CBSE Class 12 Electrical Appliances Question Paper 2020

H$moS> Z§.
Code No. 312
amob Z§. narjmWu H$moS >H$mo CÎma-nwpñVH$m Ho$ _wI-n¥ð
Roll No. >na Adí` {bIo§ &
Candidates must write the Code on the
title page of the answer-book.

ZmoQ> NOTE
(I) H¥$n`m Om±M H$a b| {H$ Bg àíZ-nÌ _o§ _w{ÐV (I) Please check that this question
n¥ð> 11 h¢ & paper contains 11 printed pages.

(II) àíZ-nÌ _| Xm{hZo hmW H$s Amoa {XE JE H$moS (II) Code number given on the right
>Zå~a H$mo N>mÌ CÎma-nwpñVH$m Ho$ _wI-n¥ð> na hand side of the question paper
{bI| & should be written on the title page of
the answer-book by the candidate.
(III) H¥$n`m Om±M H$a b| {H$ Bg àíZ-nÌ _| (III) Please check that this question
>28 àíZ h¢ & paper contains 28 questions.
(IV) H¥$n`m àíZ H$m CÎma {bIZm ewê$ H$aZo go (IV) Please write down the Serial
nhbo, CÎma-nwpñVH$m _| àíZ H$m H«$_m§H$ Number of the question in the
Adí` {bI| & answer-book before attempting it.
(V) Bg àíZ-nÌ H$mo n‹T>Zo Ho$ {bE 15 {_ZQ >H$m (V) 15 minute time has been allotted to
g_` {X`m J`m h¡ & àíZ-nÌ H$m {dVaU read this question paper. The
nydm©• _| 10.15 ~Oo {H$`m OmEJm & question paper will be distributed
10.15 ~Oo go 10.30 ~Oo VH$ N>mÌ Ho$db at 10.15 a.m. From 10.15 a.m. to
10.30 a.m., the students will read the
àíZ-nÌ H$mo n‹T>|Jo Am¡a Bg Ad{Y Ho$ Xm¡amZ question paper only and will not
do CÎma-nwpñVH$m na H$moB© CÎma Zht {bI|Jo & write any answer on the
answer-book during this period.

d¡ÚwV-`w{ŠV`m± (g¡ÕmpÝVH$)
ELECTRICAL APPLIANCES (Theory)

{ZYm©[aV g_` : 2 KÊQ>o A{YH$V_ A§H$ : 40
Time allowed : 2 hours Maximum Marks : 40

.312 1 P.T.O.

IÊS> H$
^mJ I
{H$Ýht Xg àíZm| Ho$ CÎma Xr{OE : 110=10

1. {dÚwV² AmBaZ _| Xmof hmo gH$Vm h¡ 1

(A) Ho$db ^y-g§nH©$Z Xmof
(B) Ho$db bKwnWZ Xmof
(C) Ho$db Iwbm n[anW Xmof
(D) Cn`w©º$ g^r Xmof

2. {ZåZ{b{IV _| go H$m¡Z-gm Am_Vm¡a na hm°Q> ßboQ> _| à`moJ hmoVm h¡ ? 1

(A) amoQ>ar pñdM
(B) Q>mB_a
(C) W_m}ñQ>oQ>
(D) Cn`w©º$ _| go H$moB© Zht $

3. {Ì^wOmH$ma _mBH$m ßboQ> Ho$ D$na Hw§$S>{bV H$s hþB© {ZH«$mo_ pñQ´>n Q>mBn VmnZ E{b_|Q> à`moJ
hmoVm h¡ 1

(A) Am°Q>mo_¡{Q>H$ {dÚwV² Ho$Q>b _|
(B) gmYmaU {dÚwV² Ho$Q>b _|
(C) (A) Ed§ (B) XmoZm| _|

(D) Cn`w©º$ _| go H$moB© Zht

4. E½µOm°ñQ>> µ\¡$Z H$m à`moJ {H$`m OmVm h¡ 1

(A) dm°eê$_ _|
(B) S>oµOQ>© Hy$ba _|
(C) ê$_ Hy$ba _|
(D) (A) Ed§ (B) XmoZm| _|

.312 2

SECTION A
PART I
Answer any ten questions : 110=10

1. Fault in electric iron may be 1

(A) Earth fault only

(B) Short circuit fault only

(C) Open circuit fault only

(D) All of the above faults

2. Which of the following is generally used in a hot plate ? 1

(A) Rotary switch

(B) Timer

(C) Thermostat

(D) None of the above

3. Nichrome strip wound over a triangular mica plate type heating element
is used in 1

(A) Automatic electric kettle

(B) Ordinary electric kettle

(C) Both (A) and (B)

(D) None of the above

4. Exhaust fan is used in 1

(A) A washroom

(B) A desert cooler

(C) A room cooler

(D) Both (A) and (B)

.312 3 P.T.O.

