Goa Board Class 12 Question Paper 2025 Auto Electricals

2025 II 24 0930 Seat No.

Time : 2 Hours AUTO ELECTRICALS
Subject Code

V 4 3 7 2
Total No. of Questions : 23 (Printed Pages : 4) Maximum Marks : 50

INSTRUCTIONS : (i) There are four sections in the question paper (A, B,
C and D) consisting of 23 questions.

(ii) In Section A, there are eight questions of which Question
Nos. 1 to 4 are Multiple Choice Questions. Question
Nos. 5 and 6 are to be answered in one word, phrase
or number. Question number 7 and 8 are to be answered
in one sentence each.

(iii) Attempt all the questions. Internal choice is given for
Question Numbers 20 and 23.

(iv) Figures to the right indicate marks allotted to each
question.

(v) Write the number of each question clearly on the answer
book.

Section-A

1. Specific gravity of fully charge battery is ......................... 1

• 1.11

• 1.29

• 2.29

• 1.19

2. Electromagnetic effect is used in ....................... type of regulator. 1

• coil

• electronic

• digital

• electro-thermal

3. Internal short circuit in the motor armature is detected by ............. test. 1

• multimeter

• glow lamp

• growler

• visual

4. Arcing at the CB point of distributor is avoided by ...................... 1

• ignition coil

• CDI unit

• capacitor

• resistor

Name the test used to determine the condition of battery plates. 1

6. Which test is conducted to know the condition of spark plug on running
engine ? 1

7. Name the instrument used to check the gap, in between spark plug electrodes.

1

8. Why is the wind screen washer used in a car ? 1

Section B

Explain the output test conducted on RR unit used in two-wheeler. 2

10. Explain the construction of armature in the generator. 2

11. How is the current produced by the coils in Magneto ? 2

State any four causes and suggest the suitable remedies for following

troubles :

12. High output from alternator. 2

13. Motor continue running after release of starter switch. 2

14. Run down battery. 2

Section-C

15. Explain the construction of two types of stator windings used in an alternator.

3

16. Draw the neat labelled diagram of Bendix drive and state its function. 3

17. Write the procedure to test the can type ignition coil using multimeter. 3

18. Explain the working of any three anti dazzle devices used in headlight. 3

19. Draw the circuit diagram of overdrive solenoid switch and explain its working.

3

20. Explain the construction and working of electric horn. 3

Or

Explain the construction and working of power window. 3

Section D

21. With the help of neat labelled diagram explain the high rate discharge test

conducted on the battery. 4

22. Draw the neat labelled circuit diagram of “balancing coil type oil pressure

gauge” and explain its working. 4

23. With the help of neat labelled diagram explain the setting of ignition timing

in a car by using TDC finder. 4

Or

With the help of neat labelled diagram explain the construction of vacuum

advance mechanism in distributor. 4