CBSE Class 12 Question Paper 2023 Electrical Technology

Qu e st i o n

P a p e r
2023

Series HEFG Set-4
àíZ-nÌ H$moS>
Q.P. Code 343
amob Z§.
Roll No.

{dÚwV àm¡Úmo{JH$s
ELECTRICAL TECHNOLOGY
:3 : 60
Time allowed : 3 hours Maximum Marks : 60

H¥$n`m Om±M H$a b| {H$ Bg àíZ-nÌ _o§ _w{ÐV n¥ð> 15 h¢ &
àíZ-nÌ _| Xm{hZo hmW H$s Amoa {XE JE àíZ-nÌ H$moS H$mo narjmWu CÎma-nwpñVH$m Ho$
_wI-n¥>ð> na {bI| &
H¥$n`m Om±M H$a b| {H$ Bg àíZ-nÌ _| >24 àíZ h¢ &
H¥$n`m àíZ H$m CÎma {bIZm ewê$ H$aZo go nhbo, CÎma-nwpñVH$m _| àíZ H$m H«$_m§H$
Adí` {bI| &
Bg àíZ-nÌ 15 {_ZQ >H$m g_` {X`m J`m h¡ & àíZ-nÌ H$m {dVaU
10.15 ~Oo {H$`m OmEJm & 10.15 ~Oo go 10.30 ~Oo VH$ N>mÌ Ho$db
àíZ- -nwpñVH$m na H$moB© CÎma Zht {bI|Jo &

Please check that this question paper contains 15 printed pages.
Q.P. Code given on the right hand side of the question paper should be
written on the title page of the answer-book by the candidate.
Please check that this question paper contains 24 questions.
Please write down the serial number of the question in the
answer-book before attempting it.
15 minute time has been allotted to read this question paper. The
question paper will be distributed at 10.15 a.m. From 10.15 a.m. to
10.30 a.m., the students will read the question paper only and will not
write any answer on the answer-book during this period.
*
343 Page 1 of 15 P.T.O.

:

(i)
(ii) 24 :

(iii)

(iv) (6 + 18) = 24 3
(6 + 11) = 17
(v)
(vi) : 30 :
(a) 6
(b)
(c)
(d) /
(vii) : 30 :
(a) 18
(b) 11
(c)
(d) /

IÊS> H$ $
(dñVw{ZîR> àíZ) (30 A§H$)

1. amoµOJma H$m¡eb na {XE JE 6 àíZm| _| go {H$Ýht 4 àíZm| Ho$ CÎma Xr{OE & 4 1=4
(i) àoO|Q>oeZ ¢?
(ii) Q>o³ñQ> qàQ> H$aZo H$s em°Q>©H$Q> Hw§$Or ³¶m h¡ ?
(iii) Z- {dH$ma H$m EH$ CnàH$ma h¡ ?
(a) n¡amZm°`S> ì¶{º$Ëd {dH$ma
(b) pñH$µOmoQ>mBnb ì¶{º$Ëd {dH$ma
(c) {hpñQ´>`mo{ZH$ ì¶{º$Ëd {dH$ma
(d) pñH$µOm°BS> ì¶{º$Ëd {dH$ma

343 Page 2 of 15

General Instructions :
(i) Please read the instructions carefully.
(ii) This question paper consists of 24 questions in two Sections : Section A
and Section B.
(iii) Section A has Objective type questions, whereas Section B contains
Subjective type questions.
(iv) Out of the given (6 + 18) = 24 questions, a candidate has to answer
(6 + 11) = 17 questions in the allotted (maximum) time of 3 hours.
(v) All questions of a particular section must be attempted in the correct
order.
(vi) Section A : Objective Type Questions (30 marks) :
(a) This section has 6 questions.
(b) There is no negative marking.
(c) Do as per the instructions given.
(d) Marks allotted are mentioned against each question/part.
(vii) Section B : Subjective Type Questions (30 marks) :
(a) This section has 18 questions.
(b) A candidate has to do 11 questions.
(c) Do as per the instructions given.
(d) Marks allotted are mentioned against each question/part.