5. àmogog (àH«$_) O¡go gmoH$, dm°e, [aÝg Ed§ pñnZ {H$E Om gH$Vo h¢ 1

(A) gmYmaU YwbmB© _erZ go
(B) go_r-Am°Q>mo_¡{Q>H$ YwbmB© _erZ go
(C) nyU© Am°Q>mo_¡{Q>H$ YwbmB© _erZ go
(D) Cn`w©º$ _| go H$moB© Zht

6. W_m}ñQ>oQ> H$ÝQ´>mob H$m à`moJ hmoVm h¡ 1

(A) gmYmaU YwbmB© _erZ _|
(B) Am°Q>mo_¡{Q>H$ YwbmB© _erZ _|
(C) (A) Ed§ (B) XmoZm| _|

(D) Cn`w©º$ _| go H$moB© Zht

7. Kaoby {dÚwV² YwbmB© _erZ _| Am_Vm¡a na à`moJ hmoZo dmbr _moQ>a h¡ 1

(A) g§Ym[aÌ ñQ>mQ>© g§Ym[aÌ aZ _moQ>a
(B) [aboŠQ>Ýg _moQ>a
(C) pñßbQ>-\o$µO _moQ>a
(D) Cn`w©º$ _| go H$moB© Zht

8. H$b©a _| Xmof hmo gH$Vm h¡ 1

(A) _moQ>a _| Xmof Ho$ H$maU
(B) VmnZ E{b_|Q _| Xmof Ho$ H$maU
(C) H$m°S>© _| Xmof Ho$ H$maU
(D) (B) Ed§ (C) XmoZm|

.312 4

5. Processes like Soak, Wash, Rinse and Spin can be performed by 1
(A) Ordinary washing machine

(B) Semi-automatic washing machine

(C) Fully automatic washing machine

(D) None of the above

6. Thermostat control is used in 1

(A) Ordinary washing machine

(B) Automatic washing machine

(C) Both (A) and (B)

(D) None of the above

7. The motor generally used in domestic electric washing machine is 1

(A) Capacitor start capacitor run motor

(B) Reluctance motor

(C) Split-Phase motor

(D) None of the above

8. Defect in curler may be due to 1

(A) Defect in motor

(B) Defect in heating element

(C) Defect in cord

(D) Both (B) and (C)

.312 5 P.T.O.

9. EH$-H$br` àoaU _moQ>a H$s ñQ>{Q>ªJ Hw§$S>br hmoVr h¡ 1

(A) amoQ>a _|
(B) ñQ>oQ>a _|
(C) µ\$sëS> _|
(D) Cn`w©º$ _| go H$moB© Zht

10. _moQ>a _| Xmof hmo gH$Vm h¡ 1

(A) H§w$S>br _| Iwbo n[anW Ho$ H$maU
(B) dm°Z© {~`[a¨J Ho$ H$maU
(C) E`a J¡n na bm°qH$J Ho$ H$maU
(D) Cn`w©º$ g^r Ho$ H$maU

11. `y{Zdg©b _moQ>a H$m Am_Vm¡a na à`moJ hmoVm h¡ 1

(A) H$n‹S>o YmoZo dmbr _erZ _|
(B) E½µOm°ñQ> µ\¡$Z _|
(C) (A) Ed§ (B) XmoZm| _|

(D) Cn`w©º$ _| go H$moB© Zht

12. O~ hmWm| Ûmam {dÚwV² CnH$aUm| H$mo CR>m`m OmE, Vmo ì`{º$ H$s 1

(A) µ\w$qQ>J \$_© hmoZr Mm{hE
(B) nrR> grYr hmoZr Mm{hE
(C) {MZ AÝXa hmoZr Mm{hE
(D) Cn`w©º$ g^r
.312 6

9. The starting winding of a single-phase induction motor is placed in a 1

(A) Rotor

(B) Stator

(C) Field

(D) None of the above

10. Defect in motor may be due to 1

(A) Open circuit in the winding

(B) Worn bearing

(C) Locking at air gap

(D) All of the above

11. Universal motor is generally used in 1

(A) Clothes washing machine

(B) Exhaust fan

(C) Both (A) and (B)

(D) None of the above

12. When electric equipments are lifted manually, the person should have 1

(A) Firm footing

(B) Straight back

(C) Chin inward

(D) All of the above

.312 7 P.T.O.

