S6are o the Stator Crre"t

!) S6are o the Rotor a"' Stator Crre"t ') No"e o the aove

12. What is the - o ll loa' sli% o $otor i shat s%ee' o %ole $otor is 102(

a) *.33 ) 3.33 !) .33 ') 0.33

11. What is the t#%i!al - o loss a!!o"te' 'e to !ore loss i" the overall $otor losses(

a) 12+10- ) *2+*0- !) 30 + 2- ') 0+02-

1*. The !hara!teristi! o a %ositive 'is%la!e$e"t !o$%ressor or a 5ive" s%ee' isa) Te$%eratre re$ai"s !o"sta"t

) Flo& ot%t re$ai"s !o"sta"t

!) Pressre re$ai"s !o"sta"t') Co$%ressio" ratio re$ai"s !o"sta"t

13. Whi!h o the ollo&i"5 is "ot sitale to otai" a %ressre o 3 ar(a) Si"5le sta5e re!i%ro!ati"5

) ltista5e re!i%ro!ati"5

!) Loe !o$%ressor ') Ce"tri5al !o$%ressor

1. The lo& ot%t o &hi!h o the ollo&i"5 !ha"5es &ith %ressrea) Ce"tri5al !o$%ressor

) S!re& !o$%ressor

!) Re!i%ro!ati"5 !o$%ressor ') Loe !o$%ressor

10. Whi!h o the ollo&i"5 is "ot tre o air re!eivers(a) S$oothe" %lsati"5 air ot%t

) Stora5e o lar5e vol$es o air




!) A sor!e or 'rai"i"5 $oistre

') I"!reases the %ressre o air

16. The loa'i"5 a"' "loa'i"5 o a re!i%ro!ati"5 !o$%ressor is !arrie' ot ase' o"

a) Pressre ) 9ol$e

!) Te$%eratre') oistre !o"te"t

1,. Pere!t !ooli"5 reers to

a) First a"' se!o"' sta5e i"let a" te$%eratre are sa$e

) Co$%lete %i!B % o heat # le oil!) I"let a"' otlet te$%eratres o air are sa$e

') Co$%resse' air roo$ te$%eratre sa$e as a$ie"t te$%eratre

1/. At &hi!h o the 'e& %oi"t te$%eratre= air &ill have least $oistre !o"te"t

a) –12oC

) –*2oC!) 32oC

') –2o

C1. For s 7ero a%%li!atio"s the se!o"'ar# !oola"t "or$all# se' is:

a) Chille' &ater

) Dri"e

!) Lithi$ Dro$i'e') A$$o"ia

20. The %ressre o reri5era"t i" va%or !o$%ressio" s#ste$ !ha"5es i"a) Co$%ressor

) E?%a"sio" valve

!) Eva%oratio"') Doth 4a) 4)

*1.Whi!h o the ollo&i"5 is se' as a" asore"t i" a va%or asor%tio" s#ste$(a) Water ) Lithi$

!) Dro$i"e

') Lithi$ Dro$i'e

22.

@er$eti! s#ste$ are se' i"

a) <o$esti! reri5erators ) Ce"tri5al !hillers

!) S!re& !hillers

') Lar5e re!i%ro!ati"5 !hillers

23.9ariale s%ee' 'rives or !a%a!it# !o"trol !a" e se' &itha) Ce"tri5al ) S!re&

!) Re!i%ro!ati"5

') All o the aove

*.

The C>P is a "!tio" o

a) Eva%oratio" te$%eratre ) Co"'e"ser te$%eratre




!) Doth 4a) 4)

') No"e o the aove

2.

Whi!h o the ollo&i"5 !a" e se' as reri5eratio" oth i" va%or !o$%ressor a"'

va%or asor%tio" s#ste$a) A$$o"ia

) R – 11!) R+1*') Lithi$ Dro$i'e

*;.

At &hi!h o the ollo&i"5 !o"'e"ser te$%eratres= the %o&er !o"s$%tio" &ill e

least:a) 31oC

) */ oC

!) *, oC') *3 oC

2!.

Whi!h o the ollo&i"5 a"s are sitale to ha"'le 'st la'e" a"' hi5h te$%eratre5ases

a) For&ar' !rve' ) Da!B&ar' !rve' !) Ra'ial ') Pro%eller

*/.

The a" !hara!teristi! !rve is a %lot o

a) Stati! %ressre vs lo& ) <#"a$i! %ressre vs lo& !) Total %ressre vs lo& ')

S!tio" %ressre vs lo&

*.

A a" is 'ra&i"5 1; BW at /22 RP. I the s%ee' is re'!e' to ;22 RP the" the

%o&er 'ra&" # the a" &ol' e

a) 3* BW ) *1.3 BW !) 1* BW ') ;.,0 BW

32.

