krl questions of previous exams

8/17/2019 KRL Questions of Previous Exams

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KRL TEST Quiz

Q1- energy stored in an inductor? (1/2 LI

2

)Q2-bucco!z re!ay is used "or? !arge interna! "au!ts#

o$ercurrent %rotection# any o" te&'''''(u saturation)

Q*- breating in trans"or&er is used "or'''''''

Q+- ,att&eter is used to &easure ? acti$e # reacti$e#

rea!# tota! %o,er''''

Q.- i" sunt resistance is increased in %arra!!e! ,it

ga!$a!no&eter# ten

current sensiti$ity decreases# current sensiti$ity

increases# deection torue increases# resistance

increases'''''

Q0- ogging is used "or''''''

breaing# &otor running and ten sto%%ing# !oading

&otor in ste%s''''

Q3-e&" o" dc generator is

Eg4 +'++ "5 6# Eg4127"/8# Eg4 8659/07:

Q;- in bus $ar %rotection# diciency

Q17-"or& "actor is

r&s/a$g# %ea/r&s# a$g/r&s''''''''


2/4

Q11- out%ut o" auto-trans"or&er is

in%ut(1-52/51) # out%ut (1-52/51)# out%ut (1-51/52)

Q12- %o,er o" 2 %ase sine signa! is

@Icos 6/2# @Icos 6# srt (2)@Icos 6Q1*- s%eed o" induction &otor is

5s# 7'.5s# s5s# 5s(1-s)

Q1+-&egnatic Ae!d o" straigt !ine conductor is

5IB/(2%ir) # 5IB/ !(!engt)# tird o%tion i donCt no,

Q1.-i" core !oss 4077D# co%%er !oss 4=77D# ten at

,ic %ercent !oad # e>ciency ,i!! be &a

3.# 177# .7# 2.

Q10- "or &icro,a$e "reuency# ,ic core o" trans"or&er

is used

carbon# si!icon stee!# "errite# "erro&agnetic

Q13-i" "reuency increases# ysterisis !oss ,i!!

increase# decrease# uncanged

Q1;- o&Cs !a, is not a%%!icab!e on

ig current# !o, resistance# ig %o,er# se&i conductors

Q1=- at resonance# te ang!e is

+. degree# =7 degrees# 1;7 degrees# 7 degree

Q27- %" o" trans"or&er is

a!,ays !eading# !agging# 7';# de%ends on te nature o"

!oad

Q21- %" o" syncronous generator is de%endent on

!oad# angu!ar s%eed# ar&ature !oss# core !oss

Q22- e>ciency o" distribution trans"or&er is &ai&u& at

no !oad# .7 !oad# 3. !oad# "u!! !oad

Q2*- &agnetising co&%onent o" te trans"or&er is

a!,ays !agging# !eading# any o" tese

Q2+- tota! current in unba!anced %ase is


3/4

a!gebraic su& o" IaFIbFIc# $ector su& o" IaFIbFIc# zero'

Q2.- ca%acitor is a!,ays designed "or

%ea $o!tage# a$erage $o!tage# r&s $o!tage

Q20- s%ar is %roduced due toig resistance# ig inductance# ig %o,er# a!!

Q23- "or 0 %o!e sync generator# e!ectrica! degrees in one

re$o!ution is eua! to degrees

*07#327# 17;7# 2107

Q2;- &a e>ciency o" syn generator is ,en ,ic

conAguration is used

sa!ient %o!es# non-sa!ient %o!es# any o" tese

Q2=- i" 1777D eater is in series ,it 07 D !a&%# no,

177D !a&% is connected ,it eater# ,at ,i!! be te

e


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Q*+- ,ic ,i!! a$e te !east $a!ue o" resistance

227@1777D # 227@ .77D # 11. @ 1777D# 11.@ .77D

Q*.- i" resistance o" tungsten is 17 ti&es te co!d

resistanceG i" 277 @ is a%%!ied and 841777D tenresistance o" co!d resistance ,i!! be

Q*0- * %ase induction &otor as "4.7Hz# 227@# 277D

and s(S!i%) 4 *# ten rotor "reuency ,i!! be

1'. Hz# 2 Hz# +Hz# *Hz

Q*3-84277%#277@#.7Hz# *-%ase induction &otor# "u!!

!oad current ,i!! be

( i donCt no, te o%tions)

Q*;- in *-%ase de!ta conAguration# I4+7:# ,at ,i!! be

current in conAguration

+7:# 2;:# 21:# ..:

Q*;- core !oss can be taen out by test

sort cct test# o%en cct test# ( 2 oter tests i didnCt study

in engineering)

Q*=- i" !oad on te trans"or&er canges# ten

core !oss is uncanged# co%%er !oss canges# core !oss

canges

Q+7-ogging is used due to

Jreaing# ste% by ste% &otor s%eeding# ( 2 oter

o%tions)

(5ote cec a!! ans,er by yourse!"# so&e o" e& &ay not

be correct)

krl questions of previous exams

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