Goa Board Class 12 Question Paper June 2019 Auto Electicals

2019 VI 13 1430 Seat No.

Time : 2 Hours AUTO ELECTRICALS
Subject Code

V 3 7 2
Total No. of Questions : 5 (Printed Pages : 3) Maximum Marks : 50

INSTRUCTIONS : (i) Answer each questions on fresh page.

(ii) Write the main question numbers and sub question

numbers clearly.

(iii) Figures to the right indicate full marks.

(iv) All questions are compulsory.

(v) Illustrate your answers with neat labelled diagram

wherever necessary.

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

(1) What is the function of seperator in lead acid Battery ? 1

(2) Mention the two types of Alternator stator winding connections.1

(3) Define the term ‘Rectification of current.’ 1

(4) Which test is conducted on lead acid battery to know the density

of battery electrolyte ? 1

(5) Name the component in the ignition system used to Develop High

Voltage. 1

(6) Mention any two specifications of a spark plug. 1

(B) With a neat labelled diagram explain the ‘High Discharge test’ of lead
acid battery. 4

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

(1) State the constructional details of a two wheeler magneto, used
for battery charging. 2

(2) Give any four precautions to be followed while working on vehicle,
fitted with an alternator. 2

(3) Explain the working of electronic regulator used in charging system
of a car. 2

(B) With a neat labelled diagram explain the growler test conducted on
motor armature. 4

3. (A) Suggest any four causes and its remedies for the following troubles :

(1) ‘Noisy Alternator’. 2

(2) ‘Starter operates but do not crank the engine’. 2

(3) ‘Weak or no spark in battery ignition system.’ 2

(B) With a neat labelled circuit diagram, explain the working of ‘Electronic
Magneto Ignition System’. 4

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

(1) How does a Armature of D.C. Generator functions in charging
system vehicle ? 2

(2) Explain the construction of flexible cable rack type wind shield
wiper. 2

(3) How does the ‘power windows’ function in an automobile ? 2

(B) With a neat labelled diagram explain the functioing of ‘Balancing coil
type of fuel gauge’. 4

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

(1) How will you test the magneto circuit for proper D.C. out put ? 2

(2) Explain the construction and function of current limit relay. 2

(3) State any four advantages of Electronic Battery ignition system

over conventional type. 2

(B) With a neat labelled diagram explain the procedure to adjust the

headlights of a car. 4