DieselShip's Online Content Library

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)

Q2. a) What is Indicator diagram of a 2-Stroke engine. (4)

b) Draw an indicator diagram, mark each step of the cycle in the diagram. (6)

c) What is mean Effective Pressure and how its value is obtained from indicator diagram. (6)

Q3. a) What is crankshaft misalignment? (4)

b) What are the reasons for crankshaft misalignment? (8)

c) What is the effect on main engine of such misalignment. (4)

Q4. a) What is function of guide shoe in a 2-Stoke diesel engine? (4)

b) Draw diagrammatic sketch of guide shoe, naming each part. (8)

c) Describe how guide shoes are lubricated. (4)

Q5.a) In Jerk type Fuel Pump, describe with diagrammatic sketch how metered quantity of fuel oil is delivered to cylinder unit? (8)

b) How is fuel injection timing changed in Jerk type Fuel pump? (4)

c) Describe effect of fuel injection time alteration on the performance of unit. (4)

Q6.a) Describe VIT of any 2-stroke marine diesel engine by Diagrammatic sketch, naming each component and its function. (8)

b) Describe following

i) What is Effective stroke and Idle stroke of a Fuel Pump? (2)

ii) What is fuel pump lead? (2)

iii) What is Super VIT? (2)

iv) What is breakpoint for VIT? (2)

Q7. a) Draw a diagrammatic sketch of the Fuel Oil system used in an Electronic type of engine. (8)

b) Describe how fuel injection to unit is carried out. (4)

c) How Fuel injection timing is obtained? (2)

d) Why fuel injection timing is precise in this system? (2)

Q8. a) How is shaft power obtained from Torque measurement? (4)

b) What is procedure for measuring Torque on propulsion shaft? (4)

c) Drawing a diagrammatic sketch describe the working of a strain Gauge Torsionmeter. (8)

Q9. a) Draw a simple sketch of turbocharger, describing each component. (8)

b) Describe how compressed air is delivered by the turbocharger to main engine? (4)

c) What arrangement is provided on turbocharged 2-stroke main diesel engine to provide compressed air while starting of main engine. (4)