The %ressre 'evelo%e' # a !e"tri5al a" 'e%e"'s o"

a) h+to+ti% ratio ) ti% a"5les !) la'e &i'th ') all o the aove

31.

Whi!h o the ollo&i"5 !a" !ha"5e the a" !hara!teristi! !rves

a) I"let 'a$%er ) >tlet 'a$%er !) I"let 5i'e va"e ') No"e o the aove

3*.

I" series o%eratio" o i'e"ti!al a"s

a) Flo& 'oles ) Stati! %ressre 'oles !) Stati! %ressre 5oes % # or ti$es ')Flo& 5oes % # or ti$es

33.

I" a !e"tri5al %$% the velo!it# e"er5# is !o"verte' to %ressre #

a) I$%eller ) Casi"5 !) Throttle valve ') <iser

3.

The e"er5# savi"5s &ith variale s%ee' 'rives &ill e $a?i$$ or &hi!h o the




ollo&i"5 s#ste$s

a) Pre stati! hea' ) Pre ri!tio" hea' !) @i5h stati! hea' a"' lo& ri!tio" hea' ')

Lo& stati! hea' &ith hi5h ri!tio" hea'

30.

T&o a5ri!ltral %$%s &ith o%e" 'is!har5e are o%erati"5 i" %arallel o"e &ith a'eliver# o *2 $3hr a"' the other &ith a 'eliver# o 32 $3hr. The !o$i"e' lo&

rate &ol' e

a) 02 $3hr ) 33 $3hr !) ;2 $3hr ') !a""ot e 'eter$i"e' ro$ the 5ive" 'ata

3;.

I" a s#ste$ the stati! hea' is 12 $ a"' the ri!tio" hea' is *0 $. The %$% has to

'eliver a %ressre o

a) 12 $ ) *0 $ !) 30 $ ') $ore tha" 30 $

3,.

@i5her the C>C i" !ooli"5 to&er = the lo& 'o&" 6a"tit# &ill

a) i"!reases ) 'e!reases !) No !ha"5e ') No"e o the aove

3/.

The t#%e o Fa" se' or or!e' 'rat !ooli"5 to&er is

a) Ce"tri5al a" ) A?ial a" !) Doth !e"tri5al a?ial a"

') Pro%eller a"

3.

Allo&e' 'rit loss i" the !ooli"5 to&er is

a) *.2- ) 2.*- !) 2.2*- ') 2.22*-

2.

L$i"aire is a 'evi!e &hi!h

a) Pro'!es li5ht ) <istrites li5ht !) ilter the li5ht

') <istrites= ilters or tra"sor$s the li5ht e$itte' ro$ la$%s

1.

The "it o o"e l? is

a) 1222 l$e" %er s6are eet ) 12 l$e" %er s6are $eter

!) >"e l$e" %er s6are $eter ') 1 l$e" %er s6are eet

*.Whi!h o the ollo&i"5 la$%s has %oor !olor re"'eri"5 i"'e?

a) CFL ) @P9 !) FTL ') I"!a"'es!e"t

3.

Whi!h o the ollo&i"5 la$% has the hi5hest ei!a!#(

a) $etal hali'e ) halo5e" la$%s !) @P9 ') @PS9




.

@o& $a"# revoltio"s taBe %la!e or ever# %o&er stroBe i" a si"5le !#li"'er

stroBes e"5i"e(a) 1 ) * !) 3 ')

0.

The !a%a!it# o lar5est $otor that !a" e starte' i" the 5ive" <G set isa) *0-

) 02- 89A rati"5 o <G set!) ,0-') 122-

;.

The $a?i$$ "ala"!e' loa' et&ee" %hase shol' "ot e?!ee' ++++++- o !a%a!it#

o <G sets.a) 12-

) 10-

!) *2-') *0-

,.

The i"%ts re6ire' or a" ato$ati! %o&er a!tor !o"troller si"5 B9AR !o"trol

a) Crre"t ) 9olta5e !) Ca%a!ita"!e ') Doth a a"'

/.

A sot starter re'!es

a) Starti"5 ti$e ) Starti"5 !rre"t !) Starti"5 %o&er ') Fll loa' %o&er

.

I" a variale tor6e loa' the tor6e is %ro%ortio"al to

a) Ce o s%ee' ) S6are o s%ee' !) S6are root o s%ee' ') S%ee'

02.

