Goa Board Class 12 Question Paper June 2018 Automobile Engineering II

*V322* 2018 VI 11 1430 Seat No. : Time : 2 Hours AUTOMOBILE ENGINEERING – II Subject Code V 3 2 2 Total No. of Questions : 5 (Printed Pages : 2) Maximum Marks : 50 INSTRUCTIONS : 1) All the questions are compulsory. 2) Answer each question on a fresh page. 3) Figures to the right indicate full marks. 4) Illustrate your answer with neat labelled diagrams wherever necessary. 5) Write the numbers of questions and sub-questions clearly. 1. A) Answer the following questions in one sentence : i) Why are baffle plates provided in the fuel tank ? [1] ii) How is the automobile air-conditioning compressor engaged with the engine ? [1] iii) What is the function of a fuel feed pump used in the diesel fuel supply system ? [1] iv) State any two advantages of an electrical fuel pump. [1] v) How is the turbine of a turbo charger driven ? [1] vi) Why is a condenser used in an automobile air conditioning system ? [1] B) Explain the construction and working of a rotor pump used in the lubrication system. [4] 2. A) Answer the following questions : i) Explain the working of the positive crank case ventilation system. [2] ii) List any four types of petrol engine fuel feed systems. [2] iii) Describe the constructional features of a catalytic converter. [2] B) i) Draw a neat labelled diagram of a wax type thermostat value. [2] ii) State any four requirements of anti-freeze solutions. [2] V-322 -1- P.T.O.

*V322* 3. A) Answer the following questions : i) Write a short note on the working of LPG fuel system. [2] ii) What do the following flame colours indicate in a flame leak detector used in testing of refrigerant in the air conditioning system. a) Bright yellow flame. [1] b) Violet flame. [1] iii) Explain the working of a simple carburettor. [2] B) Write the construction and working of vapour recovery system used to minimise emissions. [4] 4. A) Answer the following questions : i) Explain the working of an automobile air-conditioning system. [2] ii) State any four characteristics of CNG. [2] iii) Give any four points of comparison between MPFI and carburettor fuel systems. [2] B) With a neat labelled sketch, explain the working of a pneumatic governor. [4] 5. A) Answer the following questions : i) State the four requirements of diesel fuel injection system. [2] ii) Define : a) Viscosity of a lubricating oil. [1] b) Flash point of a lubricating oil. [1] iii) Explain the necessity of a thermostat valve in the water cooling system. [2] B) i) Write any four disadvantages of petrol injection system. [2] ii) Draw a neat labelled sketch of multi-point port injection system. [2] ___________________ V-322 -2-