Download SGBAU (Sant Gadge Baba Amravati university) B-Tech/BE (Bachelor of Technology) 1st Sem Electrical Engineering Previous Question Paper
10089 : Electrical Engineering : 1 B 4 / 2 S(?T
P. l?ugL?s : 3 A ?W ? Z9ZXA(I(I
l|[Illnyl|lgllllj||||5||||Ill! \1 MW ; M,
Time : Thrcc Hours
Nola : 1. All question carry equal marks.
2. Answer 'l?hree question from Section A and Three quC?NItt v IE-t ~ 83? ?tOD W.
3. Due credit will be given to neamess and adequate dimcmit?
4. Assume suitable data whcrcvcr necessary.
5. Illustrate your answer necessary with the help ofnent skctmx.
6. L'sc ofpen Blue/Black inle'rcl'xll only for writing Ihc unm gt 1me
SECTION ? A
l. :1) Calculate the Resistance R. 7
A l
A , i
MIA 1 i
. g x, :5 ,
R 109 209 30:2 10:2 _ ms; 129::
> h . . '9 "l:-
l I
1 :
40V '2? ' ?
B i
! n
|
1
I
h) , V . r) (X1 7
Dchnc Temperature coef?ment. Prove that (13 : ?,? .
1+a1(t3 ?ll]
0R
2. L1) l-or the circuit shown in ?g. Find lg such that the current in 120:2 Rsxxxt 'tct '< 7931. 7
MAN
3012
__ 7 I
12v T g 1-09 1?) \
ht State and explain maximum power lrunst'cr theorem. Where this them cm ?,?tx't?; Jlaz'E} mcd?.? 7
3. :1) Explain Similarities and dissimilarilics 01? liluctric and Magnetic circuit 6
AW - 2928Add I P.T.( t
b)
21)
h)
b)
a)
b)
A \V - 2928Add
Two Identical coils A and B ul~ 1000 Iums each lie in parallel plan: T?Uk h 731.,? NH? 01 Ilix
pioduwd by one coil link With IhC olhct. A current of 5A ?owing ? l m3} pnduuw a
?ux of 0.05 me in it. 11?th current in coil A changes from + 1 0A [0 |(I.-\ in Mil : :comzs.
Calcul [16
i) mutual inductance. ii) cml'induce in coil H,
OR
Explain statically induce Emt?.
An lI'Ull ring ofmean Circumthrcnce 80 cm is made from round iron 01 we: \?11; . 11 lm:
sziw Cll' 0f2mni wide and is will With 500 tums. Find the current l'L?qUiI'ci ll.? Nil : e a i"?l\
MOS me across the :iirgap? Assume a relatixc pcrmcability for ii'nn ; - 0:5 v.21; fukuge
factor M 1.25.
Derive rm cxprcssion lbr current whm pure capacitor is cnnnccm! ilL?l :5: iii ;f:::m::7wg
voltage. Show its waveform and phasor diagram
Hnd 1h: average value and RN15 value of'wavciorm.
OR
De?ne and explain l?c?illowiigy lcrms as applied to AC. circuit.
i'l Power factor.
ii) Fn-qucncy.
iii) Impedanca
A series circuit has a following mmponunt och51stancc ISQ inductance 3.!)53 f .k gszpugriuz-
100p F. Across u 230\?. 5(IH7 supply ?nd
i) Relctancc, ii) Impedance.
iii) Power factor. iv) Voltage across each CiCZ?illei
SI"! ?TION - B
Prove that algebraic sum ol?lhrec phase wllagc is zero also draw thcii' \su'i :i?bt' 1'} m1: phiwi?
diagram
Three choke coil having reminnce of 20S) and inductance of 0.21] are :02? :cisi in =i;lf?
acres; 400V. 3(1). SOHZ supply. Culculat:
1') line current
iii Active power and Rcacm c power.
OR
I)
?4
(v
?4
*4
b)
b)
10. a)
13)
II. a)
b)
12. a)
b)
AW - 2928Add
Derive the rclminnship among phase and lme voltage, phase and line current for balance
Dclla connectcd lnzld.
A balance star muncctcd loud is supplied from a symmetrical 3d). 415V system the currcm
in each phu>c is Zl')/'?3(l?. dclcnnmc
i) phasc \ 011(1)::
ii) line current
iii) total power
iv) power facmr of load.
If one 01?th branch impedance ofstar connected load becomes open circuited calcululc
i) line current ii) power taken from the line.
Explain construction and working principle of a single phase transfonncr. Why it can not
work on D.(? supply :ystcm?.?
Derive the torque cquation OfIhe DC. motor.
0R
Explain various {0:505 in a transformer.
What do you mum by DC. motor? Explain brie?y the different types of DC. motor with
suitable diagram.
Explain construction and working ofpermanent magnet moving coil type instrument.
A measuring instrument ol?a resistance 5!) required potential difference 01' 75mV to give a
full scale de?ection calculate
i) Value 0131mm resistance needed to enable the instrument to give full scale de?ection
at 30 Amp.
ii) Value 01? scries resistance to allow inslrumcnt to work as a voltmeter with full scale
reading of? 250 Volt.
OR
Explain the need ol?carthjng an clecln'cal equipment and explain how carlhing is done.
State safety prccuutions in Ilandling Electrical Applianccs.
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U4
This post was last modified on 10 February 2020