Goa Board Class 12 Question Paper June 2018 Auto Electricals

*V372* 2018 VI 13 1430 Seat No. : Time : 2 Hours AUTO ELECTRICALS Subject Code ! % 8 Total No. of Questions : 5 (Printed Pages : 2) Maximum Marks : 50 INSTRUCTIONS : 1) Answer each question on a fresh page. 2) Write the main question numbers and sub-questions clearly. 3) Figures to the right indicate full marks. 4) All questions are compulsory. 5) Illustrate your answers with neat labelled diagram wherever necessary. 1. A) Answer the following questions in one sentence only. 1) What is the meaning of battery capacity ? [1] 2) Why it is necessary to do cadmium tip test in battery ? [1] 3) What is the function of heat sink used in alternator ? [1] 4) What is the meaning of ‘regulation of current’ in charging system ? [1] 5) What is the characteristic of hot type spark plug ? [1] 6) Write any one cause for pitting of contact breaker point. [1] B) Draw the neat labelled diagram of Magneto. State any four functions of it. [4] 2. A) Answer the following questions. 1) Write procedure to charge the battery by using constant voltage charging method. [2] 2) Write the working of coil type voltage regulator used in a generator. [2] 3) List down any four wire colour codes used in electric assessories. [2] B) Explain the procedure to test the following parts of alternator. a) Rotor winding with Ohm-meter. [2] b) Brushes by visual inspection. [2] V-372 -1- P.T.O.

*V216* 3. A) State any four causes and suggest suitable remedies for the given troubles. 1) Sulphation of battery [2] 2) Intermittent output of magneto [2] 3) Knocking of scooter engine. [2] B) Write construction and working of battery coil ignition system used in car. [4] 4. A) Answer the following questions. 1) Draw the neat labelled diagram to show internal details of condenser. [2] 2) Write working of Tell-tale relay. [2] 3) Draw the neat labelled diagram of over running clutch type drive. [2] B) Write procedure to do the following servicing in starter motor armature. a) Turning down of commutator. [2] b) Under cutting of mica. [2] 5. A) Answer the following questions. 1) Write the construction of wind screen defroster. [2] 2) Write the working of electric horn. [2] 3) Write the construction of wind shield washer unit. [2] B) Draw the neat labelled diagram of Headlight circuit and side light circuit used in four wheeler. [4] –––––––––– V-372 -2-