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DAE 21402 : PENGALATAN & PENGUKURAN ELEKTRIK

TUTORIAL 3 :

(1) State the purp!e " the #heat!t$e %r'e

(2) State the "u$*t$ " a'+u!ta%,e pre*!$ re!!tr $ #heat!t$e %r'e

(3) Dra- a$' ,a%e, *.p,ete,/ the %a!* *r*ut " the #heat!t$e %r'e

(4) Na.e a,, the *.p$e$t! " the *r*ut $ 3

() r. the *r*ut $ 3 a$a,/e the *r*ut .athe.at*a,,/ t pr'u*e a$ e5uat$" u$6$-$ re!!ta$*e -he$ the %r'e ! %a,a$*e

(7) State three e8a.p,e! " app,*at$! " the -heat!t$e %r'e $ *..er*a,

*r*ut!

(9) Ge a rea!$ -h/ there ! $ *urre$t ",- thruh the Ga,a$.eter -he$ the%r'e ! %a,a$*e Pre /ur a$!-er .athe.at*a,,/

(;) I$ the #heat!t$e %r'e !h-$ $ ure ; the re!!te *.p$e$t! hae the",,-$ $.$a, a,ue!: R1< 100 = R2< 1 6 = R3< 0 = a$' R4< 00 =

The a,a$.eter ha! a$ $ter$a, re!!ta$*e " 9 = >a,*u,ate the 'e",e*t$ " the

a,a$.eter

ure ;

(?) A %a,a$*e' A> %r'e ha! the ",,-$ *$!ta$t!: ar.AB R < 2000 = $ para,,e,-th > < 0049 @ ar.BC R < 1000 = $ !ere! -th > < 049 @ ar. CD

u$6$-$ ar.DA > < 0 @ The "re5ue$*/ " the !*,,atr ! 1000 B $' the

*$!ta$t! " ar. CD

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(10) A %r'e ! %a,a$*e' at 1000 B a$' ha! the ",,-$ *$!ta$t!:AB 02 @ pure

*apa*ta$*eBC 00 = pure re!!ta$*e CD u$6$-$DA R < 300 = $ para,,e,

-th > < 01 @ $' the R a$' > r L *$!ta$t! " ar. CD *$!'ere' a! a !ere!*r*ut

(11) A 1000 B %r'e ha! the ",,-$ *$!ta$t!: ar. AC R < 1000 = $ para,,e, -th> < 0 @ ar.BC R < 1000 = $ !ere! -th > < 0 @ ar. CD L < 30 .B $

!ere! -th R < 200 = $' the *$!ta$t! " ar.DA t %a,a$*e the %r'e E8pre!!

the re!u,t a! a pure R $ !ere! -th a pure > r L a$' a,! a! a pure R $ para,,e,-th a pure > r L

(12) A a8-e,, %r'e 'e!$e' t .ea!ure the u$6$-$ .pe'a$*e (R8 L8) " a *,

! !h-$ $ ure 12(a) Dere a$ e8pre!!$ "r R8a$' L8u$'er %a,a$*e *$'t$!

(%) I" the "8e' %r'e *.p$e$t a,ue! are R2< 100 = a$' > < 20 @

*a,*u,ate the a,ue " the u$6$-$ .pe'a$*e " R1< 31;3 = a$'

R3< 0 = at %a,a$*e

(*) >a,*u,ate the "a*tr "r the *, " the !upp,/ "re5ue$*/ ! 0 B

ure 12