Goa Board Class 12 Question Paper Mar 2019 Automobile Engineering II

2019 III 09 1000 Seat No.

Time : 2 Hours AUTOMOBILE ENGINEERING-II

Subject Code

V 3 2 2

Total No. Of Questions : 5 (Printed Pages : 4) Maximum Marks : 50

INSTRUCTIONS : (i) Answer each question on a fresh page.

(ii) Write the number of each question and sub-question

clearly.

(iii) All questions are compulsory.

(iv) Figures to the right indicate full marks.

(v) Illustrate your answer with neat labelled diagrams

wherever necessary.

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

(i) What is the use of a vent in two wheeler petrol tank ? 1

(ii) How is the oil pressure at delivery in a gear pump

controlled ? 1

(iii) What does the air supply system of a diesel engine

consist of ? 1

[V–322] 1 P.T.O.

(iv) How is the idling speed adjusted in a simple carburettor ? 1

(v) What is the purpose of an atomiser in a diesel engine ? 1

(vi) Why are viscosity index improvers added to lubricating

oils ? 1

(B) Explain the construction and working of an electronic petrol injection

system. 4

2. (A) Answer the following questions :

(i) Explain the working of a CNG fuel system. 2

(ii) State the functions of the following parts in an air cooling

(a) Fins 1

(b) Fan 1

(iii) Name any four diseases caused due to automobile exhaust

emissions. 2

(B) Draw a neat labelled diagram of an electronic leak detector and explain

how it is used to detect refrigerant leakages in an automobile air-

conditioning system. 4

3. (A) Answer the following questions :

(i) Explain the working of an oil pressure warning light. 2

[V–322] 2

(ii) State the four advantages of an electrical fuel pump. 2

(iii) Write the functions of the following parts used in LPG fuel

(a) Converter-regulator 1

(b) Tank. 1

(B) With a neat labelled line diagram of a common rail diesel injection

system, explain its working. 4

4. (A) Answer the following questions :

(i) State any four points of comparison between petrol injection

system and carburettor system. 2

(ii) Explain the working of a pressure cap used in the radiator of

the water cooling system. 2

(iii) State one function each of the following components used in an

automobile air-conditioning system :

(a) Compressor 1

(b) Evaporator. 1

(B) (i) Draw a neat labelled sketch of a plunger type lubricating

pump. 2

(ii) State any four advantages of synthetic lubricants. 2

[V–322] 3 P.T.O.

5. (A) Answer the following questions :

(i) State any four points on the maintenance of diesel injection

system. 2

(ii) Explain the process of air-cleaning in a heavy duty type air

cleaner. 2

(iii) Name any four parts of a forced circulation type of water cooling

system. 2

(B) Explain the construction and working of a charcoal canister. 4

[V–322] 4