Section A
(Objective Type Questions) (30 Marks)
1. Answer any 4 questions out of the given 6 questions on Employability
Skills. 4 1=4
(i) What do you mean by presentation in a presentation software ?
(ii) What is the shortcut key to print a text ?
(iii) Which of the following is a subtype of emotional personality
disorders ?
(a) Paranoid Personality Disorder
(b) Schizotypal Personality Disorder
(c) Histrionic Personality Disorder
(d) Schizoid Personality Disorder
343 Page 3 of 15 P.T.O.

(iv) -àoaUm ?

(v) _________ EH$ ì¶dgm¶ ¶moOZm {dH${gV H$aZo Am¡a J«mhH$ H$s Amdí¶H$Vm H$mo
nyam H$aZo Am¡a bm^ H$aHo$ Bgo MbmZo H$s EH$
à{H«$¶m h¡ &
(a) CÚ
(b) noem
(c) ì¶mnma
(d) ì¶dgm¶

(vi) CÚ_r
2. {XE JE 7 àíZm| _| go {H$Ýht 5 àíZm| Ho$ CÎma Xr{OE & 5 1=5

(i) ?
(a) qgJb
(b) DC
(c) DC ûm¥§
(d) W«r-
(ii) a H$mo ________ na
h¡ &
(a) H$moB© ^ma Zht (b) nyU© ^ma Ho$ {ZH$Q>
(c) AmYm ^ma (d) AmYm ^ma Ho$ {ZH$Q>
(iii) F = BIL , L B§{JV H$aVm h¡ :
(a) H$a§Q>
(b) H§$S>³Q>a H$s b§~mB©
(c)
(d) ~b
(iv) W«r- :
(a) 0·8 nr. . b¡½g (b) 0·8 nr. . brS²>g
(c) ¶y{ZQ>r nr. . (d) 0·6 nr. . brS²>g
343 Page 4 of 15

(iv) How does self-motivation help us ?

(v) __________ is a process of developing a business plan and running
it using innovation to meet customer needs and make profit.

(a) Entrepreneurship

(b) Profession

(c) Trade

(d) Occupation

(vi) Name one barrier to becoming an entrepreneur.

2. Answer any 5 out of the given 7 questions. 5 1=5

(i) Construction of a universal motor is similar to :
(a) Single phase induction motor
(b) DC shunt motor
(c) DC series motor
(d) Three-phase induction motor

(ii) Power transformers are designed to have maximum efficiency at :
(a) No load (b) Near to full load
(c) Half load (d) Near to half load

(iii) In relation F = BIL, L indicates :
(a) Current
(b) Length of conductor
(c) Flux
(d) Force

(iv) Three-phase induction motor usually operates on :
(a) 0·8 PF lags (b) 0·8 PF leads
(c) Unity PF (d) 0·6 PF leads
343 Page 5 of 15 P.T.O.

(v) B§S>³e :
(a) Vwë`H$m{bH$ ({gÝH«$moZg) J{V na
(b) {dnarV {Xem
(c) Vwë`H$m{bH$ ({gÝH«$moZg) J{V go A{YH$
(d) Vwë`H$m{bH$ ({gÝH«$moZg)
(vi) H$m ³¶m bm^ h¡ ?
(a) H¡$no{gQ>a H$s H$moB© Amdí¶H$Vm Zht
(b) °H©$
(c)
(d)

(vii) `§ÌU H$m à¶moJ {H$¶m OmVm h¡ :
(a) gmYmaU Bbop³Q´>H$ Am¶aZ _| >
(b) ñdMm{bV Bbop³Q´>H$ JrOa _|
(c) _|
(d) _|

3. {XE JE 7 àíZm| _| go {H$Ýht 6 àíZm| Ho$ CÎma Xr{OE & 6 1=6

(i) H$s H$moB© Xmo {d{Y¶m± {b{IE &
(ii) AC ?

(iii) A{WªJ ³¶m| Amdí¶H$ h¡ ?
(iv) D$î_m {b{IE &
(v) AC Zo Ho$ {bE {H$g CnH$aU H$m Cn¶moJ {H$¶m OmVm h¡ ?
(vi) {b{IE {OZH$m Cn¶moJ ^mar ^ma H$mo g§^mbZo Ho$ {bE {H$¶m OmVm
h¡ &
(vii) ?

