DieselShip's Online Content Library

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)

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)

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)

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)

Q6. Explain how leakage of the undermentioned valves may become apparent to watchkeepers and state the effects on engine operation. Describe the immediate and subsequent action Which might be necessary in each case.
(a) Exhaust valve
(b) Fuel valve
(c) Air Starting valve

Q7. Make a report to the Chief Engineer of your vessel about malfunctioning of low lub oil pressure alarm for the auxiliary engine, observed during your watch, with special emphasis on the possible consequences. (16)

Q8. (a) Describe crank case Oil Mist Detector and the principle of its operation. (8)
(b) Draw crank case explosion relief door and name the parts. State pressure setting of the door. (8)

Q9. With reference to an auxiliary diesel engine:
(a) Explain how a crankcase explosion may occur (4)
(b) Identify the indications of poor combustion (4)

(c) State FOUR reasons for poor combustion (4)

(d) Describe the effects on engine condition and maintenance by allowing poor combustion to continue (4)