@ar$o"i!s are 5e"erate' #

a) variale re6e"!# 'rive ) Fli' !o%li"5 !) E''# !rre"t 'rive ') E"er5#

ei!ie"t $otors

S#$tion , II: SHORT DESCRI*TI(E -ESTIONSMar!: "0 x 5 + 50

(i) Answer all T#n questions(ii) Each question carries Fi/# marks

1 What are the varios volta5e level at &hi!h %o&er is tra"s$itte' a"' 'istrite' a"'

&h#( @o& hi5h volta5e tra"s$issio" hel%s or e"er5# ei!ie"!#(

* The Av5. PF o a" e"5i"eeri"5 i"'str# is 2./ &ith ele!tri!al loa' o 22 8W.<eter$i"e the 89AR re6ire' i PF is i$%rove' to 2. to avoi' PF %e"alt# a"' <

re'!tio".




3 What are the varios losses i" $otor a"' riel# e?%lai" its !ases(

What is "'er+loa'i"5 o $otor( What are the or !ases or "'er+loa'i"5 o

$otors( e"tio" the %ossile $easres to over!o$e the "'er+loa'i"5.

0 Fi"' ot a vol$etri! ei!ie"!# o a si"5le a!ti"5 !o$%ressor i ree air 'elivere' i"

1,; !$ a"' Dore 'ia 32 !$= stroBe le"5th 2 !$ a"' s%ee' i" *22 r%$.

; A %ro!ess li' at *3$3hr. is lo&i"5 i" a heat e?!ha"5er a"' is to e !oole' ro$32oC to *0oC. The li' s%e!ii! heat is 2.,/ BCalB5. Fi"' ot the !hille' &ater

lo& rate i the !hille' &ater ra"5e a!ross the eva%oratio" is 3oC.

, E?%lai" &ith a sBet!h ho& the s#ste$ !hara!teristi! !ha"5es &ith i"!rease i" s#ste$

resista"!e or a a" s#ste$.

/ A %$% is 'eliveri"5 / $3hr o &ater &ith a 'is!har5e %ressre o 3, $. The &ater

is 'ra&" ro$ a &ell &here &ater level is $ elo& the %$% !e"terli"e. The %o&er 'ra&" # the $otor is .3 BW. I the ei!ie"!# o the %$% is ;0 - !al!late the

$otor ei!ie"!#.

<ei"e LG ratio a"' e?%lai" the si5"ii!a"!e o this ratio.

12 <ei"e the ter$s L?= CRI= L$i"os ei!a!#.

S#$tion , III: LON DESCRI*TI(E -ESTIONSMar!: 5 x "0 + 50

(i) Answer all Fi/# questions(ii) Each question carries T#n marks

1 The !o"tra!te' 'e$a"' o a !he$i!al %la"t is 1222 89A. The avera5e $o"thl# <

re!or'e' is /22 89A o"l#. The avera5e $o"thl# e"er5# !o"s$%tio" is 1.; laBhs"it. The tilit# ill a"al#sis %rovi'es the ollo&i"5 illi"5 !o$%o"e"ts.

i"i$$ $o"thl# illi"5 'e$a"' is /2- o !o"tra!te' < or the a!tal re!or'e'< &hi!hever is hi5her.

i"i$$ %o&er a!tor $a# e $ai"tai"e' is .

2.0- o "it !har5e or ever# .21 %oi"t elo& the .2 PF &ill e !har5e' a''itio"all#

as %e"alt#.

2.0- o "it !har5e or ever# .21 %oi"t aove the .0 PF &ill e 5ive" as i"!e"tive or

$ai"tai"i"5 hi5her %o&er a!tor.




< !har5e is Rs.322 %er 89A

E"er5# !har5es is Rs. %er 8W@

E"er5# a"a5er o the %la"t has %ro%ose' to i$%rove the %o&er a!tor ro$ 2./; to2.; # a''i"5 !a%a!itors i" the 'istritio" s#ste$.

<eter$i"e the ollo&i"5:

1. < re'!tio" i" 89A

*. o"thl# Cost savi"5.

* E?%lai" the ee!t o the ollo&i"5 o" !o$%ressor %eror$a"!e

i. I"taBe air te$%eratre

ii. Clea" air i"taBeiii. <r# air i"taBe

iv. Elevatio"

v. Ei!ie"!# o i"ter!ooler a"' ater !ooler

3 <ei"e the ter$s velo!it# %ressre= stati! %ressre a"' total %ressre. E?%lai" ho&

velo!it# is $easre' # %itot te i" a '!t.

A !e"tri5al %$% %$%i"5 &ater o%erates at 30 $3hr a"' at 12 RP. The %$%o%erati"5 ei!ie"!# is ;/- a"' $otor ei!ie"!# is 2-. The 'is!har5e %ressre

5a5e sho&s . B5!$*. The s!tio" is *$ elo& the %$% !e"terli"e. I the s%ee' o

the %$% is re'!e' # 02 - esti$ate the "e& lo&= hea' a"' %o&er.

0 E?%lai" For i$%orta"t a!tors that ae!ts the !ooli"5 to&er %eror$a"!e.


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