TN 12th Question Paper 2022 Basic Electrical Engineering

No. of Printed Pages : 8
5982
!5982BasicElectEnginee! £vÄ Gs
Register Number

Part III — Vocational Subjects
Ai¨£øh ªß ö£õÔ°¯À & P¸zv¯À
BASIC ELECTRICAL ENGINEERING - THEORY
( uªÌ ©ØÖ® B[Q» ÁÈ / Tamil & English Version )

Põ» AÍÄ : 3.00 ©o ÷|µ® ] [ ö©õzu ©v¨ö£sPÒ : 90
Time Allowed : 3.00 Hours ] [ Maximum Marks : 90

AÔÄøµPÒ : (1) AøÚzx ÂÚõUPЮ \›¯õP £vÁõQ EÒÍuõ GߣuøÚ \›£õºzxU
öPõÒÍÄ®. Aa_¨£v¨¤À SøÓ°¸¨¤ß AøÓU PsPõo¨£õÍ›h®
EhÚi¯õPz öu›ÂUPÄ®.
(2) }»® AÀ»x P¸¨¦ ø©°øÚ ©mk÷© GÊxÁuØS®
AiU÷PõikÁuØS® £¯ß£kzu ÷Ásk®. £h[PÒ ÁøµÁuØS
ö£ß]À £¯ß£kzuÄ®.
Instructions : (1) Check the question paper for fairness of printing. If there is any lack of
fairness, inform the Hall Supervisor immediately.
(2) Use Blue or Black ink to write and underline and pencil to draw
diagrams.

£Sv & I / PART - I

SÔ¨¦ : (i) AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. 15x1=15

(ii) öPõkUP¨£mkÒÍ ©õØÖ ÂøhPÎÀ ªPÄ® Hئøh¯ Âøhø¯z
÷uº¢öukzxU SÔ±mkhß Âøh°øÚ²® ÷\ºzx GÊuÄ®.
Note : (i) Answer all the questions.
(ii) Choose the most appropriate answer from the given four alternatives
and write the option code and the corresponding answer.

5982 2

1. ÷\õ-i-¯® B ÂÍUS JÎ-°ß {Ó-©õ-Úx __________.
(A) }»® P»¢u £a-ø\ (B) ]-Á¨-¦
(C) ©g-\Ò (D) £a-ø\
The colour of sodium vapour discharge lamp is __________.
(a) Bluish green (b) Red
(c) Yellow (d) Green

2. |À-» ªß-Põ¨¦ ö£õ-¸Ò-P-ÐU-PõÚ Sn[-PÒ __________.
(i) ~sx-øÍ-PÒ öPõs-h-uõP C¸UP ÷Ás-k®
(ii) Av-P ªß-Põ¨¦ Á¼-ø©
(iii) SøÓ¢u ªß-Põ¨¦ ªß-u-øh
(A) (i) ©Ø-Ö® (iii) ©mk® (B) (ii) ©Ø-Ö® (iii) ©m-k®
(C) (i), (ii) ©ØÖ® (iii) (D) (ii) ©m-k®
The properties of Insulator :
(i) are porous
(ii) high dielectric strength
(iii) low insulation resistance
(a) (i) and (iii) only (b) (ii) and (iii) only
(c) (i), (ii) and (iii) (d) (ii) only

3. ªÎ-µU-T-i¯ SÇÀ ÂÍU-Qß J뼀 vÓß ÂQ-u® Gß-£x __________.
(A) 40 ¿©ß-PÒ/Áõm (B) 10 ¿©ß-PÒ/Áõm
(C) 60 ¿©ß-PÒ/Áõm (D) 20 ¿©ß-PÒ/Áõm
Luminous efficacy of a fluorescent lamp is __________.
(a) 40 lumens/watt (b) 10 lumens/watt
(c) 60 lumens/watt (d) 20 lumens/watt

4. öÁ¨£U P®-¤a _¸Ò G¢u E÷»õ-Pz-uõÀ BÚ-x ?
(A) A¾-ª-Û-¯® (B) ¤z-u-øÍ (C) ö\®-¦ (D) ø|U-÷µõ®
The heating element is made up of :
(a) Aluminium (b) Brass (c) Copper (d) Nichrome

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5. __________ Âv¨-£i öÁ¨-£a \õ-u-Ú[-PÒ ö\¯À-£-k-Q-Ó-x.

