Goa Board Class 12 Question Paper Mar 2018 Automobile Engineering II _New Pattern_

*V322* 2018 III 14 1000 Seat No. : Time : 2 Hours AUTOMOBILE ENGINEERING – II (New Pattern) Subject Code V 3 2 2 Total No. of Questions : 5 (Printed Pages : 2) Maximum Marks : 50 INSTRUCTIONS : i) Answer each question on a fresh page. ii) Write the number of each question and sub-questions clearly. iii) All questions are compulsory. iv) Figures to the right indicate full marks. v) Illustrate your answers with neat labelled diagrams wherever necessary. 1. A) Answer the following questions in one sentence each : i) What is the purpose of hand priming pump provided at suction side of fuel feed pump. [1] ii) Define the term ‘Phasing’ of inline fuel injection pump. [1] iii) What are the constituents of Compressed Natural Gas (CNG) ? [1] iv) Name the components of Liquefied Petroleum Gas (LPG) fuel system. [1] v) Why antifreeze solution added to the coolant ? [1] vi) Which liquids are usually used in the bellows type thermostat valve ? [1] B) Draw neat labelled diagram of Mechanical Fuel Pump used in petrol car and explain its working. [4] 2. A) Answer the following questions : i) Explain ‘Venturi effects’ in simple carburettor. [2] ii) List down any four requirements of Diesel engine fuel injection system. [2] iii) State any four advantages of Petrol Engine Fuel injection system over carburettor system. [2] B) Explain the construction of individual pump system in diesel engine with help of neat line labelled sketch. [4] V-322 -1- P.T.O.

*V322* 3. A) Answer the following questions : i) Explain the use of following sensor in electronic fuel injection system : a) Oxygen [1] b) Throttle position. [1] ii) Write the function of the following parts in-corporated in Petrol Engine injection system : a) Pumping element [1] b) Metering element. [1] iii) State any four advantages of Liquid Petroleum Gas (LPG). [2] B) Explain construction and working of crescent type oil pump. [4] 4. A) Answer the following questions : i) State any four functions of lubricating oil. [2] ii) Write short note on ‘Oil Cooler’. [2] iii) Explain ‘Thermosyphon’ water cooling method. [2] B) Draw neat labelled line diagram of Automobile Airconditioning system and explain its working. [4] 5. A) Answer the following questions : i) Write the difference between water and Air Cooling method. [2] ii) Name any four pollutants emitted by diesel engine. [2] iii) Write short note on Flame (Halide) leak detector. [2] B) Explain construction and working of three way catalytic converter used in Automobile to control exhaust emission. [4] _____________ V-322 -2-