Goa Board Class 12 Question Paper 2025 Auto - Transmission

2025 II 17 0930 Seat No.

Time : 2 Hours AUTO TRANSMISSION
Subject Code

V 4 3 2 3

Total No. of Questions : 23 (Printed Pages : 4) Maximum Marks : 50

INSTRUCTIONS : (i) There are four sections in the question paper (A, B,
C & 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 & 6 are to be answered in one word, phrase or
number and Question Nos. 7 & 8 are to be answered
in one sentence each.

(iii) Attempt all the questions however internal choice is
given for Question Nos. 20 & 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. The gear which gives drive to the half shaft is called as .................. . 1

• Bevel pinion

• Sun gear

• Planet gear

• Crown wheel

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2. The Air bag propellant unit contains ................................... . 1

• sodium azide and potassium nitrate

• electrolyte and iron oxide

• compressed air and nitrogen

• carbon monoxide and nitrogen oxide

3. In order to cover more distance by outer wheel than inner wheel while taking

turn, four wheelers are provided with ................................ . 1

• gearbox

• transfer box

• overdrive

• differential

4. The angle between the vertical line and the king pin central line in the plane

of the wheel, when viewed from the side is called ............................. . 1

• Caster angle

• Camber angle

• Toe-in

• Toe-out

5. Name any one type of clutch that is used in two wheelers. 1

6. How many master cylinders are used in car braking system ? 1

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7. Define Radial ply tyre. 1

8. Differentiate between Hotch kiss drive and Torque tube drive. (Write any one

point.) 1

SECTION B

9. Give any four advantages of synchromesh gearbox. 2

10. List any four functions of gearbox. 2

11. List down any four components of single plate diaphragm clutch. 2

12. Define the following : 2

(a) Wind Resistance

(b) Rolling Resistance.

13. Explain the construction of Tubeless tyre. 2

14. State any two properties of hydraulic fluid used in hydraulic braking

system. 2

SECTION C

15. Write four functions of the propeller shaft. Also give reason for using only

one shackle in hotch kiss drive. 3

16. Draw a neat labelled diagram of Differential and state any two functions

of it. 3

17. What do you mean by bleeding of hydraulic system ? Draw a neat labelled

diagram of Wheel cylinder. 3

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18. Explain the construction and working of Rack and Pinion steering

system. 3

19. Write any three advantages of each of the following : 3

(a) Placement of engine at the front

(b) Placement of engine at the rear.

20. Distinguish between front independent suspension system and rear

conventional suspension system. (Write any six points.) 3

Or

Explain any three types of leaf springs.

SECTION D

21. Draw a neat labelled diagram of Single plate diaphragm clutch and state

any four requirements of clutch. 4

22. Explain the construction of Worm and Roller steering gear box with a neat

labelled diagram. 4

23. With a neat labelled diagram explain the construction of Wish bone suspension

system. 4

Or

Write a short note on construction of conventional leaf spring suspension system

and draw a neat labelled diagram of it.

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