(A) ªß-÷Úõmh Âv (B) K®ì Âv
(C) ªß-Ú-Êzu Âv (D) BØ-ÓÀ ©õ-ÓõU ÷Põm-£õ-k
Under which law, the heating appliances are functioning ?
(a) Current Law (b) Ohm’s Law
(c) Voltage Law (d) Law of Conservation of energy

6. xøÁU- S ® C¯¢- v - µ z- v À x- ø ÁU- P ¨- £ mh xo- P - Î À EÒÍ \»- ø Áz- y øÍ
öÁÎ-÷¯Ø-Ö® ö\¯À-£õk öPõs-h-x.
(A) E»ºz-x® _Ø-Ö (B) xøÁU-S® _Ø-Ö
(C) öÁÎ-÷¯Ø-Ö® _Ø-Ö (D) A»-_® _Ø-Ö
In which function the soap powder is removed from the clothes in washing
machine ?
(a) Dryer function (b) Washing function
(c) Exhaust function (d) Rinsing function

7. Av-÷ÁP Cµ-°À-PÒ ©oU-S __________ Q÷»õ «m-hº- ÷ÁPz-vÀ C¯[-S®.
(A) 400 (B) 200 (C) 800 (D) 600
Very high speed train runs at a speed of __________ km/hours.
(a) 400 (b) 200 (c) 800 (d) 600

8. ö£õ-x-ÁõP C¯[-S C¸®¦ ÁøP P¸-Â-PÒ __________ ö£õ-¸z-u-©õ-Ú-x.
(A) i.]/-H.]. AÍ-Ã-k-P-ÐU-S
(B) i.]. AÍ-Ã-k-P-ÐUS ©m-k®
(C) ªß-uøh AÍ-Ã-k-P-ÐU-S
(D) H.]. AÍ-Ã-k-P-ÐUS ©m-k®
The moving iron type instruments are suitable for __________.
(a) DC/AC measurements
(b) DC measurements only
(c) Resistance measurement
(d) AC measurements only

5982 4

9. hõ[ öhì-hº&I £¯ß-£-kz-x-Á-uß ÷|õU-P® :
(A) xÀ-¼-¯-©õÚ ªß BØ-Óø» AÍ-Â-h
(B) ªß-\õ-µzøu xs-iU-Põ-©À ªß-÷Úõm-hzøu AÍ-Â-h
(C) xÀ-¼-¯-©õÚ ªß uøhø¯ AÍ-Â-h
(D) xÀ-¼-¯-©õÚ ªß AÍ-Ä-PøÍ Põm-k®
The use of tong tester is __________.
(a) for accurate measurement of energy
(b) to measure current in a line without breaking the circuit
(c) for accurate measurement of resistance
(d) for accurate measurement of electrical quantities

10. BØ-ÓÀ ©õØ-Ô-¯õ-Úx ÁøP¨-£-kz-u¨-£-k® Âu® __________.
(A) ªß ÷uU-Qø¯ ©m-k® ö£õ-¸z-x
(B) ªß-u-øhø¯ ©m-k® ö£õ-¸z-x
(C) ªß uøh, ªß ysi ©Ø-Ö® ªß ÷uU-Q-ø¯¨ ö£õ-¸z-x
(D) ªß ys-iø¯ ©m-k® ö£õ-¸z-x
Transducers are classified according to __________.
(a) Capacitance only
(b) Resistance only
(c) Resistance, Inductance and Capacitance
(d) Inductance only

11. ‰ßÖ •øÚ xÁUQ G¢u ÷|ºz-vø\ ªß-÷Úõ-i-P-ÎÀ £¯ß-£-kz-u¨-£-k-Q-Óx ?
(A) Cøn ©Ø-Ö® Tmk ªß-÷Úõ-i
(B) Cøn ªß-÷Úõ-i
(C) öuõ-hº ªß-÷Úõ-i
(D) Tmk ªß-÷Úõ-i
In which DC motor, the three point starter is used ?
(a) Shunt and Compound motor
(b) Shunt motor
(c) Series motor
(d) Compound motor