343 Page 6 of 15

(v) Rotor of induction motor runs always :
(a) At synchronous speed
(b) In opposite direction
(c) More than synchronous speed
(d) Less than synchronous speed

(vi) Advantage of shaded pole motor is :

(a) No need of capacitor
(b) Low starting troque

(c) Low efficiency
(d) Low power factor

(vii) Thermostat is used in :

(a) Ordinary electric iron
(b) Automatic electric geyser
(c) Immersion rod
(d) Room cooler

3. Answer any 6 out of the given 7 questions. 6 1=6

(i) Write any two methods of artificial respiration.

(ii) What do you mean by AC motor ?

(iii) Why is earthing necessary ?

(iv) Name the method of heat transfer in electric iron.

(v) Which instrument is used to measure AC supply voltage ?

(vi) Names the things which are used to handle heavy loads.

(vii) What do you mean by stator ?

343 Page 7 of 15 P.T.O.

4. {XE JE 6 àíZm| _| go {H$Ýht 5 àíZm| Ho$ CÎma Xr{OE & 5 1=5

(i) {H$gr Xr JB© , Vwë¶H$m{bH$ J{V Amny{V© Amd¥{Îm H$m EH$ H$m¶© h¡ &
(ii)
(iii)
(iv) ,
H$aVm h¡ &
(v)
(vi) na Xmo ñWm¶r dmB§{S>§J hmoVr h¢ &
5. {XE JE 6 àíZm| _| go {H$Ýht 5 àíZm| Ho$ CÎma Xr{OE & 5 1=5

[aº$ ñWmZm| H$s nyy{V© H$s{OE &
(i) ¶{X DC , Vmo BgH$m níM {d.dm.~b ________ h¡ &
/KQ>Vm)

(ii) daob Ho$O amoQ>a ___________ àH$ma Ho$ hmoVo h¢ & (Iwbo/~§X)
(iii) _¡Ja H$m Cn¶moJ ____________ /Ymam)

(iv) ________ /

(v) {Og dh h¡ _________ /

(vi) Amn _____ àH$ma Ho$ Am¡Omam| H$m Cn¶moJ H$aZm ng§X H$a|Jo &
(B§gwboQ>oS>/Zm°Z-B§gwboQ>oS>)

6. {XE JE 6 àíZm| _| go {H$Ýht 5 àíZm| Ho$ CÎma Xr{OE & 5 1=5

(i) 100 MVA ?
(a) OFAF
(b) ONAN
(c) OFAN
(d) ONAF

343 Page 8 of 15

4. Answer any 5 out of the given 6 questions. 5 1=5
(True/False)
(i) For a given motor, synchronous speed is a function of supply
frequency.
(ii) The speed of dc shunt motor falls very rapidly with increase in
load.
(iii) Starting torque of capacitor start motor is less.
(iv) In induction motor, the rotor induces voltage, reactance and
frequency all due to slip.
(v) The series motor has approximately constant speed.
(vi) Capacitor start and run motor has two permanent windings on
rotor.

5. Answer any 5 out of the given 6 questions. 5 1=5
Fill in the blanks.
(i) If the speed of DC shunt motor increases, its back emf
____________. (increases/decreases)

(ii) The squirrel cage rotor are _________ types. (open/closed)

(iii) Megger is used to measure __________. (resistance/current)

(iv) The supply is connected to __________ winding of a transformer.
(secondary/primary)

(v) The meter which has high resistance is __________.
(ammeter/voltmeter)

(vi) ___________ types of tools are preferred for use.
(Insolated/Non-insolated).
6. Answer any 5 out of the given 6 questions. 5 1=5

(i) Which cooling is required for 100 MVA transformer ?
(a) OFAF
(b) ONAN
(c) OFAN
(d) ONAF

343 Page 9 of 15 P.T.O.

(ii)
(a) {H$amo{gZ Am°¶b
(b) {g{bH$m Oob
(c) H$moH$moZQ> Am°¶b
(d) do{OQ>o~b Am°¶b
(iii) H¡$no{gQ>a
(a) ho¶a S´>m¶a
(b)
(c) grqbJ
(d)

