Goa Board Class 12 Question Paper Mar 2019 Auto Transmission

2019 III 05 1000 Seat No.

Time : 2 Hours AUTO TRANSMISSION
Subject Code

V 3 2 3
Total No. of Questions : 5 (Printed Pages : 3) Maximum Marks : 50

INSTRUCTIONS : (i) All questions are compulsory.

(ii) Answer each question on a fresh page.

(iii) Write the number of questions and subquestions

clearly.

(iv) Figures to the right indicate full marks.

1. (A) Answer the following questions in one sentence each :

(i) State any two advantages of Diaphragm clutch. 1

(ii) Name the components of final drive. 1

(iii) What is the purpose of breakers in Tyres ? 1

(iv) Why are shock absorbers used in suspension system ? 1

(v) Name the type of stub axle more popularly used in heavy duty

vehicles. 1

(vi) What is camber angle ? 1

(B) Explain the constructional details of multiplate clutch with a neat

labelled sketch. 2+2

2. (A) Answer the following questions in short :

(i) State any four good qualities the clutch plate should possess. 2

(ii) Define the term ‘‘Gradient Resistance’’. 2

(iii) Explain in brief the Torque converter of an automobile. 2

(B) Draw a neat labelled diagram of differential unit and explain its

working. 2+2

3. (A) Answer the following questions in short :

(i) State any four functions of a Gear Box. 2

(ii) Compare Hotchkiss drive with Torque tube drive. (any four

points) 2

(iii) What are the functions of propeller shaft ? (any four) 2

(B) Draw a neat labelled sketch of ‘Wishbone type’ independent suspension

system and explain its constructional details. 2+2

4. (A) Answer the following questions in short :

(i) List out any four requirements of a Road wheel. 2

(ii) State the various resistances which will be resisted by the following

frame sections :

(a) Channel section 1

(b) Tubular section 1

(iii) State any four functions of a frame of an automobile. 2

(B) Explain the working of worm and roller steering gear box with a neat

labelled sketch. 2+2

5. (A) Answer the following questions in short :

(i) Give the characteristics of suspension system. (any four) 2

(ii) What is oversteer and understeer ? 2

(iii) Explain the unloader valve and brake valve used in Air braking

system. 2

(B) Draw a neat labelled diagram of Disc brakes and explain its

constructional details. 2+2