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12. ÷|º vø\ ªß-÷Ú-õi-P-Îß xÁU-Pz-vß ÷£õx ªß-Ú-Pz-vß ÷ÁP® __________
C¸U-S®.
(A) Av-P-©õP (B) §ä-â¯-©õP
(C) ªP- Av-P©õP (D) SøÓ-ÁõP
When the DC motor is in starting position, the speed of the Armature _________.
(a) High (b) Zero
(c) Very high (d) Low

13. x¸-Á Cøhz-y-µ® Gß-£x :
(A) J¸ x¸-Áz-vÀ EÒÍ J¸ {ø»U-PõÚ £ÒÍ[-P-Îß Gs-oU-øP
(B) J¸ x¸-Áz-vØ-PõÚ £ÒÍ[-P-Îß Gs-oU-øP
(C) £ÒÍ[-P-Îß £õv Gs-oU-øP
(D) J¸ {ø»U-PõÚ £ÒÍ[-P-Îß Gs-oU-øP
Pole pitch is referred to as :
(a) The number of slots per pole per phase
(b) The number of slots per pole
(c) Half of the number of slots
(d) The number of slots per phase

14. ªß-÷Úõ-i-¯õ-Úx ªß BØ-Ó-ø» __________ BØ-Ó-»õP ©õØ-Ö-Q-Ó-x.
(A) öÁ¨-£ (B) ªß (C) Põ¢-u (D) C¯U-P
In Motor, Electrical energy is converted into __________ energy.
(a) Heat (b) Electrical (c) Magnetic (d) Mechanical

15. ªß-÷Úõ-iø¯ £-¯ß-£-kz-x® ÷£õx __________ US J¸-•øÓ E¯-Ĩ-£ø\ ©õØÓ
÷Ás-k®.
(A) 2 Á¸-h[-PÒ (B) 6 ©õ-u[-PÒ (C) 3 ©õ-u[-PÒ (D) 1 Á¸-h®
The lubrication applied to an electric machine is to be changed once in __________.
(a) two years (b) six months (c) three months (d) a year

5982 6

£Sv & II / PART - II
SÔ¨¦ : GøÁ÷¯-Ý® £z-x ÂÚõUPÐUS _¸U-P-©õ-P Âøh¯ÎUPÄ®. ÂÚõ Gs
10x3=30
28 &US Pmhõ¯©õ-P Âøh¯ÎzuÀ ÷Ás-k®.
Note : Answer any ten questions briefly. Question No. 28 is compulsory.
16. vs-©U ÷Põ-n® – Áøµ-¯-ÖU-P-Ä®.
Define solid angle.

17. JÎ-³m-h-z-vß C¸ Âv-P-øÍU TÖ-P.
State the two laws of illuminations.

18. ªß ÷u´¨-¦¨ ö£m-i-°ß ÁøP-P-øÍU TÖ-P.
List out the types of electrical iron box.

19. ÷©ø\ ªß Â]-Ô-°ß ÷ÁP® GÆ-ÁõÖ ©õØ-Ó¨-£-k-Q-Óx ?
How the speed of the table fan can be changed ?

20. ªß xo öÁШ-£õ-ÛÀ öÁ¢-}º Hß £¯ß-£-kz-u¨-£-k-Q-Óx ?
Why hot water is used in the washing machine ?

21. ÷|º-vø\ ªß-Û-¯UQ – Áøµ-¯-ÖU-P-Ä®.
Define D.C. electric drive.

22. J¸ C¯[-Sa _¸Ò {ø»zu Põ¢u ÁøPU P¸-Âø¯ ªß-Ú-Êz-u-©õ-Û-¯õP GÆ-ÁõÖ
©õØ-Ö-Áõ´ ?
How will you convert a Permanent Magnet moving coil instrument into a voltmeter ?

23. v›-¦ AÍ-Ä-©õÛ £ØÔ SÔ¨¦ Áøµ-P.-
Write short notes on strain gauge transducer.

24. xÁU-Q-P-Îß Cµsk Ai¨-£øh ÷Áø»-PøÍU TÖ-P.
What are the two basic functions of starter ?

25. ©i¨¦ ÁøP EÀø» Gß-ÓõÀ GßÚ ?
What is lap winding ?

7 5982

26. uk¨¦ £µõ-©-›¨¦ Gß-ÓõÀ GßÚ ?
What is meant by preventive maintenance ?