(iv) {S>J«r hmoVr h¡ ?
(a) 180
(b) 90
(c) 360
(d) 0

(v) AC à{VamoYH$ n[a ?
(a) Amo_ Ho$
(b) boݵO Ho$
(c) \¡$amS>o Ho$
(d) {H$aMm°\$ Ho$
(vi) dmQ> :
(a) AßnmaoÝQ> nmda
(b) Q¯> nmda
(c) [aEop³Q>d nmda
(d) dmQ>bog nmda

343 Page 10 of 15

(ii) Name the liquid used in breather of transformer.
(a) Kerosene oil
(b) Silica gel
(c) Coconut oil
(d) Vegetable oil

(iii) Example of permanent capacitor motor is :
(a) Hair Dryer
(b) Electric Mixer
(c) Ceiling Fan
(d) Drill Machine

(iv) How many electrical degrees are in one cycle ?
(a) 180
(b) 90
(c) 360
(d) 0

(v) On which law does pure resistive circuit in AC work ?
(a)
(b) Lenz law
(c) Faraday law
(d) K law

(vi) The wattmeter measures :
(a) Apparent power
(b) True power
(c) Reactive power
(d) Wattless power

343 Page 11 of 15 P.T.O.

IÊS> I $
(gãOop³Q>d Q>mBn Ho$ àíZ) (30 A§H$)

5 3
20 30 3 2=6

7. EH$ H$m¶©nwpñVH$m (dH©$~wH$) ³¶m h¡ ? {H$gr EH$ ñno«S>erQ> Eo {b{IE &

8. VH$ZrH$s CÚ_r

9. ì¶dgm¶ MbmVo CÚ_r ?

10. ?

11. oB© Xmo bm^ ~VmBE &

5 3 20 30 3 2=6

12. EH$ grar ?

13. ° ?

14. , Vmo H$maU ~VmBE &

15. {H$Ýhr§ Mma E.gr. Ho$

16. {b{IE &

343 Page 12 of 15

Section B
(Subjective Type Questions) (30 Marks)

Answer any 3 questions out of the given 5 questions on Employability Skills.
Answer each question in 20 30 words. 3 2=6

7. What is a workbook ? Name any one spreadsheet application.

8. Write two roles of technical entrepreneurs.

9. What are the problems an entrepreneur may face while running a
business ?

10. How do expensive thoughts motivate us ?

11. Give any two benefits of positive personality.

Answer any 3 out of the given 5 questions in 20 30 words each. 3 2=6

12. What is power factor in a series circuit ?

13. What are the advantages of Auto transformer ?

14. Give the reasons if motor blows out the fuse at the time of starting.

15. Write the name of any four AC single phase motor.

16. Write safety precautions while working on heavy loads.

343 Page 13 of 15 P.T.O.

3 2 30 50 2 3=6

17. ° ? ° o

18.

19. g§

5 3 50 80 3 4=12

20. bo {d{^Þ àH$ma Ho$ Xmofm| H$s ì¶m»¶m H$s{OE &

21. _rQ>a

22. n VmAm| H$s VwbZm H$s{OE &

23. AmaoI H$s ghm¶Vm go Xm~ àH$ma Ho$ {dÚwV Ob JrOa H$s g§aMZm Ed§ H$m¶©{d{Y H$mo

24. DC ? BgHo$ H$m¶©H$mar {gÕm§V Am¡a àH$ma {b{IE &

343 Page 14 of 15

Answer any 2 out of the given 3 questions in 30 50 words each. 2 3=6

17. What are the different types of transformer ? Explain the working of

voltage transformer.

18. With diagram explain the working of split single phase induction motor.

19. With the help of a neat diagram, explain the construction of immersion rod.

Answer any 3 out of the given 5 questions in 50 80 words each. 3 4=12

20. Explain different kinds of faults which may occur in various domestic
appliances.

21. With the help of diagram, explain the working of single phase induction
type energy meter.

22. Compare the characteristics of squirrel cage motor and slip ring induction

motor.

23. With the help of a diagram, explain the construction and working of

pressure-type electric water geyser.

24. What is a DC motor ? Write its working principle and types.

343 Page 15 of 15 P.T.O.