^mJ II
{H$Ýht nm±M àíZm| Ho$ CÎma Xr{OE & 25=10

13. Amo.Q>r.Or. Ho$ H$m`m] H$m g§jon _| dU©Z H$s{OE & 2

14. JrµOa H$s g§aMZm H$m g§jon _| dU©Z H$s{OE & 2

15. XmofnyU© hrQ> H$ÝdoŠQ>a H$s _aå_V H$s {H«$`m{d{Y H$m dU©Z H$s{OE & 2

16. EH$ XmofnyU© ãb|S>a H$s Om±M Ed§ _aå_V H$aZo H$s {H«$`m{d{Y H$m dU©Z H$s{OE & 2

17. S>oµOQ© Hy$ba Ho$ à{VîR>mnZ H$s {H«$`m{d{Y H$m dU©Z H$s{OE & 2

18. d¡Š`y_ ŠbrZa _| hmoZo dmbo gm_mÝ` Xmofm| Ed§ CZHo$ H$maUm| H$m dU©Z H$s{OE & 2

19. ^mar {dÚwV² _erZm| H$mo h¢{S>b H$aZo Ho$ {bE Omo CnH$aU Mm{hE CZH$m g§{jßV {ddaU
Xr{OE & 2
^mJ III
{H$Ýht nm±M àíZm| Ho$ CÎma Xr{OE & 35=15

20. ~m°Cb Q>mBn ê$_ hrQ>a _| Š`m-Š`m Xmof hmo gH$Vo h¢, Ed§ CÝh| H¡$go Xÿa {H$`m Om gH$Vm h¡ ? 3

21. XmofnyU© hm°Q> ßboQ> H$s Om±M Ed§ _aå_V H$aZo H$s {H«$`m{d{Y H$m dU©Z H$s{OE & 3

22. gmYmaU {dÚwV² Q>moñQ>a Ho$ gm_mÝ` Xmofm| Ed§ CZHo$ H$maUm| H$m dU©Z H$s{OE & 3

23. gmYmaU {dÚwV² YwbmB© _erZ H$s g§aMZm Ed§ H$m`©àUmbr H$s ì`m»`m H$s{OE & 3

24. _¡Ý`wAb dmoëQ>oO ñQ>o{~bmBµOa H$m n[anW AmaoI ~ZmBE Ed§ BgH$s H$m`©àUmbr H$m g§jon _|
dU©Z H$s{OE & 3

25. N>moQ>r {dÚwV² {S´>b _erZ _| {H$g àH$ma H$s _moQ>a à`moJ hmoVr h¡ ? BgHo$ {deof bjUm| H$m
dU©Z H$s{OE & 3

26. {dÚwV² PQ>Ho$ go ~MZo Ho$ {bE Š`m-Š`m gmdYm{Z`m± ~aVZr Mm{hE± ? ì`m»`m H$s{OE & 3

.312 8

PART II

Answer any five questions. 25=10

13. Describe in brief the functions of an O.T.G. 2

14. Describe in brief the construction of a geyser. 2

15. Describe the procedure involved in the repair of a defective heat
convector. 2

16. Describe the testing and repairing procedure of a defective blender. 2

17. Describe the installation procedure of a desert cooler. 2

18. Describe the common faults and their causes in a vacuum cleaner. 2

19. Give a brief description of the equipment required to handle heavy
electrical machines. 2

PART III

Answer any five questions. 35=15

20. What defects can be found in a bowl type room heater, and how can they
be removed ? 3

21. Describe the procedure of testing and repairing of a defective hot plate. 3

22. Describe the common defects and their causes in an ordinary electric
toaster. 3

23. Explain the construction and working of an ordinary electric washing
machine. 3

24. Draw the circuit diagram of a manual voltage stabiliser and briefly
describe its working. 3

25. Which type of motor is used in a small electric drill machine ? Describe
its special features. 3

26. What precautions are to be taken to avoid an electric shock ? Explain. 3

.312 9 P.T.O.

IÊS> I
{H$gr EH$ àíZ H$m CÎma Xr{OE & 51=5

27. ãbmoAa Q>mBn H$j VmnH$ _| hmoZo dmbo Xmofm| H$s ì`m»`m H$s{OE, Am¡a ~VmBE CÝh| H¡$go Xÿa
{H$`m Om gH$Vm h¡ & 5

28. noS>oñQ>b µ\¡$Z H$s g§aMZm Ed§ Bg_| à`moJ hmoZo dmbr _moQ>a H$m {dñVmanyd©H$ dU©Z H$s{OE
VWm BgHo$ Cn`moJ ^r Xr{OE & 5

.312 10

SECTION B
Answer any one question. 51=5

27. Explain the defects in a blower type room heater, and how they can be
removed. 5

28. Describe in detail the construction of a pedestal fan and the motor used
in it, and also give its uses. 5

.312 11 P.T.O.