27. •øÚ Aø\Ä Gß-ÓõÀ GßÚ ?
What is meant by end play ?

28. |À» ªß-Põ¨-¦¨ ö£õ-¸m-P-ÐU-PõÚ 3 Sn[-PøÍ GÊ-x-P.
Write any three properties of a good insulator.

£Sv & III / PART - III
SÔ¨¦ : GøÁ÷¯-Ý® I¢-x ÂÚõUPÐUS ©m-k® Âøh¯ÎUPÄ®. ÂÚõ Gs 35&US
Pmhõ¯©õ-P Âøh¯ÎUPÄ®. 5x5=25
Note : Answer any five questions. Question No. 35 is Compulsory.

29. §mk ÁøP ªß-Põ¨-£õ-Ûß £h® Áøµ¢x £õ-P[-PøÍU SÔU-P-Ä®.
Draw a neat sketch of shackle type insulator and mention its parts.

30. öÁÎ- ÷ ¯Ø- Ö ® ªß Â]Ô Gß- Ó õÀ GßÚ ? Ax C¯[- S ® Âu® ©Ø- Ö ®
E£-÷¯õ-P[-PøÍ ÂÍU-S-P.
What is Exhaust fan ? Explain the working principle of the exhaust fan and state
its uses.

31. SÊ ªß-Û-¯UQ Gß-ÓõÀ GßÚ ?
What is electric group drive ?

32. C¯[S C¸®¦ ªß AÍ-øÁU P¸-Â-PøÍ ÂÁ-›U-P-Ä®.
Explain about moving iron instruments.

33. |õßS •øÚ xÁU-Q-°ß £hzøu Áøµ-P.
Draw the circuit diagram of four point starter.

34. ªß C¯¢-v-µ[-P-ÎÀ ö\´-¯¨-£-k® B´-Ä-PøÍ ÂÍU-S-P.
Explain the various tests conducted in electrical machines.

35. AÊz-u-ªÀ-»õ ÁøP }º `-÷hØ-Ö® P»-Ûß £h® Áøµ¢x £õ-P[-PøÍU SÔU-P-Ä®.
Draw the neat sketch of Non Pressure type Geyser and mention its various parts.

5982 8

£Sv & IV / PART - IV
SÔ¨¦ : AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. ÷uøÁ-¯õÚ Ch[-P-ÎÀ £h®
Áøµ-P. 2x10=20

Note : Answer all the following questions. Draw diagrams wherever necessary.

36. (A) ÷©Ûø» ªß öuõ- h - ¸ U- S ®, {»z- u i ªß- Á - h z- v Ø- S ® Cøh- ÷ ¯ EÒÍ
÷ÁÖ-£õ-k-P-øÍ Am-h-Á-øn¨-£-kz-x-P.
AÀ»x
(B) }µõ ªß ÷u´¨- ¦ ¨ ö£m- i - ° À Es- h õ- S ® SøÓ- £ õk, Põ- µ - n ® ©Ø- Ö ®
{Áºzv ö\´-uø» Am-h-Á-øn¨-£-kz-x-P.
(a) Tabulate the differences between overhead transmission lines and
underground cables.
OR
(b) Tabulate the defects, reasons and remedial measures of an electric steam
iron box.

37. (A) ÷©Ø-¦-Óz vÓ¨-¦ÒÍ \»-øÁ C¯¢-v-µz-vß Aø©¨¦, ö\¯À-£-k® Âuz-øu¨
£hz-x-hß ÂÁ-›U-P-Ä®.
AÀ»x
(B) 2 x-¸-Á®, 6 £ÒÍ[-PÒ ©Ø-Ö® 6 vø\ ©õØÔ £S-v-PÒ öPõs-h ÷|º-vø\
C-¯¢-v-µz-vØ-PõÚ JØ-øÓ¨-£õøu Aø» ÁøP EÀø» Áøµ-£-h® Áøµ-P.
öuõ-k-Â-PÒ Aø©-Â-hz-øu-²® SÔU-P-Ä®.
(a) Explain the construction and working principle of top loading washing
machine.
OR
(b) Draw the double layer Simplex Wave Winding diagram for a DC machine
having 2 poles, 6 slots and 6 commutator segments. Also mention the brush
positions.

-oOo-