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Q2. (a) Describe in detail a four stroke cycle. Why it is called so? (5)

(b) Draw 4-Stroke engine cycle. With crank position of each stroke. (6)

(c) What is scavenging? Show the Scavenging step in the cycle diagram, what is its importance. (5)

Q3. Describe following terms with respect to Diesel Engine with suitable diagram:
(a) Natural aspiration (4)

(b) Scavenging (4)

(c) Supercharging (4)

(d) Types of Super charging in two stroke engine. (4)

Q3. With respect to Modern 2- Stroke Diesel Engine.

i) What is Electronically controlled engine? Which all functions of main engine are controlled electronically. (8)

ii) How these type of engines are superior to their earlier designs. (8)

Q4. With reference to lubricating oil:

(a) Explain why oil employed in the crankcase of a trunk piston engine differs in its properties

from that employed in the crankcase of a crosshead engine. (6)

(b) List FOUR effects of bacterial attack on crankcase oil.

(c) Explain the action which must be taken if bacterial attack of the crankcase oil is detected. (4)

Q1. (a) Describe the procedure for taking crankshaft deflection of Auxiliary Engine, explaining all precautions that must be observed (8)

(b) Explain what deflection readings actually mean and suggest the action which must be taken should readings be outside values recommended by the engine manufacturer. (8)

Q5.a) State why double walled fuel pipes are employed for high pressure fuel lines. (6)

b) Sketch and describe such a double walled pipe arrangement and show how high-pressure pipe failure is indicated. (10)

Q5. (a) What is the definition of the following terms: (6)
(i) Indicated Power
(ii) Specific fuel oil consumption
(iii) Brake power
(iv) Mechanical efficiency
(v) Thermal efficiency

(b) What is an Indicator diagram of diesel engine? Draw a diagram and show different points related to Diesel Engine power measurement. (6)

Q1. a) What are the safety interlocks provided in compressed air starting system of Main Engine? (8)

b) Sketch and describe the air starting system of Main Engine. (8)

Q9. a) Describe how fuel injector components deteriorate with time? (6)

b) What are effects of deterioration of fuel injector components? (6)

c) What are the signs of a bad injector? (4)